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1005.3619 | c | we have derived fe abundances via an ew analysis of and lines in high - resolution and moderate - s / n spectra of 16 ms dwarfs in the pleiades open cluster . the [ /h ] abundances increase dramatically relative to [ /h ] at @xmath0 below 5400 k , with the difference reaching over 0.8 dex in the coolest stars . this... | we have derived fe abundances of 16 solar - type pleiades dwarfs by means of an equivalent width analysis of and lines in high - resolution spectra obtained with the hobby - eberly telescope and high resolution spectrograph . curiously , a correlation between the pleiades abundances and chromospheric emission indicator... | we have derived fe abundances of 16 solar - type pleiades dwarfs by means of an equivalent width analysis of and lines in high - resolution spectra obtained with the hobby - eberly telescope and high resolution spectrograph . abundances derived from lines are larger than those derived from lines ( herein referred to as... |
astro-ph0502575 | c | it is conventional to believe ( e.g. leahy 1993 ) that the jets of wat sources are physically similar to those in classical double ( frii ) radio galaxies and quasars ; evidence for this comes from their narrow and sometimes one - sided appearance ( as in 3c465 ) , the polarization structure they exhibit and their freq... | chandra _ and _ xmm - newton_. x - ray emission is detected from the active nucleus and the inner radio jet , as well as a small - scale , cool component of thermal emission , a number of the individual galaxies of the host cluster ( abell 2634 ) , and the hotter thermal emission from the cluster itself . the x - ray d... | we have observed the prototypical wide - angle tail radio galaxy 3c465 with _ chandra _ and _ xmm - newton_. x - ray emission is detected from the active nucleus and the inner radio jet , as well as a small - scale , cool component of thermal emission , a number of the individual galaxies of the host cluster ( abell 26... |
astro-ph0502575 | c | our principal results can be summarized as follows : 1 . the detection of x - ray emission from the inner part of the jet of 3c465 adds significantly to the evidence that fast ( at least mildly relativistic ) , efficient , frii - like ( ` type 2 ' ) jets can be sources of x - ray synchrotron radiation . 2 . the ... | although the wat jet - plume transition appears likely to be related to the interface between this central cool component and the hotter intra - cluster medium , the mechanism for wat formation remains unclear . we revisit the question of the bending of wat plumes , and show that the plumes can be bent by plausible bul... | we have observed the prototypical wide - angle tail radio galaxy 3c465 with _ chandra _ and _ xmm - newton_. x - ray emission is detected from the active nucleus and the inner radio jet , as well as a small - scale , cool component of thermal emission , a number of the individual galaxies of the host cluster ( abell 26... |
astro-ph0412501 | i | cataclysmic variables ( cvs ) are interacting binary systems in which a white dwarf ( wd ) accretes matter from a low - mass companion . in non - magnetic cvs , the in - falling matter forms a disk around the wd . dwarf novae ( dne ) are disk - accreting cvs that undergo sharp rises in luminosity , during which the opt... | a second component could be due to a rotating accretion belt , a remnant of an outburst that ended eleven days prior to the observation , or ongoing accretion . we have compared the quiescent spectrum with an archival spectrum of z cam in standstill , obtained with . | we have obtained _ far ultraviolet spectroscopic explorer _ ( 9051187 ) spectra of the non - magnetic cataclysmic variable z cam during a period of quiescence . the spectrum resembles that of a hot ( 57,000k ) metal - enriched white dwarf . a high effective temperature is consistent with the expectation that dwarf nov... |
astro-ph0412501 | c | in quiescence , we find that the fuv continuum of z cam as observed by is qualitatively well - described in terms of emission from a hot metal - enriched wd atmosphere . for log g=8.5 , the best fit single temperature models has a of 57,200 k and of . the mass of the wd in z cam is estimated to be 0.99@xmath620.15 ,... | the spectrum resembles that of a hot ( 57,000k ) metal - enriched white dwarf . a high effective temperature is consistent with the expectation that dwarf nova systems that show standstills , as z cam does , have higher than normal time - averaged mass accretion rates . it is also consistent with current estimates for ... | we have obtained _ far ultraviolet spectroscopic explorer _ ( 9051187 ) spectra of the non - magnetic cataclysmic variable z cam during a period of quiescence . the spectrum resembles that of a hot ( 57,000k ) metal - enriched white dwarf . a high effective temperature is consistent with the expectation that dwarf nov... |
astro-ph0412501 | c | we have obtained observations with the satellite of the dwarf nova , z cam , during a period of quiescence . the spectrum is characterized by a fairly flat continuum , with a peak in the flux at 1000 . the line spectrum covers a broad range of atomic species and ionization stages and is dominated by absorption lines o... | we have obtained _ far ultraviolet spectroscopic explorer _ ( 9051187 ) spectra of the non - magnetic cataclysmic variable z cam during a period of quiescence . we favor the uniform temperature model for z cam , largely because the data do not require anything more complicated . the standstill spectrum is described we... | we have obtained _ far ultraviolet spectroscopic explorer _ ( 9051187 ) spectra of the non - magnetic cataclysmic variable z cam during a period of quiescence . the spectrum resembles that of a hot ( 57,000k ) metal - enriched white dwarf . a high effective temperature is consistent with the expectation that dwarf nov... |
