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0801.2461 | c | we have introduced quadratic form expansions , and developed techniques which suggest that they may be useful for synthesizing efficient implementations for unitary operations . we described conditions under which implementations may be efficiently found for unitaries specified by quadratic form expansions ; and we sho... | we introduce techniques to analyze unitary operations in terms of _ quadratic form expansions _ , a form similar to a sum over paths in the computational basis when the phase contributed by each path is described by a quadratic form over . we describe various conditions under which it is possible to efficiently impleme... | we introduce techniques to analyze unitary operations in terms of _ quadratic form expansions _ , a form similar to a sum over paths in the computational basis when the phase contributed by each path is described by a quadratic form over . we show how to relate such a form to an entangled resource akin to that of the o... |
0805.1305 | i | in the context of tropical geometry , it is well known that two tropical curves may share an infinite number of intersection points without sharing a common component . this problem is avoided with the notion of stable intersection , @xcite . given two curves , there is a well defined set of intersection points that va... | we introduce the notion of resultant of two planar curves in the tropical geometry framework . it is shown that , for two generic preimages of the curves to an algebraic framework , their intersection projects exactly onto the stable intersection of the curves . _ keywords _ : tropical geometry , resultants , plane cur... | we introduce the notion of resultant of two planar curves in the tropical geometry framework . we prove that the tropicalization of the algebraic resultant can be used to compute the stable intersection of two tropical plane curves . it is shown that , for two generic preimages of the curves to an algebraic framework ,... |
astro-ph0305288 | c | in this paper we have considered the axisymmetric force - free magnetosphere of an aligned rotating magnetic dipole , under the additional assumptions of ideal mhd and of the uniformity of the field - line angular velocity [ @xmath289 . this fundamental model problem is of great importance to any attempts to understand... | we investigate the axisymmetric magnetosphere of an aligned rotating magnetic dipole surrounded by an ideal force - free plasma . we concentrate on the magnetic field structure around the point of intersection of the separatrix between the open and closed field - line regions and the equatorial plane . we find that in ... | we investigate the axisymmetric magnetosphere of an aligned rotating magnetic dipole surrounded by an ideal force - free plasma . we concentrate on the magnetic field structure around the point of intersection of the separatrix between the open and closed field - line regions and the equatorial plane . we first study t... |
1203.5522 | i | the present paper is devoted to the phenomena of bose einstein condensation ( bec for short ) on non homogeneous networks obtained by adding density zero perturbations to homogeneous cayley trees . even if the unperturbed model already exhibit bec ( cf . @xcite ) , the arising picture for the perturbed situation deser... | we investigate the bose einstein condensation on non homogeneous non amenable networks for the model describing arrays of josephson junctions . the graphs under investigation are obtained by adding density zero perturbations to the homogeneous cayley trees . the present paper is then the application to the bose einst... | we investigate the bose einstein condensation on non homogeneous non amenable networks for the model describing arrays of josephson junctions . the graphs under investigation are obtained by adding density zero perturbations to the homogeneous cayley trees . the resulting topological model , whose hamiltonian is the p... |
1307.7776 | r | we estimate the critical migration timescale in a manner similar to that of @xcite . orbital integrations of two planets are performed with various parameters to determine whether the planets are captured into 2:1 mean motion resonances . figure [ fig : t_a ] shows the evolution of the semimajor axes and eccentricitie... | mass bodies is shorter than that in the restricted problem ; for instance , for the 2:1 resonance between two equal mass bodies , the critical timescale decreases by a factor of 10 . in addition , using the obtained formula , the origin of observed systems that include first | we investigate the condition for capture into first order mean motion resonances using numerical simulations with a wide range of various parameters . in particular , we focus on deriving the critical migration timescale for capture into the 2:1 resonance ; additional numerical experiments for closely spaced resonance... |
1307.7776 | c | we investigated capture into first order mean motion resonances in a system of two bodies undergoing damping of the eccentricity and semimajor axis using _ n_body integrations . in some of our calculations , we considered the case in which the mass of one body is negligible . in addition , we also studied systems with... | we investigate the condition for capture into first order mean motion resonances using numerical simulations with a wide range of various parameters . we find that the critical migration timescale is determined by the planet to stellar mass ratio , and its dependence exhibits power law behavior with index . this de... | we investigate the condition for capture into first order mean motion resonances using numerical simulations with a wide range of various parameters . in particular , we focus on deriving the critical migration timescale for capture into the 2:1 resonance ; additional numerical experiments for closely spaced resonance... |
1307.4119 | i | searches for supersymmetry ( susy ) performed by the large hadron collider ( lhc ) experiments on the center - of - mass energy @xmath5 tev run data have started to set stringent constraints to the strongly - interacting susy particles . they translate to limits on the susy masses up to @xmath6 tev for gluinos and squa... | we investigate the current status of the light neutralino dark matter scenario within the minimal supersymmetric standard model ( mssm ) taking into account latest results from the lhc . we reinterpret a recent search for electroweak supersymmetric particle production based on a signature including multi - taus plus mi... | we investigate the current status of the light neutralino dark matter scenario within the minimal supersymmetric standard model ( mssm ) taking into account latest results from the lhc . a discussion of the relevant constraints , in particular from the dark matter relic abundance , leads us to a manageable simplified m... |
1103.1058 | c | since gravity is of scale free , it is generally believed that in the scenario of hierarchical clustering , the formation and evolution of halos is scale free in a large range of halo mass . however , the dynamics of the system consisting of two components , dark matter and igm , is very different from those of one com... | we find that the distribution of baryon fraction is highly nonuniform on scales from hundreds kpc to a few of mpc , and varies from as low as 1% to a few times of the cosmic mean . numerical results show that is decreasing from at halo mass scales around m to at h m and shows further decrease when halo mass is less tha... | we investigate the dynamical effect of the turbulence in baryonic intergalactic medium ( igm ) on the baryon fraction distribution . in the fully developed nonlinear regime , the igm will evolve into the state of turbulence , containing strong and curved shocks , vorticity and complex structures . turbulence would lead... |
1306.2178 | r | let us begin with a brief review of the earlier results based on which we will continue to explore similar physical effects in our current work . before taking any back - reaction into account , the model we consider is described in @xcite . the authors introduced probe d7/anti - d7 branes in the ads@xmath14 background... | we investigate the effect of the back - reaction by non - supersymmetric probes in the kuperstein - sonnenschein model . in the limit where the back - reaction is small , we find that the landau pole , which serves as the uv cut - off of the background geometry , also serves as an important scale in the corresponding t... | we investigate the effect of the back - reaction by non - supersymmetric probes in the kuperstein - sonnenschein model . in the limit where the back - reaction is small , we discuss physical properties of the back - reacted geometry . we further introduce additional probe flavours in this back - reacted geometry and st... |
1007.2499 | i | scalar field theories have become generic playgrounds for building cosmological models related to particle physics @xcite , and more recently , have played very important contributions in the other branches of cosmology , e.g. , as a powerful tool for providing expanding accelerated universes . also , they have key ro... | we investigate the effects caused by noncommutativity of the phase space generated by two scalar fields that have non minimal conformal couplings to the background curvature in the frw cosmology . furthermore , the noether theorem has been employed to explore the effects of noncommutativity on the underlying symmetrie... | we investigate the effects caused by noncommutativity of the phase space generated by two scalar fields that have non minimal conformal couplings to the background curvature in the frw cosmology . we restrict deformation of the minisuperspace to noncommutativity between the scalar fields and between their canonical co... |
1007.2499 | c | we have carried out an investigation for the role of ncg in cosmological scenarios , based on a four dimensional free potential ( multi)scalar tensor action of gravity , by introducing a nc deformation in the minisuperspace variables . the phase space is generated by two non interacting conformal scalar fields plus... | we restrict deformation of the minisuperspace to noncommutativity between the scalar fields and between their canonical conjugate momenta . then , the investigation is carried out by means of a comparative analysis of the mathematical properties ( supplemented with some diagrams ) of the time evolution of variables in ... | we investigate the effects caused by noncommutativity of the phase space generated by two scalar fields that have non minimal conformal couplings to the background curvature in the frw cosmology . we restrict deformation of the minisuperspace to noncommutativity between the scalar fields and between their canonical co... |
astro-ph9911233 | i | the integrated light of elliptical galaxies contains many clues to their star formation histories . currently , the most popular approach to deciphering the broad band colors and spectral features of elliptical galaxies and star clusters is evolutionary population synthesis ( charlot & bruzual 1991 ; bressan , chiosi ,... | we investigate the effects of abundance and age on the mid - uv spectra and mg strengths of stellar populations using simple population synthesis models . these models are used to constrain the star formation history of four nearby elliptical galaxies and spiral bulges . the mid - uv ( 1800 - 3200 ) light of evolved s... | we investigate the effects of abundance and age on the mid - uv spectra and mg strengths of stellar populations using simple population synthesis models . these models are used to constrain the star formation history of four nearby elliptical galaxies and spiral bulges . the mid - uv ( 1800 - 3200 ) light of evolved s... |