astro-ph0304371 | i | galaxies in dense clusters evolve mainly due to tidal interactions , mergers and ram pressure stripping with accretion contributing to the buildup of the cd galaxies that often reside at the bottom of the cluster potential ( dressler 1984 ) . these processes are expected to be most effective in the cluster cores where... | we have obtained new optical imaging and spectroscopic observations of 78 galaxies in the fields of the rich clusters abell 1413 ( ) , abell 2218 ( ) and abell 2670 ( ) . we have combined these data with our previous observations of abell 2029 and abell 2295 ( both at ) , which yields a sample of 156 galaxies . | we have obtained new optical imaging and spectroscopic observations of 78 galaxies in the fields of the rich clusters abell 1413 ( ) , abell 2218 ( ) and abell 2670 ( ) . we have detected line emission from 25 cluster galaxies plus an additional six galaxies in the foreground and background , a much lower success r... |
astro-ph0304371 | c | the goal of this survey is to investigate the impact that the intracluster medium has on galaxies residing in a range of cluster environments at @xmath94 . a total of 156 galaxies were observed spectroscopically in five clusters ranging from rich , x - ray luminous systems to richness class 0 clusters undetected in x... | we evaluate several parameters as a function of cluster environment : tully - fisher residuals , equivalent width , and rotation curve asymmetry , shape and extent . although is more easily detectable in galaxies that are located further from the cluster cores , we fail to detect a correlation between extent and gal... | we have obtained new optical imaging and spectroscopic observations of 78 galaxies in the fields of the rich clusters abell 1413 ( ) , abell 2218 ( ) and abell 2670 ( ) . we have detected line emission from 25 cluster galaxies plus an additional six galaxies in the foreground and background , a much lower success r... |
astro-ph0303275 | i | we have presented high - sensitivity images of the isolated , edge - on , ` superthin ' spiral galaxy ugc 7321 with a resolution of 24.4 khz and a total bandwidth of 3.052 mhz ( 125 channels ) . in the optical , ugc 7321 exhibits a diffuse stellar disk with little dust obscuration , an extremely small global scal... | we have used the very large array to image the isolated `` superthin '' galaxy ugc 7321 in the line with a spatial resolution of 16 and a spectral resolution of 24 khz ( 5.2 ) . ugc 7321 has a gas - rich disk with d and ( d is the distance to ugc 7321 in units of 10 mpc , the value adopted in this paper ) , an... | we have used the very large array to image the isolated `` superthin '' galaxy ugc 7321 in the line with a spatial resolution of 16 and a spectral resolution of 24 khz ( 5.2 ) . we have reached a sensitivity of ( 0.36 0.40 ) mjy / beam per channel , which correspond to a column density of ( 8 9) atoms ( ) . ug... |
1409.8576 | i | in many applications from a wide variety of fields , the data to be processed can partially ( or even almost completely ) be affected by severe noise in several phases , e.g. , occlusions during a visual recording or packet losses during transmission in a communication channel . the partial , i.e. , localized , corrupt... | once each part is labeled as anomalous vs normal , the corresponding binary patterns over this tree that characterize corruptions are identified and the affected attributes are imputed . under a certain conditional independency structure assumed for the binary patterns , localized corruption , occlusion , map based imp... | we introduce a comprehensive and statistical framework in a model free setting for a complete treatment of localized data corruptions due to severe noise sources , e.g. , an occluder in the case of a visual recording . within this framework , we propose i ) a novel algorithm to efficiently separate , i.e. , detect and ... |
1409.8576 | c | in this paper , we proposed a comprehensive framework for handling localized and severe data corruptions . the novel contributions of the proposed framework includes ( i ) a first algorithm to jointly detect and localize such corruptions by identifying the local anomalies , ( ii ) a _ maximum a posteriori _ based estim... | , we propose i ) a novel algorithm to efficiently separate , i.e. , detect and localize , possible corruptions from a given suspicious data instance and ii ) a _ maximum a posteriori _ ( map ) estimator to impute the corrupted data . as a generalization to euclidean distance the proposed framework is tested over severa... | we introduce a comprehensive and statistical framework in a model free setting for a complete treatment of localized data corruptions due to severe noise sources , e.g. , an occluder in the case of a visual recording . within this framework , we propose i ) a novel algorithm to efficiently separate , i.e. , detect and ... |
cond-mat0001235 | i | the microscopic understanding of the effect of charge carrier doping on spin@xmath0 antiferromagnetic ( afm ) mott insulators is the central issue of the high - temperature superconducting cuprates . @xcite many puzzling experimental features of these systems @xcite suggest that a fundamental law of nature remains to b... | the magnetic exchange energy of the distorted afm background leads to a logarithmic vortex - antivortex attraction which overcomes the direct coulomb repulsion between holes localized on the vortex cores . the ci method systematically describes fluctuation and quantum tunneling corrections to the hartree - fock approxi... | we investigate a microscopic model for strongly correlated electrons with both on - site and nearest neighbor coulomb repulsion on a 2d square lattice . this exhibits a state in which electrons undergo a `` somersault '' in their internal spin - space ( spin - flux ) as they traverse a closed loop in external coordinat... |
cond-mat0001235 | r | the configuration interaction method utilizes a linear combination of judiciously chosen hartree - fock wavefunctions.@xcite in this section , we provide a short review of the relevant hartree - fock results for the spin - flux model . a full comparison between the hfa for the spin - flux model and the conventional hub... | we use the configuration interaction ( ci ) method to study the quantum translational and rotational motion of various charged magnetic solitons and soliton pairs . we find that the lowest energy charged meron - antimeron pairs exhibit d - wave rotational symmetry , consistent with the symmetry of the cuprate supercond... | we investigate a microscopic model for strongly correlated electrons with both on - site and nearest neighbor coulomb repulsion on a 2d square lattice . this exhibits a state in which electrons undergo a `` somersault '' in their internal spin - space ( spin - flux ) as they traverse a closed loop in external coordinat... |
cond-mat0001235 | m | the essence of the configuration interaction ( ci ) method is that the ground - state wavefunction , for a system with @xmath61 electrons , is not represented by just a single @xmath107 slater determinant ( as in the hfa ) , but a judiciously chosen linear combination of such slater determinants . @xcite given the fact... | when this spin-1/2 antiferromagnetic ( afm ) insulator is doped , the ground state is a liquid of charged , bosonic meron - vortices , which for topological reasons are created in vortex - antivortex pairs . this model provides a unified microscopic basis for ( i ) non - fermi - liquid transport properties , ( ii ) d -... | we investigate a microscopic model for strongly correlated electrons with both on - site and nearest neighbor coulomb repulsion on a 2d square lattice . this exhibits a state in which electrons undergo a `` somersault '' in their internal spin - space ( spin - flux ) as they traverse a closed loop in external coordinat... |
1108.2281 | i | in this paper we begin the systematic study of legendrian graphs in @xmath6 with the standard contact structure . these are embedded graphs that are everywhere tangent to the contact planes . legendrian graphs have appeared naturally in several important contexts in the study of contact manifolds . they are used in gir... | we investigate legendrian graphs in . we extend the classical invariants , thurston - bennequin number and rotation number to legendrian graphs . we prove that a graph can be legendrian realized with all its cycles legendrian unknots with and if and only if it does not contain as a minor . | we investigate legendrian graphs in . we extend the classical invariants , thurston - bennequin number and rotation number to legendrian graphs . we prove that a graph can be legendrian realized with all its cycles legendrian unknots with and if and only if it does not contain as a minor . we show that the pair does no... |
1106.4320 | c | we have investigated signals of nucleon destruction that can arise in specific theories where dark matter is antibaryonic . antibaryonic dm is motivated by unified mechanisms for dm and baryon generation ( referred to as hylogenesis ) which address the cosmic coincidence between the energy densities of dark and visible... | we investigate new and unusual signals that arise in theories where dark matter is asymmetric and carries a net antibaryon number , as may occur when the dark matter abundance is linked to the baryon abundance . these processes lead to an effective nucleon lifetime of years in terrestrial nucleon decay experiments , if... | we investigate new and unusual signals that arise in theories where dark matter is asymmetric and carries a net antibaryon number , as may occur when the dark matter abundance is linked to the baryon abundance . antibaryonic dark matter can cause _ induced nucleon decay _ by annihilating visible baryons through inelast... |
0801.3305 | r | figure [ fig:4 ] shows the gas structure around the hill sphere for model m04 at @xmath186 . figure [ fig:4 ] left panel shows the structure on the cross section in the @xmath187 plane , in which red lines indicate the streamlines . in this panel , the gas enters @xmath188 grid from upper @xmath83 boundary for @xmath... | we find that the gas flows onto the protoplanet system in the vertical direction crossing the shock front near the hill radius of the protoplanet , which is qualitatively different from the picture established by two - dimensional simulations . the specific angular momentum of the gas accreted by the protoplanet system... | we investigate the accretion of angular momentum onto a protoplanet system using three - dimensional hydrodynamical simulations . we consider a local region around a protoplanet in a protoplanetary disk with sufficient spatial resolution . we describe the structure of the gas flow onto and around the protoplanet in det... |
1601.07675 | i | the complex behavior of mixtures of bosonic gases has been extensively investigated experimentally in particular , in cold - atom systems @xcite and theoretically @xcite . these systems exhibit a rich behavior , at zero and finite temperature , with several different phases separated by transition lines , along whic... | we study the phase diagram and the critical behaviors along the transition lines characterized by the bose - einstein condensation of one or both species . we present mean - field calculations and numerical finite - size scaling analyses of quantum monte carlo data . we determine the possible multicritical behaviors by... | we investigate the bose - einstein condensation patterns , the critical and multicritical behaviors of three - dimensional mixtures of bosonic gases with short - range density - density interactions . these systems have a global u(1)u(1 ) symmetry , as the system hamiltonian is invariant under independent u(1 ) transfo... |