1701.06721 | c | the key findings of this study of the inner gaseous disk of three hbe stars , hd76534 , hd216629 and hd114981 , are : * the emission line spectra of all three stars can be adequately reproduced , in terms of both line strength and shape , from a small ( @xmath134 ) , geometrically thin , gaseous circumstellar disk h... | we investigate the physical properties of the inner gaseous disks of the three , hot , herbig b2e stars , hd76534 , hd114981 and hd216629 , by modelling cfht - espadons spectra using non - lte radiative transfer codes . we assume that the emission lines are produced in a circumstellar disk heated solely by the photosph... | we investigate the physical properties of the inner gaseous disks of the three , hot , herbig b2e stars , hd76534 , hd114981 and hd216629 , by modelling cfht - espadons spectra using non - lte radiative transfer codes . we assume that the emission lines are produced in a circumstellar disk heated solely by the photosph... |
1112.3198 | i | during the development of denotational semantics of programming languages , there was a crucial interest in defining models of computation satisfying particular type equations . for instance , a model of the untyped @xmath1-calculus can be obtained by isolating a _ reflexive _ object ( that is , an object @xmath2 such ... | we investigate the problem of type isomorphisms in a programming language with higher - order references . we first recall the game - theoretic model of higher - order references by abramsky , honda and mccusker . solving an open problem by laurent , we show that two finitely branching arenas are isomorphic if and only... | we investigate the problem of type isomorphisms in a programming language with higher - order references . we first recall the game - theoretic model of higher - order references by abramsky , honda and mccusker . solving an open problem by laurent , we show that two finitely branching arenas are isomorphic if and only... |
1311.0264 | i | jets are ubiquitous and are observed to accompany a variety of astrophysical objects such as , stellar - mass and super - massive black hole candidates , neutron stars , white dwarfs , young stellar objects ( ysos ) etc . these outflows exhibit different physical scales and power at one extreme , agns have jets with ty... | very high terminal speed is possible . this mimics the production of steady mildly relativistic but stronger jets as micro - quasars moves from low hard to intermediate hard spectral states . [ firstpage ] hydrodynamics , radiation hydrodynamics , black hole physics , accretion , accretion discs , jets and outflo... | we investigate the role of radiative driving of shock ejected bipolar outflows from advective accretion discs in a self consistent manner . radiations from the inner disc affects the subsonic part of the jet while those from the pre - shock disc affects the supersonic part , and there by constitutes a multi stage accel... |
1311.0264 | r | in @xcite we have shown in details various cases of accretion solutions , and also have shown that post shock disc naturally produces bipolar outflows . in this paper , therefore we discuss only the shocked accretion solution . the accretion solutions are characteristic by flow parameters like the grand energy @xmath89... | radiations from the inner disc affects the subsonic part of the jet while those from the pre - shock disc affects the supersonic part , and there by constitutes a multi stage acceleration process . we show that the radiation from the inner disc not only accelerate but also increase the mass outflow rate , while the rad... | we investigate the role of radiative driving of shock ejected bipolar outflows from advective accretion discs in a self consistent manner . radiations from the inner disc affects the subsonic part of the jet while those from the pre - shock disc affects the supersonic part , and there by constitutes a multi stage accel... |
astro-ph0103432 | c | the eight clusters subtended by our slit all have ages below @xmath110 myr , with three having ages @xmath683 myr , for a salpeter imf in the range 1100 m@xmath2 . among the three youngest is cluster 5 , the primary target of our stis observations , whose very young age is in agreement with that inferred by @xcite ... | we investigate the star formation history of both the bright star clusters and the diffuse ` field star ' population in the dwarf starburst galaxy ngc 5253 using longslit ultraviolet spectroscopy obtained with the space telescope imaging spectrograph ( stis ) . the diffuse light spectrum lacks the strong o - star wind... | we investigate the star formation history of both the bright star clusters and the diffuse ` field star ' population in the dwarf starburst galaxy ngc 5253 using longslit ultraviolet spectroscopy obtained with the space telescope imaging spectrograph ( stis ) . the slit covers a physical area of 370.6 pc and includes... |
1408.4750 | i | the kinematics of the narrow line region ( nlr ) of ngc1068 has been the subject of many studies over the years , the most recent and detailed being those of @xcite and @xcite , based on long - slit optical spectroscopy of the inner few hundred parsecs obtained with the space telescope imaging spectrograph aboard the h... | we map the kinematics of the inner ( 200pc ) narrow - line region ( nlr ) of the seyfert2 galaxy ngc1068 using the instrument nifs and adaptative optics at the gemini north telescope . channel maps and position - velocity diagrams are presented at a spatial resolution ofpc and spectral resolution in the emission lines ... | we map the kinematics of the inner ( 200pc ) narrow - line region ( nlr ) of the seyfert2 galaxy ngc1068 using the instrument nifs and adaptative optics at the gemini north telescope . channel maps and position - velocity diagrams are presented at a spatial resolution ofpc and spectral resolution in the emission lines ... |
1408.4750 | i | we have mapped the inner ( 200pc ) nlr kinematics of the seyfert 2 galaxy ngc1068 on the basis of near - ir integral - field spectroscopy in the emission lines [ feii]@xmath2 m , h@xmath3 m and br@xmath4 . we have compared the ionized and molecular gas kinematics and have used three different models to reproduce channe... | the [ feii ] emission line provides a better coverage of the nlr outflow than the previously used [ oiii] emission line , extending beyond the area of the bi - polar cone observed in br and [ oiii ] . this is mainly due to the contribution of the redshifted channels to the ne of the nucleus , supporting its origin in a... | we map the kinematics of the inner ( 200pc ) narrow - line region ( nlr ) of the seyfert2 galaxy ngc1068 using the instrument nifs and adaptative optics at the gemini north telescope . channel maps and position - velocity diagrams are presented at a spatial resolution ofpc and spectral resolution in the emission lines ... |
astro-ph0410640 | i | dwarf galaxies are thought to be the building blocks in the assembly of more massive galaxies within the hierarchical picture of structure formation . these galaxies are also very important venues in which questions about cosmology , galaxy evolution , and star formation may be answered . dwarf irregular galaxies are r... | this corresponds to [ o / h ] = dex , or 15% of the solar value . in regions where was not measured , oxygen abundances derived with bright - line methods are in general agreement with direct values of the oxygen abundance to an accuracy of about 0.2 dex . in general , the present measurements show that the region... | we obtained new optical spectra of 13 regions in wlm with efosc2 ; oxygen abundances are derived for nine regions . the temperature - sensitive emission line was measured in two bright regions hm 7 and hm 9 . the direct oxygen abundances for hm 7 and hm 9 are 12log(o / h ) = and , respectively . we adopt a mean... |
astro-ph0410640 | c | optical spectra of 13 regions were obtained in wlm , and oxygen abundances were derived in nine regions . was measured in bright regions hm 7 and hm 9 . the resulting direct oxygen abundance for hm 7 is in agreement with previously published values . our @xmath89 detection of in hm 9 confirms the lower signal -... | we obtained new optical spectra of 13 regions in wlm with efosc2 ; oxygen abundances are derived for nine regions . the temperature - sensitive emission line was measured in two bright regions hm 7 and hm 9 . we adopt a mean oxygen abundance of 12log(o / h ) = . however , there is still a 0.62 dex discrepancy in... | we obtained new optical spectra of 13 regions in wlm with efosc2 ; oxygen abundances are derived for nine regions . the temperature - sensitive emission line was measured in two bright regions hm 7 and hm 9 . the direct oxygen abundances for hm 7 and hm 9 are 12log(o / h ) = and , respectively . we adopt a mean... |
cond-mat9506091 | i | recently the growth of rough interfaces has witnessed an explosion of theoretical , numerical , and experimental studies , fueled by the broad interdisciplinary aspects of the subject @xcite . applications can be so diverse as imbibition in porous media , fluid fluid displacement , fire front motion , and the motion o... | however , we find that some results can not be understood in terms of the exponents obtained for the two universality classes _ at _ the depinning transition . in order to understand these remaining disagreements , we investigate the scaling properties of models in each of the two universality classes _ above _ the dep... | we perform a systematic study of several models that have been proposed for the purpose of understanding the motion of driven interfaces in disordered media . we identify two distinct universality classes : ( i ) one of these , referred to as directed percolation depinning ( dpd ) , can be described by a langevin equat... |
cond-mat9506091 | i | to summarize , we perform a systematic study of several models proposed to understand the motion of driven interfaces in disordered media . we are able to identify _ two _ distinct universality classes . for one of these universality classes , qew , we observe that it can be described by a langevin equation similar to ... | we perform a systematic study of several models that have been proposed for the purpose of understanding the motion of driven interfaces in disordered media . we identify two distinct universality classes : ( i ) one of these , referred to as directed percolation depinning ( dpd ) , can be described by a langevin equat... | we perform a systematic study of several models that have been proposed for the purpose of understanding the motion of driven interfaces in disordered media . we identify two distinct universality classes : ( i ) one of these , referred to as directed percolation depinning ( dpd ) , can be described by a langevin equat... |
1002.1853 | i | galaxies consist of vast numbers of stars formed from molecular clouds . it has therefore been suggested that the process of star formation in galaxies depends largely on the distribution , kinematics , and physical conditions of the molecular gas . one of the primary molecular gas properties critical to star formation... | in addition , hcn/co in our sample galaxies exhibit strong correlations with the iras flux ratios . it is a well established fact that there exists a strong correlation between dense molecular gas and star formation activities , but our results suggest that molecular gas temperature is also an important parameter . | we performedco(1 0 ) ,co(1 0 ) , and hcn(1 0 ) single - dish observations ( beam size ) toward nearby starburst and non - starburst galaxies using the nobeyama 45 m telescope . theco(1 0 ) and hcn(1 0 ) emissions were detected from all the seven starburst galaxies , with the intensities of both lines being simila... |
1002.1853 | r | the parameters of the observed lines from all of the sample galaxies ( peak main beam brightness temperature , @xmath40 , and integrated intensity , @xmath41 ) are summarized in table [ table - res - prop ] , and the calculated integrated intensity ratios are summarized in table [ table - res - ratio ] . since we did... | emission was detected from all three galaxies , while the hcn(1 0 ) emission was weakly or not detected in past observations . this result indicates that the hcn/co intensity ratios are significantly larger ( ) in the starburst galaxy samples than the non - starburst galaxy samples ( ) . | we performedco(1 0 ) ,co(1 0 ) , and hcn(1 0 ) single - dish observations ( beam size ) toward nearby starburst and non - starburst galaxies using the nobeyama 45 m telescope . theco(1 0 ) and hcn(1 0 ) emissions were detected from all the seven starburst galaxies , with the intensities of both lines being simila... |