1601.07675 | c | in this paper we study the critical and multicritical behaviors that can be observed in 3d mixtures of bosonic gases interacting by short - range density - density interactions . these systems have a global u(1)@xmath0u(1 ) symmetry , related to independent u(1 ) transformations acting on each species . as a representa... | we investigate the bose - einstein condensation patterns , the critical and multicritical behaviors of three - dimensional mixtures of bosonic gases with short - range density - density interactions . these systems have a global u(1)u(1 ) symmetry , as the system hamiltonian is invariant under independent u(1 ) transfo... | we investigate the bose - einstein condensation patterns , the critical and multicritical behaviors of three - dimensional mixtures of bosonic gases with short - range density - density interactions . these systems have a global u(1)u(1 ) symmetry , as the system hamiltonian is invariant under independent u(1 ) transfo... |
1308.1094 | l | [ sec : studies ] in this section we develop collider analyses aimed at reconstructing the @xmath30 angle in ( [ eq : thetadef ] ) . from ( [ eq : matrix_element : full ] ) and ( [ eq : greatformula ] ) , the matrix element squared for the @xmath224 decay has a term proportional to @xmath225 : the @xmath30 distribut... | we investigate the lhc and higgs factory prospects for measuring the phase in the higgs-- coupling a new , ideal observable is identified from an analytic calculation for the channel . it is demonstrated to have promising sensitivity at the lhc and superior sensitivity at the ilc compared to previous proposals . it is ... | we investigate the lhc and higgs factory prospects for measuring the phase in the higgs-- coupling . currently this phase can be anywhere between ( even ) and ( odd ) . a new , ideal observable is identified from an analytic calculation for the channel . it is demonstrated to have promising sensitivity at the lhc and s... |
1503.04578 | i | let @xmath4 be some closed orientable surface , bordering a compact inner @xmath5 and outer @xmath6 domains . by @xmath7 we denote a subsurface of @xmath8 , which has two faces @xmath9 and @xmath10 and inherits the orientation from @xmath8 : @xmath10 borders the inner domain @xmath5 and @xmath9 borders the outer domain... | we investigate the mixed dirichlet - neumann boundary value problems for the laplace - beltrami equation on a smooth bounded surface with a smooth boundary in non - classical setting in the bessel potential space for , . to the initial bvp we apply a quasi - localization and obtain a model bvp for the laplacian . mce i... | we investigate the mixed dirichlet - neumann boundary value problems for the laplace - beltrami equation on a smooth bounded surface with a smooth boundary in non - classical setting in the bessel potential space for , . to the initial bvp we apply a quasi - localization and obtain a model bvp for the laplacian . the m... |
hep-lat0103026 | c | in this paper , we have studied the @xmath56 improvement of wilson quarks on anisotropic lattices . at the tree - level we find that a certain choice of the parameters , @xmath82 @xcite , is well - behaved in the region of practical interest for charmed hadrons , namely @xmath222 , while @xmath223 is small . on the ot... | we investigate the symanzik improvement of the wilson quark action on anisotropic lattices . taking first a general action with nearest - neighbor and clover interactions , we study the mass dependence of the ratio of the hopping parameters , the clover coefficients , and an improvement coefficient for heavy - light ve... | we investigate the symanzik improvement of the wilson quark action on anisotropic lattices . taking first a general action with nearest - neighbor and clover interactions , we study the mass dependence of the ratio of the hopping parameters , the clover coefficients , and an improvement coefficient for heavy - light ve... |
1511.01450 | i | the low - energy effective theory describing the dynamics of a collection of wrapped d - branes at small separations is given by quiver quantum mechanics @xcite . these d - branes form bound states and , depending on parameters , can either be well separated or on top of each other . when well separated , the theory is... | we numerically construct the bps and non - bps wavefunctions of an quiver quantum mechanics with two abelian nodes and a single arrow . this model captures the dynamics of a pair of wrapped d - branes interacting via a single light string mode . we also numerically compute the energy gap between the ground state and th... | we numerically construct the bps and non - bps wavefunctions of an quiver quantum mechanics with two abelian nodes and a single arrow . this model captures the dynamics of a pair of wrapped d - branes interacting via a single light string mode . a dimensionless parameter , which is inversely proportional to the the fay... |
0705.4319 | i | hercules x-1 ( discovered by tananbaum et al . 1972 ) is one of the most frequently observed x - ray binary systems . the intermediate mass of the donor star , @xmath5 m@xmath6 , leads to a wealth of behavior seen in both low mass and high mass systems . although we suspect the mass flow is primarily through roche lob... | we observed an entire 1.7 day orbit of the x - ray binary hercules x-1 with the far ultraviolet spectroscopic explorer ( _ fuse _ ) . changes in the ovi line profiles through eclipse ingress and egress indicate a keplerian accretion disk spinning prograde with the orbit . these observations may show the first double -... | we observed an entire 1.7 day orbit of the x - ray binary hercules x-1 with the far ultraviolet spectroscopic explorer ( _ fuse _ ) . changes in the ovi line profiles through eclipse ingress and egress indicate a keplerian accretion disk spinning prograde with the orbit . these observations may show the first double -... |
astro-ph0406272 | i | the galactic x - ray transient h 1743@xmath0322 was classified as a black hole candidate by white & marshall ( 1984 ) based on its x - ray spectral characteristics . the source was discovered during its 19771978 outburst with _ heao-1 _ and _ ariel v _ ( doxsey et al . 1977 , kaluzienski & holt 1977 ) . the next conv... | chandra _ and _ rxte _ on four occasions . the _ chandra_/hetgs spectra reveal narrow , variable ( he - like ) fe xxv and ( h - like ) fe xxvi resonance absorption lines . in the first observation this wind may be a hot precursor to the seyfert - like , outflowing `` warm absorber '' we discuss these findings in the co... | we observed the bright phase of the 2003 outburst of the galactic black hole candidate h 1743 in x - rays simultaneously with _ chandra _ and _ rxte _ on four occasions . the _ chandra_/hetgs spectra reveal narrow , variable ( he - like ) fe xxv and ( h - like ) fe xxvi resonance absorption lines . in the first observ... |
astro-ph0406272 | c | the high equivalent neutral hydrogen column density along the line of sight is consistent with a central galactic distance to h 1743@xmath0322 . for distances greater than @xmath853 kpc , the highest 0.510.0 kev unabsorbed flux observed ( see table 2 ) exceeds the eddington limit for a neutron star . moreover , the p... | , the fe xxvi line has a fwhm of km / s and a blue - shift of km / s , suggesting that the highly ionized medium is an outflow . moreover , the fe xxv line is observed to vary significantly on a timescale of a few hundred seconds in the first observation , which corresponds to the keplerian orbital period at approxima... | we observed the bright phase of the 2003 outburst of the galactic black hole candidate h 1743 in x - rays simultaneously with _ chandra _ and _ rxte _ on four occasions . the _ chandra_/hetgs spectra reveal narrow , variable ( he - like ) fe xxv and ( h - like ) fe xxvi resonance absorption lines . in the first observ... |
1102.3360 | i | in the 18th century , euler considered the problem of optimizing functionals depending not only on some unknown function @xmath0 and some derivative of @xmath0 , but also on an antiderivative of @xmath0 ( see @xcite ) . similar problems have been recently investigated in @xcite , where lagrangians containing higher - o... | isoperimetric problems , problems with holonomic constraints and depending on higher - order caputo derivatives , as well as fractional lagrange problems , are considered . 49k05 , 49s05 , 26a33 , 34a08 . calculus of variations , fractional calculus , caputo derivatives , fractional necessary optimality equations... | we obtain necessary optimality conditions for variational problems with a lagrangian depending on a caputo fractional derivative , a fractional and an indefinite integral . main results give fractional euler lagrange type equations and natural boundary conditions , which provide a generalization of previous results fo... |
1307.6388 | i | we have examined the stability properties of a relativistic magnetized cylindrical flow in the approximation of zero thermal pressure , neglecting also the effects of rotation and focusing only on the @xmath0 mode . in this configuration we have two kinds of instability that may be present : kelvin - helmholtz and curr... | we perform a linear analysis of the stability of a magnetized relativistic non - rotating cylindrical flow in the aproximation of zero thermal pressure , considering only the mode . the current driven mode is splitted in two branches , the branch at high wavenumbers is characterized by the eigenfunction concentrated in... | we perform a linear analysis of the stability of a magnetized relativistic non - rotating cylindrical flow in the aproximation of zero thermal pressure , considering only the mode . we find that there are two modes of instability : kelvin - helmholtz and current driven . the kelvin - helmholtz mode is found at low magn... |
astro-ph0512272 | i | one of the great unsolved problems of planet formation is how to form planetesimals , the kilometer - sized precursors of real planets @xcite . at this size solid bodies in a protoplanetary disk can attract each other through gravitational two - body encounters , whereas gravity is insignificant between smaller bodies ... | a two - dimensional corotating slice in the azimuthal vertical plane of the disk is considered where we include the coriolis force and the radial advection of the keplerian rotation flow . the azimuthally averaged state of the self - sustained kelvin - helmholtz turbulence is found to have a constant richardson number... | we perform numerical simulations of the kelvin - helmholtz instability in the mid - plane of a protoplanetary disk . a two - dimensional corotating slice in the azimuthal vertical plane of the disk is considered where we include the coriolis force and the radial advection of the keplerian rotation flow . dust grains ,... |
0707.2636 | i | we have observed ngc 6946 as part of a program of deep mapping of extended , cold co in nearby spiral galaxies @xcite . large , fully - sampled , and deep images of co in nearby galaxies are relatively uncommon . interferometric images either do not contain zero spacing data ( e.g. , * ? ? ? * ) or if they do , the im... | we present on the fly " maps of the co(1 - 0 ) and co(2 - 1 ) emission covering a 10 10 region of the ngc 6946 . using our co maps and archival vla hi observations we create a total gas surface density map , , for ngc 6946 . the predominantly molecular inner gas disk transitions smoothly into an atomic outer gas ... | we present on the fly " maps of the co(1 - 0 ) and co(2 - 1 ) emission covering a 10 10 region of the ngc 6946 . using our co maps and archival vla hi observations we create a total gas surface density map , , for ngc 6946 . the predominantly molecular inner gas disk transitions smoothly into an atomic outer gas ... |