1002.1853 | c | we conducted a survey of @xmath0co(1 0 ) , @xmath1co(1 0 ) , and hcn(1 0 ) lines toward seven starburst and three non - starburst galaxies nearby using the nobeyema 45 m telescope ( beam size @xmath2 ) . the @xmath1co(1 0 ) and hcn(1 0 ) lines were obtained for all the sample galaxies , but the @xmath0co(1 0 ) d... | we performedco(1 0 ) ,co(1 0 ) , and hcn(1 0 ) single - dish observations ( beam size ) toward nearby starburst and non - starburst galaxies using the nobeyama 45 m telescope . theco(1 0 ) and hcn(1 0 ) emissions were detected from all the seven starburst galaxies , with the intensities of both lines being simila... | we performedco(1 0 ) ,co(1 0 ) , and hcn(1 0 ) single - dish observations ( beam size ) toward nearby starburst and non - starburst galaxies using the nobeyama 45 m telescope . theco(1 0 ) and hcn(1 0 ) emissions were detected from all the seven starburst galaxies , with the intensities of both lines being simila... |
1405.3239 | c | _ chandra _ observations of 21 show spectral softening over the pwn , with the photon spectral index ranging from @xmath164 at the inner ( radius @xmath165 ) region to @xmath166 at the outer @xmath167 radius annulus . _ nustar _ observations confirm this by showing spectral softening below @xmath168 kev , as shown i... | we present _ nustar _ high energy x - ray observations of the pulsar wind nebula ( pwn)/supernova remnant 21 . we detect integrated emission from the nebula up to kev , and resolve individual spatial features over a broad x - ray band for the first time . the morphology seen by _ nustar clearly detects non - thermal ... | we present _ nustar _ high energy x - ray observations of the pulsar wind nebula ( pwn)/supernova remnant 21 . we detect integrated emission from the nebula up to kev , and resolve individual spatial features over a broad x - ray band for the first time . the morphology seen by _ nustar _ agrees well with that seen ... |
1009.2761 | i | one of the main ongoing efforts in cold atom gases is the investigation of strongly correlated phases . our theoretical understanding of strongly correlated phases is , in general , far from complete . for example , computational studies , of fermions in particular , are severely limited . as a result , the possibility... | we present a comprehensive study of the thermodynamic properties of the three - dimensional fermionic hubbard model , with application to cold fermionic atoms subject to an optical lattice and a trapping potential . special attention is devoted to understand the implications that thermodynamic properties of this system... | we present a comprehensive study of the thermodynamic properties of the three - dimensional fermionic hubbard model , with application to cold fermionic atoms subject to an optical lattice and a trapping potential . our study is focused on the temperature range of current experimental interest . we employ two theoretic... |
1009.2761 | c | in this article , we performed a detailed study of the thermodynamics of the three - dimensional fermionic hubbard model , for a rather wide range of couplings . we mainly focused on the temperature regime @xmath216 , of current interest for experiments on cold fermionic atoms in optical lattices . our theoretical stud... | our study is focused on the temperature range of current experimental interest . we employ two theoretical methods - dynamical mean - field theory and high - temperature series - and perform comparative benchmarks to delimit their respective range of validity . the first contribution is due to the redistribution of ato... | we present a comprehensive study of the thermodynamic properties of the three - dimensional fermionic hubbard model , with application to cold fermionic atoms subject to an optical lattice and a trapping potential . our study is focused on the temperature range of current experimental interest . we employ two theoretic... |
0804.1906 | c | the radio galaxy 4c+24.36 has wat morphology in all the images presented in this paper ( figs . [ fig : hr_image610 ] and [ fig : hr_images ] ) , with two bright continuous jets and very extended radio lobes . such components are very symmetric in total flux density and extent ( tab . 2 ) , as well as in spectral index... | we find that the source major axis is likely oriented at a small angle with respect to the plane of the sky . the wide angle tail morphology can be reasonably explained by adopting a simple hydrodynamical model in which both ram pressure ( driven by the motion of the host galaxy ) and buoyancy forces contribute to be... | we present a detailed radio morphological study and spectral analysis of the wide angle tail radio source 4c+24.36 associated with the dominant galaxy in the relaxed galaxy cluster awm4 . our study is based on new high sensitivity gmrt observations at 235 mhz , 327 mhz and 610 mhz , and on literature and archival dat... |
0804.1906 | i | in this paper we presented a detailed morphological and spectral analysis , at radio wavelengths , of the wat radio galaxy 4c+24.36 , located at the core of the poor galaxy cluster awm4 , based on new high sensitivity observations at 235 mhz , 327 mhz and 610 mhz , using the gmrt , and literature and archival data a... | we present a detailed radio morphological study and spectral analysis of the wide angle tail radio source 4c+24.36 associated with the dominant galaxy in the relaxed galaxy cluster awm4 . our study is based on new high sensitivity gmrt observations at 235 mhz , 327 mhz and 610 mhz , and on literature and archival dat... | we present a detailed radio morphological study and spectral analysis of the wide angle tail radio source 4c+24.36 associated with the dominant galaxy in the relaxed galaxy cluster awm4 . our study is based on new high sensitivity gmrt observations at 235 mhz , 327 mhz and 610 mhz , and on literature and archival dat... |
1003.0020 | c | we report in this paper on the properties of a peculiar and unique source at z=0.359 , cid-42 , in a survey of x - ray sources with acs counterparts in cosmos . cid-42 is a unique source in three specific ways . first , in the 2 deg@xmath6 cosmos area , there are @xmath14 x - ray sources out of @xmath1550 at z@xmath40.... | we present a detailed study of a peculiar source detected in the cosmos survey at z=0.359 . a large ( km / s ) velocity offset between the narrow and broad components of h has been measured in three different optical spectra from the vlt / vimos and magellan / imacs instruments . cid-42 is also the only x - ray source ... | we present a detailed study of a peculiar source detected in the cosmos survey at z=0.359 . source cxoc j100043.1 + 020637 , also known as cid-42 , presents two compact optical sources embedded in the same galaxy . the distance between the two , measured in the hst / acs image , is 0.495``.005 '' that , at the redshif... |
1003.0020 | c | we have reported the multiwavelength properties of cid-42 , which presents three unusual features : two close sources , embedded in the same galaxy , resolved in the optical acs image , but unresolved in the x - ray one , a high velocity offset , measured between the broad and narrow h@xmath2 lines in 3 different optic... | source cxoc j100043.1 + 020637 , also known as cid-42 , presents two compact optical sources embedded in the same galaxy . we envisage two possible explanations , both exceptional , for this system : ( 1 ) a gravitational wave recoiling black hole ( bh ) , caught 1 - 10 myr after merging , ( 2 ) a type 1/ type 2 syste... | we present a detailed study of a peculiar source detected in the cosmos survey at z=0.359 . source cxoc j100043.1 + 020637 , also known as cid-42 , presents two compact optical sources embedded in the same galaxy . the distance between the two , measured in the hst / acs image , is 0.495``.005 '' that , at the redshif... |
1409.1076 | i | thin sheets with repetitive metallic inclusions or exclusions have been used extensively in the past in antenna applications to control the properties of reflected or transmitted power , e.g. its direction , phase , or polarization @xcite . such surfaces have received increasing attention lately , as part of the intens... | we present a formulation of the interaction between a given source field and a scalar huygens metasurface ( hms ) , a recently introduced promising concept for wavefront manipulation based on a sheet of orthogonal electric and magnetic dipoles . utilizing the equivalent surface impedance representation of these metasur... | we present a formulation of the interaction between a given source field and a scalar huygens metasurface ( hms ) , a recently introduced promising concept for wavefront manipulation based on a sheet of orthogonal electric and magnetic dipoles . utilizing the equivalent surface impedance representation of these metasur... |
0812.0306 | i | the recently discovered `` -loud '' binaries ( grlb ) form a new sub - class of galactic binary star systems which emit gev - tev s @xcite . these are high mass x - ray binaries ( hmxrb ) composed of a compact object ( a black hole or a neutron star ) orbiting a massive star . the detection of s with energies up to 10 ... | this is related to the fact that most neutrinos are produced in pp interactions close to the bright massive star , in a region optically thick for the tev s. considering the specific example of , we derive upper bounds for neutrino fluxes from various proton injection spectra compatible with the observed multi - wavele... | we present a hadronic model of activity for galactic -loud binaries , in which the multi - tev neutrino flux from the source can be much higher and/or harder than the detected tev flux . this is related to the fact that most neutrinos are produced in pp interactions close to the bright massive star , in a region optic... |
1108.0429 | i | understanding the nature and formation of cosmic dust is crucial to our understanding of the cosmos . over its 50-year history , infrared ( ir ) astronomy has shown that dust contributes to the physical processes inherent in star formation and mass - loss from evolved stars , as well as to several interstellar processe... | we present a laboratory study of silicate glasses of astrophysically relevant compositions including olivines , pyroxenes and melilites . with emphasis on the classic si o stretching feature near 10 m , we compare infrared spectra of our new samples with laboratory spectra on ostensibly similar compositions , and also... | we present a laboratory study of silicate glasses of astrophysically relevant compositions including olivines , pyroxenes and melilites . with emphasis on the classic si o stretching feature near 10 m , we compare infrared spectra of our new samples with laboratory spectra on ostensibly similar compositions , and also... |
astro-ph0504313 | i | the determination of the stellar content of unresolved systems from observations of their integrated light is a fundamental challenge to extragalactic astronomers . the problem has been traditionally approached by comparing the integrated properties ( spectral energy distributions , line strengths , colors ) of remote ... | we present a new library of integrated spectra of 40 galactic globular clusters , obtained with the blanco 4-m telescope and the r - c spectrograph at the _ cerro tololo interamerican observatory_. the spectra cover the range 3350 6430 with 3.1 ( fwhm ) resolution . the selected targets span a wide range of cluster pa... | we present a new library of integrated spectra of 40 galactic globular clusters , obtained with the blanco 4-m telescope and the r - c spectrograph at the _ cerro tololo interamerican observatory_. the spectra cover the range 3350 6430 with 3.1 ( fwhm ) resolution . the spectroscopic observations and data reduction we... |
0711.1617 | i | eclipsing binary stars ( ebs ) are important for astrophysical research in many ways . they may be used to obtain accurate estimates of star masses and radii ( * ? ? ? * and references therein ) . precise determination of stellar parameters can in turn be used to put theories of stellar structure and evolution to a str... | we present a new sample of eclipsing binary stars in the large magellanic cloud ( lmc ) , expanding on a previous sample of 611 objects and a new sample of eclipsing binary stars in the small magellanic cloud ( smc ) , that were identified in the light curve database of the macho project . we perform a cross correlatio... | we present a new sample of eclipsing binary stars in the large magellanic cloud ( lmc ) , expanding on a previous sample of 611 objects and a new sample of eclipsing binary stars in the small magellanic cloud ( smc ) , that were identified in the light curve database of the macho project . we perform a cross correlatio... |
1610.09159 | i | hall magnetohydrodynamics ( hmhd hereafter ) provides a natural extension of ideal or resistive magnetohydrodynamic ( mhd ) models for plasmas in the limit of small scales , where the magnetic field is frozen into electron fluid but ions are decoupled from the magnetic field lines @xcite . as related to different masse... | we present a numerical solver for plasma dynamics simulations in hall magnetohydrodynamic ( hmhd ) approximation in one , two and three dimensions . we consider both isotropic and anisotropic thermal pressure cases , where a general gyrotropic approximation is used . the numerical scheme incorporates second - order run... | we present a numerical solver for plasma dynamics simulations in hall magnetohydrodynamic ( hmhd ) approximation in one , two and three dimensions . we consider both isotropic and anisotropic thermal pressure cases , where a general gyrotropic approximation is used . both explicit energy conservation equation and gener... |
1610.09159 | i | we present a second - order accurate solver for the hmhd equations with anisotropic or isotropic thermal pressure . both explicit energy conservation equation and polytropic state equations can be used in this approach as the closure for the hmhd model . the implemented code was validated using test problems previously... | both explicit energy conservation equation and general polytropic state equations are considered . the implemented code is validated using several test problems previously described in the literature . additionally , we propose a new validation method for hmhd codes based on solitary waves that provides a possibility o... | we present a numerical solver for plasma dynamics simulations in hall magnetohydrodynamic ( hmhd ) approximation in one , two and three dimensions . we consider both isotropic and anisotropic thermal pressure cases , where a general gyrotropic approximation is used . both explicit energy conservation equation and gener... |
1201.1290 | i | the ionizing continuum of stars at @xmath4 is of major importance for interpreting emission line observations of galaxies because many of the strong lines observed in the spectra of galaxies , such as @xmath5\:\lambda5007}$ ] , @xmath6\:\lambda3869}$ ] and @xmath0 , have ionization potentials in excess of 13.6 ev . d... | we present a sample of 2865 emission line galaxies with strong nebular emissions in sloan digital sky survey data release 7 and use this sample to investigate the origin of this line in star - forming galaxies . we also present an analysis of the physical properties of 189 star forming galaxies with strong emissions . ... | we present a sample of 2865 emission line galaxies with strong nebular emissions in sloan digital sky survey data release 7 and use this sample to investigate the origin of this line in star - forming galaxies . we show that star - forming galaxies and galaxies dominated by an active galactic nucleus form clearly separ... |
1111.4016 | c | we have presented a simple physical picture of the qubit evolution due to its measurement in the circuit qed setup . the `` spooky '' back - action is universal , it is caused by gradual extraction of information about the qubit state . the `` realistic '' back - action is due to a specific mechanism : fluctuation of t... | we present a simple formalism describing evolution of a qubit in the process of its measurement in a circuit qed setup . when a phase - sensitive amplifier is used , the evolution depends on only one output quadrature , and the formalism is the same as for a broadband setup . when a phase - preserving amplifier is used... | we present a simple formalism describing evolution of a qubit in the process of its measurement in a circuit qed setup . when a phase - sensitive amplifier is used , the evolution depends on only one output quadrature , and the formalism is the same as for a broadband setup . when a phase - preserving amplifier is used... |
0911.4532 | i | the number of discovered extrasolar planets has been increasing quickly since the first extrasolar planet , 51 pegasi b , was detected around a solar - type star @xcite . 51 pegasi b is the prototype of a class of exoplanets known as hot jupiters " because they are generally jupiter - mass planets located @xmath8 au f... | the model takes into account the disk locking of stellar spin as well as the tidal and magnetic interactions between the star and the planet . the goal in this paper is to study how the orbital evolution inside the magnetospheric cavity depends on the cavity size , planet mass , and orbital eccentricity . in the presen... | we present a simplified model to study the orbital evolution of a young hot jupiter inside the magnetospheric cavity of a proto - planetary disk . the model takes into account the disk locking of stellar spin as well as the tidal and magnetic interactions between the star and the planet . we focus on the orbital evolut... |
0911.4532 | i | we construct a simple model to study the orbital evolution of a young hot jupiter in an eccentric orbit inside a magnetospheric cavity of a proto - planetary disk around a ctts . for the sake of simplicity , we assume that the magnetospheric cavity of the protoplanetary disk is truncated by a stellar dipole field . thr... | we present a simplified model to study the orbital evolution of a young hot jupiter inside the magnetospheric cavity of a proto - planetary disk . we only target the mass range from 0.7 to 2 jupiter masses . in the case of the large cavity corresponding to the rotational period days , the planet of mass jupiter mass wi... | we present a simplified model to study the orbital evolution of a young hot jupiter inside the magnetospheric cavity of a proto - planetary disk . the model takes into account the disk locking of stellar spin as well as the tidal and magnetic interactions between the star and the planet . we focus on the orbital evolut... |
1203.1048 | i | symmetry breaking is a crucial aspect of modern particle physics . in particular the symmetry breaking sectors of theories extending the standard model are studied intensively . many of the most puzzling problems in generic standard model extensions , such as the gauge hierarchy and parameter proliferation problems , a... | we present a systematic approach to finding higgs vacuum expectation values , which break a symmetry to differently embedded isomorphic copies of a subgroup . we give an explicit formula for recovering each point in the vacuum manifold of a higgs field which breaks . these results are illustrated explicitly for adjoint... | we present a systematic approach to finding higgs vacuum expectation values , which break a symmetry to differently embedded isomorphic copies of a subgroup . we give an explicit formula for recovering each point in the vacuum manifold of a higgs field which breaks . in particular we systematically identify the vacuum ... |
0807.2645 | c | we have applied an existing monte - carlo ly@xmath0 radiative transfer code ( described and tested extensively in * ? ? ? * ) to the calculation of the pressure that is exerted by ly@xmath0 photons on an optically thick medium . this code enabled us to perform ( the first ) direct , accurate calculations of ly@xmath0 r... | we show that the radiation force that ly photons exert on hydrogen gas in the neutral intergalactic medium ( igm ) , that surrounds minihalos that host the first stars , may exceed gravity by orders of magnitude and drive supersonic winds . ly radiation pressure may also dominate over gravity in the neutral igm that su... | we present accurate monte - carlo calculations of ly radiation pressure in a range of models which represent galaxies during various epochs of our universe . we show that the radiation force that ly photons exert on hydrogen gas in the neutral intergalactic medium ( igm ) , that surrounds minihalos that host the first ... |
1703.08969 | i | atomic clocks based on optical lattices are capable of proffering outstanding stable and accurate time keeping devices . a fundamental feature of an optical lattice clock is that it interrogates an optical transition with the controlled atomic motion @xcite . at present , the most stable clock is based on the optical l... | rev . a * 92 * , 031402(r ) ( 2015 ) ] for the linearly polarized light . moreover , the actual clock transitions in these ions are carried out among the hyperfine levels . the values in these hyperfine transitions are estimated and found to be different from for the atomic transitions due to different contributions co... | we present additional magic wavelengths ( ) for the clock transitions in the alkaline - earth metal ions considering circular polarized light aside from our previously reported values in [ j. kaur et al . , phys . rev . a * 92 * , 031402(r ) ( 2015 ) ] for the linearly polarized light . contributions from the vector co... |
1703.08969 | m | as discussed in our earlier works @xcite , each component of @xmath134 can be conveniently evaluated in the considered alkaline earth ions , in which many of the low - lying states have electronic configurations as a common closed core of inert gas atoms and a well defined valence orbital , by classifying into three di... | , phys . we also present values explicitly at the 1064 nm for the atomic states associated with the clock transitions which may be useful for creating `` high - field seeking '' traps for the above ions using the nd : yag laser . the tune out wavelengths at which the states would be free from the stark shifts are also ... | we present additional magic wavelengths ( ) for the clock transitions in the alkaline - earth metal ions considering circular polarized light aside from our previously reported values in [ j. kaur et al . , phys . rev . a * 92 * , 031402(r ) ( 2015 ) ] for the linearly polarized light . contributions from the vector co... |
0906.3735 | i | this article has two purposes . the first one is to present a new implementation of dynamical mean - field theory ( dmft ) within electronic structure calculation methods . this implementation is based on a highly precise full - potential linear augmented plane wave method ( flapw ) , as implemented in the wien2k elect... | our findings support the physical picture of a metal with intermediate correlations . the average value of the mass renormalization of the fe 3 bands is about , in reasonable agreement with the picture inferred from photoemission experiments . the discrepancies between different lda+dmft calculations ( all technically ... | we present an approach that combines the local density approximation ( lda ) and the dynamical mean - field theory ( dmft ) in the framework of the full - potential linear augmented plane waves ( flapw ) method . wannier - like functions for the correlated shell are constructed by projecting local orbitals onto a set o... |
0906.3735 | c | in the first part of this work , we present an implementation of lda+dmft in the framework of the full - potential linearized augmented plane waves method . we formulate the dmft local impurity problem in the basis of wannier orbitals , while the full lattice green s function is written in the basis of bloch eigenstate... | we present an approach that combines the local density approximation ( lda ) and the dynamical mean - field theory ( dmft ) in the framework of the full - potential linear augmented plane waves ( flapw ) method . wannier - like functions for the correlated shell are constructed by projecting local orbitals onto a set o... | we present an approach that combines the local density approximation ( lda ) and the dynamical mean - field theory ( dmft ) in the framework of the full - potential linear augmented plane waves ( flapw ) method . wannier - like functions for the correlated shell are constructed by projecting local orbitals onto a set o... |