0707.2636 | c | we have obtained deep co(1 - 0 ) and co(2 - 1 ) images of a 10 @xmath0 10 region centered on the sc galaxy , ngc 6946 , with 55 and 27 resolution using the nrao 12 meter telescope . we have combined these deep co images with vla hi images to obtain images of the neutral gas in this galaxy . to summarize our findi... | we estimate that the total mass is , roughly 1/3 of the interstellar hydrogen gas mass , and about 2% of the dynamical mass of the galaxy at our assumed distance of 6 mpc . the high star formation rate at the nucleus appears to be due to a large accumulation of molecular gas rather than a large increase in the star fo... | we present on the fly " maps of the co(1 - 0 ) and co(2 - 1 ) emission covering a 10 10 region of the ngc 6946 . using our co maps and archival vla hi observations we create a total gas surface density map , , for ngc 6946 . the predominantly molecular inner gas disk transitions smoothly into an atomic outer gas ... |
1511.00218 | i | the understanding of low - energy electronic structures and excitations in real materials is an important subject of condensed - matter physics and material science . interesting phenomena such as a non - fermi - liquid behavior and unconventional superconductivity are caused by the instability of electronic structures... | we present _ ab initio _ these materials exhibit characteristic low - energy band structures around the fermi level , which bring about interesting low - energy properties ; the low - energy bands near the fermi level are isolated from the other bands and , in the isolated bands , unusually low - energy plasmon excitat... | we present _ ab initio _ plus cumulant - expansion calculations for an organic compound ( tmtsf)pf and a transition - metal oxide srvo . these materials exhibit characteristic low - energy band structures around the fermi level , which bring about interesting low - energy properties ; the low - energy bands near the f... |
1511.00218 | c | we have performed _ ab initio _ @xmath0 plus cumulant - expansion calculations for an organic conductor ( tmtsf)@xmath1pf@xmath2 and a transition - metal oxide srvo@xmath3 to study the low - energy plasmon - fluctuation effect on the electronic structure . the bands around the fermi level of these materials are isolate... | plus cumulant - expansion calculations for an organic compound ( tmtsf)pf and a transition - metal oxide srvo . we found that the low - energy plasmon fluctuation leads to an appreciable renormalization of the low - energy bands and a transfer of the spectral weight into the incoherent part , thus resulting in an agre... | we present _ ab initio _ plus cumulant - expansion calculations for an organic compound ( tmtsf)pf and a transition - metal oxide srvo . these materials exhibit characteristic low - energy band structures around the fermi level , which bring about interesting low - energy properties ; the low - energy bands near the f... |
astro-ph0703769 | i | we present a catalog of variable stars within @xmath6 pc of sgr a * in the near - infrared @xmath1 and @xmath2 bands over a three - year baseline ; @xmath153% of these variables are previously unidentfied . this is the first photometric variability study of the galactic center to use the technique of image subtractio... | we present a catalog of 110 variable stars within of sgr a * based on image subtraction of near - infrared ( and ) photometry . we associate irs 10 * with oh , sio , and ho masers and a bright x - ray point source ; this analysis suggests irs 10 * is an agb star with an accreting companion . among the newly discover... | we present a catalog of 110 variable stars within of sgr a * based on image subtraction of near - infrared ( and ) photometry . our images were obtained over 133 nights from 2000 to 2002 in-band and over 134 nights from 2001 to 2002 in-band ; the typical fwhm is . we match the catalog to other near - infrared , x - ra... |
astro-ph9808206 | i | with the recent development of large format infrared array detectors , high quality photometric surveys are routinely conducted at wavelengths between 12.5 @xmath3 m . soon the completion of the 2 micron all sky survey ( 2mass ; skrutskie 1997 ) and denis ( epchtein et al . 1997 ) will provide comprehensive catalogue... | we present a catalogue of h band spectra for 85 stars of approximately solar abundance observed at a resolving power of 3000 with the kpno mayall 4 m fts . the atlas covers spectral types o7m5 and luminosity classes i - v as defined on the mk system . the line ratios permit spectral classification in the presence of c... | we present a catalogue of h band spectra for 85 stars of approximately solar abundance observed at a resolving power of 3000 with the kpno mayall 4 m fts . the atlas covers spectral types o7m5 and luminosity classes i - v as defined on the mk system . we identify both atomic and molecular indices and line ratios whic... |
1601.00243 | i | fluid flows in two spatial dimensions have been the subject of substantial research efforts in recent decades . for the greater part of the twentieth century , it was generally considered that two - dimensional ( 2d ) flows were merely a theoretical idealization with limited practical relevance . this conception has ch... | we also introduce a realistic numerical model approximating the electromagnetic body force in the experiment , which is validated against experimental measurements . we then explore the effect of lateral boundaries by performing direct numerical simulations ( dns ) subject to different types of boundary conditions . we... | we present a combined experimental and numerical study of the primary and secondary instabilities in a kolmogorov - like flow . the experiment uses electromagnetic forcing with an approximately sinusoidal spatial profile to drive a quasi - two - dimensional ( q2d ) shear flow in a thin layer of electrolyte suspended on... |