astro-ph0507041 | r | we use an idl - based program to detect sources in both the acis - s and the _ xmm - newton _ pn data . as in the previous applications ( e.g. , wang et al . 2003 ; wang 2004a ) , this program , optimized to detect point - like sources , uses a combination of detection algorithms : wavelet , sliding - box , and maximu... | we present an x - ray study of our nearest starburst galaxy ic 10 , based on _ xmm - newton _ and observations . the brightest source in the ic 10 field , x-1 , has a mean 0.3 - 8.0 kev luminosity of and shows a large variation by a factor of up to on time scales of s during the _ xmm - newton _ observation . there ... | we present an x - ray study of our nearest starburst galaxy ic 10 , based on _ xmm - newton _ and observations . a list of 73 _ xmm - newton _ and 28 detections of point - like x - ray sources in the field is provided ; a substantial fraction of them are likely stellar objects in the milky way due to the low galacti... |
astro-ph0507041 | i | we have conducted a careful analysis of the _ xmm - newton _ and x - ray ccd observations of the nearby starburst galaxy . in particular , we have devised an effective method to remove the ccd - readout streaks of the bright source x-1 . the main results of our analysis are as follows : * a list of 73 _ xmm - ne... | a list of 73 _ xmm - newton _ and 28 detections of point - like x - ray sources in the field is provided ; a substantial fraction of them are likely stellar objects in the milky way due to the low galactic latitude location of ic 10 . the x - ray spectra of the source indicate the presence of a multi - color blackbo... | we present an x - ray study of our nearest starburst galaxy ic 10 , based on _ xmm - newton _ and observations . a list of 73 _ xmm - newton _ and 28 detections of point - like x - ray sources in the field is provided ; a substantial fraction of them are likely stellar objects in the milky way due to the low galacti... |
1611.04543 | i | the coupling between carriers and phonons is known or believed to be important for many materials , including cuprates,@xcite manganites , @xcite , nickelates @xcite and bismuth perovskites.@xcite these materials display a variety of interesting phenomena , including , but not limited to , high - temperature supercondu... | , we find a novel type of sharp transition , where the polaron ground state momentum jumps discontinuously from to . the nature and origin of this transition is investigated and compared to that of the su - schrieffer - heeger ( ssh ) model , where a sharp but smooth transition was previously reported . we argue that s... | we present exact diagonalization and momentum average approximation ( ma ) results for the single polaron properties of a one - dimensional two - band model with phonon - modulated hopping . at strong electron - phonon coupling , we find a novel type of sharp transition , where the polaron ground state momentum jumps d... |
1505.03158 | i | over the past two decades , observations of exoplanets have uncovered a stunning diversity of systems . major improvements in the capabilities of space- and ground - based telescopes in recent years have led to the discovery and characterization of hundreds of new exoplanets , covering a broad range of orbital properti... | we present full - orbit phase curve observations of the eccentric ( ) transiting hot jupiter wasp-14b obtained in the 3.6 and 4.5 m bands using the _ spitzer space telescope_. we use two different methods for removing the intrapixel sensitivity effect and compare their efficacy in decoupling the instrumental noise . | we present full - orbit phase curve observations of the eccentric ( ) transiting hot jupiter wasp-14b obtained in the 3.6 and 4.5 m bands using the _ spitzer space telescope_. we use two different methods for removing the intrapixel sensitivity effect and compare their efficacy in decoupling the instrumental noise . o... |
1505.03158 | c | we combine the two transit times calculated from our phase curve observations with all other published values @xcite to arrive at an updated ephemeris for the wasp-14 system . here , we define the zeroth epoch as that of the transit nearest in time to the error - weighted mean of all measured transit times . the transi... | these same models tend to over - predict the nightside emission at 3.6 m , while under - predicting the nightside emission at 4.5 m . we propose that this discrepancy might be explained by an enhanced global c / o ratio . in addition , we find that the phase curves of wasp-14b ( ) are consistent with a much lower alb... | we present full - orbit phase curve observations of the eccentric ( ) transiting hot jupiter wasp-14b obtained in the 3.6 and 4.5 m bands using the _ spitzer space telescope_. we use two different methods for removing the intrapixel sensitivity effect and compare their efficacy in decoupling the instrumental noise . o... |
1505.03158 | c | in this paper we present the first phase curve observations of the eccentric hot jupiter wasp-14b in the _ spitzer _ 3.6 and 4.5 @xmath1 m bandpasses . we compare two different techniques pixel mapping and pixel - level decorrelation for correcting the intrapixel sensitivity effect and find that the pixel mapping me... | our measured secondary eclipse depths of and at 3.6 and 4.5 m , respectively , are both consistent with a blackbody temperature of k. we place a upper limit on the nightside flux at 3.6 m and find it to be of the dayside flux , corresponding to a brightness temperature of 1079 k. at 4.5 m , the minimum planet flux... | we present full - orbit phase curve observations of the eccentric ( ) transiting hot jupiter wasp-14b obtained in the 3.6 and 4.5 m bands using the _ spitzer space telescope_. we use two different methods for removing the intrapixel sensitivity effect and compare their efficacy in decoupling the instrumental noise . o... |
astro-ph0003085 | i | clusters of galaxies , by virtue of being the largest known virialized objects , are important probes of large scale structure and can be used to test cosmological models . rich clusters are extremely massive , @xmath1@xmath2 , as indicated by the presence of strongly gravitationally lensed background galaxies and by t... | these measurements , which directly probe the pressure of the cluster s gas , show the gas distribution to be strongly aspherical , as do the x - ray and gravitational lensing observations . we calculate the cluster s gas mass fraction in two ways . we first compare the gas mass derived from the sz measurements to the ... | we present interferometric measurements of the sunyaev - zeldovich ( sz ) effect towards the galaxy cluster abell 370 . these measurements , which directly probe the pressure of the cluster s gas , show the gas distribution to be strongly aspherical , as do the x - ray and gravitational lensing observations . we calcul... |
astro-ph0307265 | c | a physico - chemical investigation of the symmetrical pairs of structures rim , inner and outer knots , and jetlike systems connecting the latter in ngc 7009 is presented . this study , the most extensive ( eight individual regions along the major axis ) , better resolved ( 1 arcsec spatial resolution within the cen... | we present long - slit optical spectra along the major axis of the planetary nebula ngc 7009 . these data allow us to discuss the physical , excitation and chemical properties of all the morphological components of the nebula , including its remarkable systems of knots and jets . i ) _ the electron temperature through... | we present long - slit optical spectra along the major axis of the planetary nebula ngc 7009 . these data allow us to discuss the physical , excitation and chemical properties of all the morphological components of the nebula , including its remarkable systems of knots and jets . the main results of this analysis are ... |
astro-ph0002033 | c | our observations of nvss 2146 + 82 clearly show that it is an unusually large fr ii radio galaxy . its angular distance from the north lobe to the south lobe gives an unusually large extent of @xmath96 . for our assumed cosmology and our measured redshift of @xmath0 , the linear extent of the radio structure is 4@xmath... | the radio structure is normal for an fr ii source except for its large size and regions in the lobes with unusually flat radio spectra . this object is therefore the second largest fr ii known ( 3c 236 is mpc ) . several other giant radio galaxies have been found in regions with overdensities of nearby galaxies , and ... | we present multi - frequency vla , multicolor ccd imaging , optical spectroscopy , and _ rosat _ hri observations of the giant fr ii radio galaxy nvss 2146 + 82 . this galaxy , which was discovered by the nrao vla sky survey ( nvss ) , has an angular extent of nearly 20 from lobe to lobe . the radio structure is norma... |
1509.07474 | r | to search for possible counterparts of 3fgl j2039.6@xmath15618 in our multi - wavelength observations , we used as a reference its recent 3fgl position ( acero et al . 2015 ) : @xmath29 and @xmath30 ( j2000 ) . its associated 95% confidence position error ellipse has semi - major and semi - minor axis of 2.6 and 2.4 ,... | we present multi - wavelength observations of the unassociated-ray source 3fgl j2039.6 detected by the _ fermi _ large area telescope . the source-ray properties suggest that it is a pulsar , most likely a millisecond pulsar , for which neither radio nor-ray pulsations have been detected yet . the brightest of these x... | we present multi - wavelength observations of the unassociated-ray source 3fgl j2039.6 detected by the _ fermi _ large area telescope . the source-ray properties suggest that it is a pulsar , most likely a millisecond pulsar , for which neither radio nor-ray pulsations have been detected yet . we observed 3fgl j2039.6... |
1509.07474 | c | we carried out multi - wavelength observations of the unidentified _ fermi_-lat source 3fgl j2039.6@xmath15618 with _ xmm - newton _ and grond . we detected a likely x - ray counterpart ( source 3 ) within the @xmath0-ray error box of 3fgl j2039.6@xmath15618 , which is characterised by a pl x - ray spectrum ( @xmath3... | the counterpart features a flux modulation with a period of 0.22748.00043 d that coincides , within the errors , with that of the x - ray source , confirming the association based on the positional coincidence . we interpret the observed x - ray / optical periodicity as the orbital period of a close binary system where... | we present multi - wavelength observations of the unassociated-ray source 3fgl j2039.6 detected by the _ fermi _ large area telescope . the source-ray properties suggest that it is a pulsar , most likely a millisecond pulsar , for which neither radio nor-ray pulsations have been detected yet . we observed 3fgl j2039.6... |
1605.00742 | c | as a function of eddington ratio for our _ chandra _ targets ( red filled star symbols ) , the four mbh agn with @xmath187 from ( * ? ? ? * blue triangles ) , the two mbh agn with @xmath187 from ( * ? ? ? * cyan upside down triangles ) , and the high-@xmath4 sample ( circles ) . arrows denote upper limits on @xmath3... | we compare the x - ray properties of these seven low - mass active galactic nuclei ( agn ) to a total of 73 other low - mass agn in the literature with published _ chandra _ observations ( with eddington ratios extending from ) . we do not find any statistical differences between low- and high - eddington ratio low - m... | we present new _ chandra _ x - ray observations of seven low - mass black holes ( ) accreting at low - bolometric eddington ratios between . we compare the x - ray properties of these seven low - mass active galactic nuclei ( agn ) to a total of 73 other low - mass agn in the literature with published _ chandra _ obser... |
astro-ph0509195 | r | the snls officially started in june 2003 ( there was a presurvey ramp - up to full operations ) , and we began using gemini - n and s to observe sn candidates in august 2003 ( semester 2003b ) . we usually obtain the gemini data within a day or two of the observations and produce `` real - time '' reductions . after th... | we achieve an improvement in the sn ia spectroscopic confirmation rate : at gemini 71% of candidates are now confirmed as sne ia , compared to 54% using the methods of previous surveys . this is despite the comparatively high redshift of this sample , where the median sn ia redshift is ( ) . these improvements were rea... | we present new techiques for improving the efficiency of supernova ( sn ) classification at high redshift using 64 candidates observed at gemini north and south during the first year of the supernova legacy survey ( snls ) . the snls is an ongoing five year project with the goal of measuring the equation of state of da... |
astro-ph0509195 | c | we have demonstrated several techniques for improving the yield of spectroscopically identified sne ia at high redshift ( @xmath43 ) . the sn photo - z is shown to effectively screen out non - ia candidates before they are observed spectroscopically . when no photometric redshifts were available , 35% of candidates tur... | the snls is an ongoing five year project with the goal of measuring the equation of state of dark energy by discovering and following over 700 high - redshift sne ia using data from the canada - france - hawaii telescope legacy survey . is found to be host galaxy contamination of the spectrum when the sn was at least ... | we present new techiques for improving the efficiency of supernova ( sn ) classification at high redshift using 64 candidates observed at gemini north and south during the first year of the supernova legacy survey ( snls ) . the snls is an ongoing five year project with the goal of measuring the equation of state of da... |
astro-ph0205389 | i | it is now understood that intrinsic absorption is a common phenomenon in seyfert 1 galaxies , present in more than half of those observed with the spectrographs aboard the _ hubble space telescope ( hst ) _ ( crenshaw et al . 1999 ) . among those seyferts that show absorption , high ionization resonance lines such as n... | the uv continuum was times lower than that observed during 1995 with the goddard high resolution spectrograph ( ghrs ) , and the x - ray flux from a contemporaneous _ chandra x - ray observatory ( cxo ) _ observation was a factor of below that observed with _ we have achieved an acceptable fit to the x - ray data using... | we present observations of the uv absorption lines in the seyfert 1 galaxy ngc 3516 , obtained at a resolution of/ 40,000 with the space telescope imaging spectrograph ( stis ) on 2000 october 1 . the uv continuum was times lower than that observed during 1995 with the goddard high resolution spectrograph ( ghrs ) , an... |
astro-ph0205389 | c | we have shown that our model for the uv absorbers , with the components arranged in increasing radial distance and each covering the continuum source , accurately predicts most of the ionic columns and the x - ray opacity . given the success of the model , we may use it as a starting point to unravel the geometry of th... | four additional absorption components have appeared in the stis spectra at radial velocities of , , , and km s ( components 5 through 8) ; these may also have been present in earlier low - flux states observed by the _ international ultraviolet explorer ( iue)_. based on photoionization models , we suggest that the com... | we present observations of the uv absorption lines in the seyfert 1 galaxy ngc 3516 , obtained at a resolution of/ 40,000 with the space telescope imaging spectrograph ( stis ) on 2000 october 1 . the uv continuum was times lower than that observed during 1995 with the goddard high resolution spectrograph ( ghrs ) , an... |
1505.05289 | i | calculation of the @xmath0 decay amplitudes is very important to quantitatively understand the @xmath1 rule in the decay of the neutral @xmath16 meson system and to theoretically predict the direct @xmath17 violation parameter ( @xmath18 ) from the standard model . a direct lattice qcd calculation of the decay amplitud... | we present our result for the decay amplitudes for both the and processes with the improved wilson fermion action . expanding on the earlier works by bernard _ et al . _ and by donini _ et al . _ our calculations are carried out with gauge configurations generated with the iwasaki gauge action and nonperturbatively-imp... | we present our result for the decay amplitudes for both the and processes with the improved wilson fermion action . expanding on the earlier works by bernard _ et al . _ and by donini _ et al . _ , we show that mixings with four - fermion operators with wrong chirality are absent even for the wilson fermion action for ... |
1505.05289 | c | in the present work we have shown that mixings with four - fermion operators with wrong chirality are absent even for the wilson fermion action for the parity odd process due to cps symmetry . therefore , after subtraction of an effect from the lower dimensional operator , a calculation of the decay amplitudes is possi... | , we show that mixings with four - fermion operators with wrong chirality are absent even for the wilson fermion action for the parity odd process in both channels due to cps symmetry . therefore , after subtraction of an effect from the lower dimensional operator , a calculation of the decay amplitudes is possible wit... | we present our result for the decay amplitudes for both the and processes with the improved wilson fermion action . expanding on the earlier works by bernard _ et al . _ and by donini _ et al . _ , we show that mixings with four - fermion operators with wrong chirality are absent even for the wilson fermion action for ... |
1504.06128 | c | we have obtained precision velocities ( to @xmath33 km / s ) and stellar population parameters ( age , metallicity ) for a sample of 77 star clusters in m33 . our principal findings are : * the m33 disc clusters show a clear age - metallicity relation in the sense that younger clusters are more metal - rich than the... | we present precision radial velocities and stellar population parameters for 77 star clusters in the local group galaxy m33 . the cluster system exhibits an age - metallicity relation ; the youngest clusters are the most metal - rich . when compared to hi data , clusters with [ m / h] and younger than gyr the clusters ... | we present precision radial velocities and stellar population parameters for 77 star clusters in the local group galaxy m33 . our gtc and wht observations sample both young , massive clusters and known / candidate globular clusters , spanning ages yr , and metallicities , [ m / h ] to solar . the cluster system exhibit... |
astro-ph9906259 | c | we have shown the general consequences of a phenomenological two - component @xmath0-process model based on the @xmath1i and @xmath2hf abundances in the early solar system . this model assumes a standard mass of the ism for dilution of the debris from an individual supernova . two scenarios have been investigated to pr... | we present quantitative predictions for the abundances of-process elements in stars formed very early in the galactic history using a phenomenological two - component-process model based on thei andhf inventory in the early solar system . this model assumes that a standard mass of the ism dilutes the debris from an ind... | we present quantitative predictions for the abundances of-process elements in stars formed very early in the galactic history using a phenomenological two - component-process model based on thei andhf inventory in the early solar system . this model assumes that a standard mass of the ism dilutes the debris from an ind... |
astro-ph9906335 | i | rich clusters of galaxies generally contain a diffuse intracluster medium ( icm ) having temperatures @xmath0 k and densities @xmath1 @xmath2 , as inferred from observations at x - ray and other wavebands ( e.g. , ; ) . an important question related to the overall physics of the icm concerns the central regions of cl... | we present results from detailed imaging of the centrally dominant radio elliptical galaxy in the cooling flow cluster abell 2597 , using data obtained with the wide field and planetary camera 2 ( wfpc2 ) on the _ hubble space telescope ( hst)_. this object is one of the archetypal `` blue - lobed '' cooling flow radi... | we present results from detailed imaging of the centrally dominant radio elliptical galaxy in the cooling flow cluster abell 2597 , using data obtained with the wide field and planetary camera 2 ( wfpc2 ) on the _ hubble space telescope ( hst)_. this object is one of the archetypal `` blue - lobed '' cooling flow radi... |
astro-ph0102021 | i | ` normal ' galaxies of all morphological types are known to be x - ray emitters , with luminosities in the soft ( @xmath93.5 kev ) x - ray band ranging from @xmath10 to some @xmath11 ergs s@xmath1 ( fabbiano 1989 ) . despite this band being a relatively small part of the electromagnetic spectrum and the x - ray output... | the rest is due to 26 other x - ray sources ( contributing ) and to apparently diffuse emission , which is seen across much of the galactic disk and is particularly bright in the bulge region around the nucleus . the other one is far off the main body of m81 , but is apparently associated with a dense hi concentratio... | we present results from the analysis of deep hri and pspc observations of the spiral galaxy m81 . the inferred total ( 0.52 kev band ) luminosity of m81 is ergs s , excluding the contribution from identified interlopers found within the ellipse . the nucleus of the galaxy alone accounts for about of this luminosity .... |
astro-ph0102021 | i | we have systematically analyzed pspc and hri observations of the early - type spiral m81 to disentangle different emission components and to derive spatial , spectral and timing characteristics of x - ray sources in the field . the main results and conclusions are as follows : @xmath83 within a region of @xmath36 r... | the nucleus of the galaxy alone accounts for about of this luminosity . we find interesting spatial coincidences of luminous ( ) and variable x - ray sources with shock - heated optical nebulae . three of them are previously classified as supernova remnant candidates . these associations suggest that such optical nebul... | we present results from the analysis of deep hri and pspc observations of the spiral galaxy m81 . the inferred total ( 0.52 kev band ) luminosity of m81 is ergs s , excluding the contribution from identified interlopers found within the ellipse . the nucleus of the galaxy alone accounts for about of this luminosity .... |
astro-ph0609356 | r | in our search for planetary companions we come to the same result as @xcite of no faint companion candidates around g172 - 1 . however , we were easily able to resolve this @xmath388 binary for the first time into two almost equal - magnitude components . this binary was first observed by @xcite in 1999 as part of a tr... | we find that the separation distribution of the binaries in this sample peaks at , which is consistent with previous measurements of early - m binaries . hence , early - m binaries seem to occur in on average tighter systems than g binaries . at the same time | we present results of a high - resolution , near - infrared survey of 41 nearby , young ( ) m0m5.0 dwarfs using the altair natural guide star adaptive optics system at the gemini north telescope . twelve of the objects appear to be binaries , 7 of which are reported here for the first time . one triple system was disco... |
astro-ph0609356 | c | observations of binaries and their inherent parameters are important for setting constraints on the formation mechanism of stars in general . this sample of young , early - m dwarfs allows insight into a population of stars in between the well - known g and k star population and the distinctly different vlm population ... | the distribution of mass ratios of primary and secondary stars was found to show an intermediate distribution between the strongly peaked distribution of field vlm systems and the almost flat distribution of earlier - type stars . consequently , we show evidence for relatively young , early - m binaries representing a ... | we present results of a high - resolution , near - infrared survey of 41 nearby , young ( ) m0m5.0 dwarfs using the altair natural guide star adaptive optics system at the gemini north telescope . twelve of the objects appear to be binaries , 7 of which are reported here for the first time . one triple system was disco... |