1601.00243 | c | in this article , we have presented a combined experimental and numerical study of bifurcations in a q2d kolmogorov - like flow . this flow is realized in the laboratory by electromagnetically driving a stratified layer of electrolyte above an immiscible layer of dielectric . this q2d flow is described using a 2d model... | we present a combined experimental and numerical study of the primary and secondary instabilities in a kolmogorov - like flow . the experiment uses electromagnetic forcing with an approximately sinusoidal spatial profile to drive a quasi - two - dimensional ( q2d ) shear flow in a thin layer of electrolyte suspended on... | we present a combined experimental and numerical study of the primary and secondary instabilities in a kolmogorov - like flow . the experiment uses electromagnetic forcing with an approximately sinusoidal spatial profile to drive a quasi - two - dimensional ( q2d ) shear flow in a thin layer of electrolyte suspended on... |
1104.0656 | i | the rapid development of quantum information science has brought together several areas of theoretical and experimental physics @xcite . much effort has been concentrated in the search for solutions to sensitive problems that prevent the efficient realization of quantum information processing @xcite . we first mention ... | we present a derivation of the redfield formalism for treating the dissipative dynamics of a time - dependent quantum system coupled to a classical environment . we compare such a formalism with the master equation approach where the environments are treated quantum mechanically . focusing on a time - dependent spin- s... | we present a derivation of the redfield formalism for treating the dissipative dynamics of a time - dependent quantum system coupled to a classical environment . we compare such a formalism with the master equation approach where the environments are treated quantum mechanically . focusing on a time - dependent spin- s... |
cond-mat9411034 | c | in this paper we presented a detailed , quantitative study of the physical effects caused by the simultaneous presence of interactions and randomness in a system of lattice electrons . to this end we investigated the anderson - hubbard model with diagonal disorder at half filling in the limit of infinite spatial dimens... | we present a detailed , quantitative study of the competition between interaction- and disorder - induced effects in electronic systems . for this the anderson - hubbard model with diagonal disorder is investigated analytically and numerically in the limit of infinite spatial dimensions , i.e. within a dynamical mean ... | we present a detailed , quantitative study of the competition between interaction- and disorder - induced effects in electronic systems . for this the anderson - hubbard model with diagonal disorder is investigated analytically and numerically in the limit of infinite spatial dimensions , i.e. within a dynamical mean ... |
astro-ph0506121 | r | as the dynamical evolution calculations begins , the disks experience an initial transient , which is essentially numerical in origin , and is due to the fact that the configuration is not in strict hydrostatic equilibrium ( recall that it is obtained from azimuthally averaging the results of 3d calculations ) . this t... | this transition produces an inversion of the lepton gradient in the innermost regions of the flow which drives convective motions , and affects the density and disk scale height radial profiles . the electron fraction remains low in the region close to the black hole , and if preserved in an outflow , could give rise t... | we present a detailed , two dimensional numerical study of the microphysical conditions and dynamical evolution of accretion disks around black holes when neutrino emission is the main source of cooling . such structures are likely to form after the gravitational collapse of massive rotating stellar cores , or the coal... |
astro-ph0506121 | i | we have performed two - dimensional hydrodynamical simulations of accretion disks in the regime of hypercritical accretion , where neutrino emission is the main cooling agent . the disks are assumed to be present around a stellar mass black hole , and are evolved for a few hundred dynamical timescales . we have paid p... | we present a detailed , two dimensional numerical study of the microphysical conditions and dynamical evolution of accretion disks around black holes when neutrino emission is the main source of cooling . the physical composition is determined self consistently by considering two regimes : neutrino opaque and neutrino... | we present a detailed , two dimensional numerical study of the microphysical conditions and dynamical evolution of accretion disks around black holes when neutrino emission is the main source of cooling . such structures are likely to form after the gravitational collapse of massive rotating stellar cores , or the coal... |
1011.0798 | c | our photometric and spectroscopic analyses of the components of 2mass j0850 + 1057 and 2mass j1728 + 3948 have revealed several unusual traits , particularly in their primaries : under- and overluminous fluxes and unusually early and late near - infrared spectral types . these peculiar traits can be related to their ... | we deduce that thick condensate clouds are likely responsible for the unusual properties of 2mass j1728 + 3948a , while 2mass j0850 + 1057a is either an inflated young brown dwarf or a tight unresolved binary , making it potentially part of a wide , low - mass , hierarchical quintuple system . | we present a detailed examination of the brown dwarf multiples 2mass j08503593 + 1057156 and 2mass j17281150 + 3948593 , both suspected of harboring components that straddle the l dwarf / t dwarf transition . resolved photometry from _ hubble space telescope_/nicmos show opposite trends in the relative colors of the ... |