astro-ph0609356 | i | we have conducted a survey of 41 nearby , early - m stars of ages comparable to the pleiades cluster , searching for companions down to planetary masses using the gemini north telescope with its ao system altair . thirteen stars were observed to host fairly bright companions , 8 of these multiples ( 7 binaries , 1 trip... | we present results of a high - resolution , near - infrared survey of 41 nearby , young ( ) m0m5.0 dwarfs using the altair natural guide star adaptive optics system at the gemini north telescope . statistical properties are studied and compared with earlier ( f to k ) and later ( m6 very low - mass , vlm ) populations ... | we present results of a high - resolution , near - infrared survey of 41 nearby , young ( ) m0m5.0 dwarfs using the altair natural guide star adaptive optics system at the gemini north telescope . twelve of the objects appear to be binaries , 7 of which are reported here for the first time . one triple system was disco... |
astro-ph0211189 | i | the large absorption line red shift measurements settled the issue that most @xmath0-ray bursts are at cosmological distances . the physical mechanism of the origin of the @xmath0-ray bursts , questions of whether there are more than one mechanism , and the issue of whether @xmath0-ray bursts interact only with the i... | we delineate six components in the medium surrounding the-ray burst along the line of sight : ( 1 ) the absorption lines arise from the innermost region closest to the burst , where the ionization will be highest and the 3000 km s velocity comes from the intrinsic velocity of a massive star wind boosted by accelerat... | we present spectra of the optical transient of grb 021004 obtained with the hobby - eberly telescope starting 15.48 , 20.31 hours , and 4.84 days after the-ray burst and a spectrum obtained with the h. j. smith 2.7 m telescope starting 14.31 hours after the-ray burst . grb 021004 is the first burst afterglow for whi... |
astro-ph0211189 | c | the grb 021004 spectrum displays high - ionization and high - velocity absorption lines . we argue that these lines are likely to have arisen from shells of gas around the progenitor star , and further , that these shells plausibly come from a progenitor that was descended from a massive star . the gas in these shells... | we argue that these absorption lines are likely to come from shells around a massive progenitor star . we also analyze the broad - band spectrum and the light curve so as to distinguish the structure of gas within 0.3 pc of the burster . , this component also provides the external medium with which the jet collides ove... | we present spectra of the optical transient of grb 021004 obtained with the hobby - eberly telescope starting 15.48 , 20.31 hours , and 4.84 days after the-ray burst and a spectrum obtained with the h. j. smith 2.7 m telescope starting 14.31 hours after the-ray burst . grb 021004 is the first burst afterglow for whi... |
astro-ph0610135 | r | in [ sys ] we discuss possible sources of systematic error both in the measurements from the x - ray data and the theoretical predictions . possible systematic errors affecting the x - ray mass measurements of our sample of relaxed galaxies and clusters are expected to be small and do not change the conclusions of the... | a power - law model fitted to the x - ray relation requires at high significance ( ) that decreases with increasing , which is a general feature of cdm models . the median and scatter of the relation produced by the flat , concordance model ( , ) agrees with the x - ray data provided the sample is comprised of the mos... | we present the concentration ()-virial mass ( ) relation of 39 galaxy systems ranging in mass from individual early - type galaxies up to the most massive galaxy clusters , . we selected for analysis the most relaxed systems possessing the highest quality data currently available in the _ chandra _ and _ xmm _ public... |
astro-ph0610135 | c | we present the concentration ( @xmath0)-virial mass ( @xmath1 ) relation of 39 galaxy systems ranging in mass from individual early - type galaxies up to the most massive galaxy clusters , @xmath2 . we selected for analysis the most relaxed systems possessing the highest quality data currently available in the _ chandr... | we present the concentration ()-virial mass ( ) relation of 39 galaxy systems ranging in mass from individual early - type galaxies up to the most massive galaxy clusters , . we selected for analysis the most relaxed systems possessing the highest quality data currently available in the _ chandra _ and _ xmm _ public... | we present the concentration ()-virial mass ( ) relation of 39 galaxy systems ranging in mass from individual early - type galaxies up to the most massive galaxy clusters , . we selected for analysis the most relaxed systems possessing the highest quality data currently available in the _ chandra _ and _ xmm _ public... |
1308.4323 | c | images of the densest 11 square degrees of the sgr dsph at @xmath18 , @xmath16 and @xmath37 were compiled into a catalogue of 2921920 sources , and cross - matched to other major optical and infrared catalogues in the literature . this catalogue was used to confirm the properties of the sgr dsph and the foreground gala... | these are consistent with the previously - reported properties of the sgr dsph core : namely that it is dominated by a population between [ fe / h ] 1 dex and solar , with a significant [/fe ] versus [ fe / h ] gradient . we find slight evidence to confirm a metallicity gradient in the sgr dsph and use isochrones to fi... | we present the deepest near - infrared ( ) photometry yet obtained of the sagittarius dwarf spheroidal ( sgr dsph ) , using vista to survey 11 square degrees centred on its core . we list locations and-band magnitudes for over 2.9 million sources in the field . we discuss the isolation of the sgr dsph from the foregrou... |
astro-ph0210645 | i | one of the major thrusts in modern cosmology is an accurate census of star formation and star - forming galaxies in the universe . this endeavor forms the backbone for a slew of methods ( observational , analytical , and numerical ) to study the process of galaxy formation and evolution over cosmic time . to date , sta... | all observations were undertaken months to years after the grb explosions to ensure negligible contamination from the afterglows . this possibly indicates that the stellar populations in the grb hosts are on average younger , supporting the massive stellar progenitor scenario for grbs , but it is also possible that grb... | we present the first comprehensive search for submillimeter and radio emission from the host galaxies of twenty well - localized-ray bursts ( grbs ) . with the exception of a single source , all observations were undertaken months to years after the grb explosions to ensure negligible contamination from the afterglows ... |
astro-ph0210645 | c | we presented the most comprehensive scuba , vla , and atca observations of grb host galaxies to date . the host galaxy of is the only source detected with high significance in both the sub - mm and radio , while the host galaxy of grb000210 is detected with @xmath255 in the sub - mm when we combine our observations wit... | we present the first comprehensive search for submillimeter and radio emission from the host galaxies of twenty well - localized-ray bursts ( grbs ) . with the exception of a single source , we detect the host galaxy of grb000418 in both the sub - mm and radio , and the host galaxy of grb000210 only in the sub - mm . t... | we present the first comprehensive search for submillimeter and radio emission from the host galaxies of twenty well - localized-ray bursts ( grbs ) . with the exception of a single source , all observations were undertaken months to years after the grb explosions to ensure negligible contamination from the afterglows ... |
astro-ph0308388 | i | in this paper we present the results of an unbiased interferometric survey of the star forming disk of m33 in co(1@xmath2110 ) ; the observations were done using the bima array . the 50 pc linear resolution of our survey map is comparable to the size of most gmcs . we derive a catalog of gmcs for m33 complete down to 1... | the diameter synthesized beam corresponds to a linear resolution of 50 pc , sufficient to distinguish individual giant molecular clouds ( gmcs ) . from these data we generated a catalog of 148 gmcs with an expectation that no more than 15 of the sources are spurious . single dish observations of co in selected fields ... | we present the first interferometricco ( ) map of the entire disk of m33 . the diameter synthesized beam corresponds to a linear resolution of 50 pc , sufficient to distinguish individual giant molecular clouds ( gmcs ) . from these data we generated a catalog of 148 gmcs with an expectation that no more than 15 of... |
0904.0251 | i | recent theoretical and observational studies have provided strong evidence suggesting a connection between supermassive black hole ( smbh ) growth and galaxy evolution ( e.g. , * ? ? ? * ; * ? ? ? * ; * ? ? ? * ; * ? ? ? * ) . to better understand this connection , we need more direct measurements of smbh masses across... | we present the first results from a high sampling rate , multi - month reverberation mapping campaign undertaken primarily at mdm observatory with supporting observations from telescopes around the world . the primary goal of this campaign was to obtain either new or improved h reverberation lag measurements for sever... | we present the first results from a high sampling rate , multi - month reverberation mapping campaign undertaken primarily at mdm observatory with supporting observations from telescopes around the world . the primary goal of this campaign was to obtain either new or improved h reverberation lag measurements for sever... |
0904.0251 | r | our measured h@xmath0 lag of @xmath46 days from this work is consistent , within the errors , to the most recent results for this object by s03 , who measured a lag of @xmath47 days . it is not clear how meaningful a direct comparison might be , however , because s03 measured the time delay between variations in the @... | we feature results for ngc 4051 here because , until now , this object has been a significant outlier from agn scaling relationships , e.g. , it was previously a outlier on the relationship between the broad - line region ( blr ) radius and the optical continuum luminosity the relationship . our new measurements of t... | we present the first results from a high sampling rate , multi - month reverberation mapping campaign undertaken primarily at mdm observatory with supporting observations from telescopes around the world . the primary goal of this campaign was to obtain either new or improved h reverberation lag measurements for sever... |
astro-ph9709249 | c | we have presented the geometric optics for refraction by an interstellar plasma lens , with specific application to a lens with gaussian profile of free electron column density . we have shown that the one - dimensional refractive properties of a lens can be characterized completely by two dimensionless parameters . th... | we present the geometrical optics for refraction of a distant background radio source by an interstellar plasma lens , with specific application to a lens with a gaussian profile of free electron column density . the refractive properties of the lens are specified completely by a dimensionless parameter , , which is a ... | we present the geometrical optics for refraction of a distant background radio source by an interstellar plasma lens , with specific application to a lens with a gaussian profile of free electron column density . the refractive properties of the lens are specified completely by a dimensionless parameter , , which is a ... |
1602.05383 | i | the connection between o(@xmath3 ) quantum - rotor ( qr ) and spin models on has proved very useful in the context of phase transitions @xcite . about three decades ago , hamer , kogut and susskind @xcite mapped o(@xmath3 ) heisenberg models onto the corresponding [ ( 1 + 1 ) spatial and time dimensions ] nonlinear - s... | we present the ground state phase diagram of quantum - rotor chains with competing interactions ( frustration ) calculated through cluster variational mean field approaches . we consider two interaction patterns , named f and f models , between the quantum - rotor momentum and position operators , which follow exchange... | we present the ground state phase diagram of quantum - rotor chains with competing interactions ( frustration ) calculated through cluster variational mean field approaches . we consider two interaction patterns , named f and f models , between the quantum - rotor momentum and position operators , which follow exchange... |
0912.2748 | i | we have presented the results of _ spitzer _ irs infrared 535 @xmath0 m low - resolution ( r @xmath2 100 ) spectroscopy of 17 nearby ulirgs at @xmath1 0.2 , optically classified as non - seyferts ( liners , hii - regions , and unclassified , i.e. , no optical agn signatures ) . optically elusive , but intrinsically lum... | we present the results of _ spitzer _ irs low - resolution infrared 535 m spectroscopy of 17 nearby ulirgs at 0.2 , optically classified as non - seyferts . the presence of optically elusive , but intrinsically luminous , buried agns is investigated , based on the strengths of polycyclic aromatic hydrocarbon emission a... | we present the results of _ spitzer _ irs low - resolution infrared 535 m spectroscopy of 17 nearby ulirgs at 0.2 , optically classified as non - seyferts . the presence of optically elusive , but intrinsically luminous , buried agns is investigated , based on the strengths of polycyclic aromatic hydrocarbon emission a... |
astro-ph0510299 | i | despite the recent extraordinary progress in observational cosmology and the successful convergence on a single cosmological model , galaxy formation and evolution largely remain an open issue . one critical aspect is how and when the present - day most massive galaxies ( e.g. elliptical galaxies and bulges with @xmath... | we accurately measure surface densities of arcmin and arcmin for the and the , respectively . both and are strongly clustered , at a level at least comparable to that of eros , with appearing more clustered than . we estimate the reddening , star formation rates ( sfrs ) and stellar masses ( ) for the ensemble of ,... | we present the results of a deep , wide - area , optical and near - ir survey of massive high - redshift galaxies . the prime focus camera ( suprime - cam ) on the subaru telescope was used to obtain imaging over arcmin fields , while imaging was provided by the sofi camera at the new technology telescope ( ntt ) for a... |
astro-ph0510299 | i | this paper presents the results of a survey based on @xmath93 photometry obtained by combining subaru optical and eso near - ir data over two separate fields ( deep3a - f and daddi - f ) . complete k - selected samples of galaxies were selected to @xmath84 in the deep3a - f over 320 arcmin@xmath2 , and to @xmath118 in ... | we present the results of a deep , wide - area , optical and near - ir survey of massive high - redshift galaxies . the selection technique was used to assemble complete samples of about 500 candidate massive star - forming galaxies ( ) and about 160 candidate massive passively evolving galaxies ( ) at ; and the color ... | we present the results of a deep , wide - area , optical and near - ir survey of massive high - redshift galaxies . the prime focus camera ( suprime - cam ) on the subaru telescope was used to obtain imaging over arcmin fields , while imaging was provided by the sofi camera at the new technology telescope ( ntt ) for a... |
1301.5368 | r | in assessing the many periods found in the period search , we used several criteria . first , periods identified using more than one technique were considered more robust detections . second , periods detected in both h@xmath1 and he i were of interest because of the possible wind - photosphere connection . third , we ... | a periodicity search was carried out on the equivalent width and radial velocity data , as well as on wavelength - binned spectra . , stellar pulsations may be the origin of some of the observed variability . periods on the order of the rotational period were also detected in the he i line in the 98 - 99 season and in ... | we present the results of a time - series analysis of 130 chelle spectra of ori ( b0 ia ) , acquired over seven observing seasons between 1998 and 2006 at ritter observatory . the equivalent widths of h ( net ) and he i were measured and radial velocities were obtained from the central absorption of he i . temporal var... |
1301.5368 | i | the line profile variability of the h@xmath1 and he i @xmath25876 lines in the supergiant @xmath0 ori has been examined through time - series analysis of spectra from seven seasons of observations . this star has a strong and variable stellar wind , as demonstrated by its highly variable h@xmath1 line which is observed... | the he i tvs have a double - peaked profile consistent with radial velocity oscillations . many of these periods exhibit sinusoidal modulation in the associated phase diagrams . several of these periods were present in both h and he i , indicating a possible connection between the wind and the photosphere . due to the ... | we present the results of a time - series analysis of 130 chelle spectra of ori ( b0 ia ) , acquired over seven observing seasons between 1998 and 2006 at ritter observatory . the equivalent widths of h ( net ) and he i were measured and radial velocities were obtained from the central absorption of he i . temporal var... |
1001.0750 | r | one of the advantages of x - ray spectroscopy with high signal - to - noise characteristics is the availability of numerous line ratio diagnostics to assess conditions in the radiating plasma . in particular , he - like systems provide valuable diagnostic opportunity , as discussed extensively in the literature ( porqu... | the presence of , , and emission lines in the spectrum requires coronal structures at mk . lower temperature lines ( e.g. , from , , and ) formed at 2.5 mk appear more consistent with emission from an accretion shock . he - like line ratio diagnostics indicate thatmk and in the shock . these values agree well with sta... | we present x - ray spectral analysis of the accreting young star tw hydrae from a 489 ks observation using the _ chandra _ high energy transmission grating . the spectrum provides a rich set of diagnostics for electron temperature , electron density , hydrogen column density , relative elemental abundances and velocit... |
1001.0750 | i | we have analyzed the deep _ chandra _ hetg spectrum of tw hya to assess the relative contributions of accretion and coronal emission . we summarize the most important of our findings : * the spectrum shows line and continuum emission from @xmath128 mk coronal plasma , which may have a broad emission measure distr... | the spectrum provides a rich set of diagnostics for electron temperature , electron density , hydrogen column density , relative elemental abundances and velocities and reveals its source in 3 distinct regions of the stellar atmosphere : the stellar corona , the accretion shock , and a very large extended volume of war... | we present x - ray spectral analysis of the accreting young star tw hydrae from a 489 ks observation using the _ chandra _ high energy transmission grating . the spectrum provides a rich set of diagnostics for electron temperature , electron density , hydrogen column density , relative elemental abundances and velocit... |
astro-ph0307322 | c | the measured angular momenta are significantly less than expected from simple theories of cloud formation . in the absence of external forces , the angular momentum of a molecular cloud should be equal to the angular momentum of the gas from which it formed . in a shearing galactic disk , the initial angular momentum f... | we place upper limits on the specific angular momentum of the gmcs and find the observed values to be nearly an order of magnitude below the values predicted from simple formation mechanisms . these observations suggest that molecular clouds form locally out of atomic gas with significant braking by magnetic fields to ... | we presentco observations of 45 giant molecular clouds in m33 made with the bima array . the observations have a linear resolution of 20 pc , sufficient to measure the sizes of most gmcs in the sample . we place upper limits on the specific angular momentum of the gmcs and find the observed values to be nearly an order... |
1012.3561 | c | in the preceding section we have described the important features of the boundary energy density @xmath159 induced by a relativistic coiling string in the bulk . we proposed approximating this by a superposition of gravitational shock waves produced by each string bit we dubbed this the ` beaming mechanism ' and calc... | in particular , we offer a heuristic explanation of the collimated nature of synchrotron radiation produced by a circling quark , which was recently studied in phys.rev.*d81 * ( 2010 ) 126001 . dcpt-10/75 * holographic dual of collimated radiation * veronika e. hubeny + _ science laboratories , south road , ... | we propose a new and simple method of estimating the radiation due to an accelerated quark in a strongly coupled medium , within the framework of the ads / cft correspondence . in particular , we offer a heuristic explanation of the collimated nature of synchrotron radiation produced by a circling quark , which was rec... |
1111.4599 | i | the term hydraulic jump " refers to the sudden jump in fluid height , as for example observed in the outward spreading water layer in a kitchen sink , resulting from the impact of the water from the tap with the horizontal bottom of the sink @xcite . similar phenomena are seen in rivers with large tidal variation at t... | we propose a phenomenological model for the polygonal hydraulic jumps discovered by ellegaard _ et al . _ , based on the known flow structure for the type ii hydraulic jumps with a `` roller '' ( separation eddy ) near the free surface in the jump region . a truncated , but fully nonlinear version of the model can be s... | we propose a phenomenological model for the polygonal hydraulic jumps discovered by ellegaard _ et al . _ , based on the known flow structure for the type ii hydraulic jumps with a `` roller '' ( separation eddy ) near the free surface in the jump region . the model consists of mass conservation and radial force balanc... |
hep-ph0011306 | c | we have worked out a simple and accurate prescription to calculate the solar neutrino survival probability @xmath0 in the quasivacuum oscillation regime . such prescription adapts the known analytical solution for the exponential case to the true density case , as well as to the perturbative solution of neutrino evolut... | we propose a simple prescription to calculate the solar neutrino survival probability in the quasivacuum oscillation ( qvo ) regime . the resulting analytical recipe for the calculation of is shown to reach its highest accuracy ( in the whole qvo range ) when the familiar prescription of choosing the solar density scal... | we propose a simple prescription to calculate the solar neutrino survival probability in the quasivacuum oscillation ( qvo ) regime . such prescription is obtained by matching perturbative and exact analytical results , which effectively take into account the density distribution in the sun as provided by the standard ... |
1512.05054 | i | multifractional brownian motion ( mbm ) is considered as one of the most natural extensions of fractional brownian motion ( fbm ) . nowadays applications of mbm are numerous and growing . similar to fbm , mbm has been used in such diverse areas as geology , image analysis , signal processing , traffic networks and math... | we propose a wavelet - based approach to construct consistent estimators of the pointwise hlder exponent of a multifractional brownian motion , in the case where this underlying process is not directly observed . the relative merits of our estimator are discussed , and we introduce an application to the problem of esti... | we propose a wavelet - based approach to construct consistent estimators of the pointwise hlder exponent of a multifractional brownian motion , in the case where this underlying process is not directly observed . the relative merits of our estimator are discussed , and we introduce an application to the problem of esti... |
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