1011.0798 | i | we have presented photometric and spectroscopic analyses of the late - type l dwarf binaries 2mass j0850 + 1057 and 2mass j1728 + 3948 , aimed at assessing component spectral types , absolute magnitudes and near - infrared colors . multi - band hst / nicmos photometry have revealed distinct trends in the relative col... | hubble space telescope_/nicmos show opposite trends in the relative colors of the components , with the secondary of 2mass j0850 + 1057 being redder than its primary , while that of 2mass j1728 + 3948 is bluer . combinations of l7 + l6 for 2mass j0850 + 1057 and l5 + l6.5 for 2mass j1728 + 3948 are inferred . | we present a detailed examination of the brown dwarf multiples 2mass j08503593 + 1057156 and 2mass j17281150 + 3948593 , both suspected of harboring components that straddle the l dwarf / t dwarf transition . resolved photometry from _ hubble space telescope_/nicmos show opposite trends in the relative colors of the ... |
1104.3090 | c | we have introduced a framework of removable pairings to find eulerian multigraphs . this framework proved to be useful to obtain an approximation algorithm for graph - tspwith an approximation ratio smaller than @xmath0 and to obtain a tight upper bound on the integrality gap of the held - karp relaxation for a restric... | the approach yields a-approximation algorithm with respect to the held - karp lower bound . for graph - tsprestricted to a class of graphs that contains degree three bounded and claw - free graphs , we show that the integrality gap of the held - karp relaxation matches the conjectured ratio . | we present a framework for approximating the metric tsp based on a novel use of matchings . traditionally , matchings have been used to add edges in order to make a given graph eulerian , whereas our approach also allows for the removal of certain edges leading to a decreased cost . for the tsp on graphic metrics ( ... |
0907.2016 | i | in this study , we consider nonlinear evolution equations of the form @xmath9 , \qquad { \bf x}\in\mathbb{r}^d , \quad d>1.\ ] ] examples for such equations are the nonlinear schrdinger equation , the biharmonic nonlinear schrdinger equation , the nonlinear heat equation , and the biharmonic nonlinear heat equation . i... | we present a general framework for constructing singular solutions of nonlinear evolution equations that become singular on a -dimensional sphere , where . we provide a detailed numerical investigation of these new singular solutions for the following equations : the nonlinear schrdinger equation with , the biharmoni... | we present a general framework for constructing singular solutions of nonlinear evolution equations that become singular on a -dimensional sphere , where . the asymptotic profile and blowup rate of these solutions are the same as those of solutions of the corresponding one - dimensional equation that become singular at... |
1511.05145 | c | using 38 sne ii in the hubble flow we develop a technique based solely on photometric data ( pcm ) to build a hubble diagram based on sne ii . in summary : 1 . using pcm we find a dispersion of 0.44 mag using the @xmath2 band and 0.43 mag with the @xmath25 band , thus using nir filters the improvement is not so ... | we obtain a dispersion of 0.44 mag using a combination of the colour and the band and we are able to reduce the dispersion to 0.39 mag using our golden sample . a comparison of our photometric colour method ( pcm ) with the standardised candle method ( scm ) is also performed . the dispersion obtained for the scm ( whi... | we present a hubble diagram of type ii supernovae using corrected magnitudes derived only from photometry , with no input of spectral information . we use a data set from the carnegie supernovae project i ( csp ) for which optical and near - infrared light - curves were obtained . the apparent magnitude is corrected by... |
astro-ph0508457 | i | the magellanic clouds ( mcs ) are the closest , easily observable galaxies from our vantage point in the milky way . they are of fundamental importance for studies of stellar populations , the interstellar medium , and the cosmological distance scale . moreover , due to their locations at 50 kpc ( lmc ) and 61 kpc ( sm... | we present a measurement of the systemic proper motion of the large magellanic cloud ( lmc ) from astrometry with the high resolution camera ( hrc ) of the advanced camera for surveys ( acs ) on the hubble space telescope ( ) . the qsos are distributed homogeneously behind the central few degrees of the lmc . with 2 ep... | we present a measurement of the systemic proper motion of the large magellanic cloud ( lmc ) from astrometry with the high resolution camera ( hrc ) of the advanced camera for surveys ( acs ) on the hubble space telescope ( ) . we observed lmc fields centered on 21 background qsos that were discovered from their optica... |
astro-ph0508457 | i | we undertook a project using two epochs of @xmath0/acs data of magellanic cloud fields centered on background qsos to determine the systemic proper motion of the clouds . the lmc results are presented in this paper . we have determined the proper motion of the lmc to be @xmath158 . this is accurate to better than 5% . ... | we determine the proper motion of the lmc to better than% accuracy : . this is the most accurate proper motion measurement for any milky way satellite thus far . when combined with hi data from the magellanic stream this should provide new constraints on both the mass distribution of the galactic halo and models of the... | we present a measurement of the systemic proper motion of the large magellanic cloud ( lmc ) from astrometry with the high resolution camera ( hrc ) of the advanced camera for surveys ( acs ) on the hubble space telescope ( ) . we observed lmc fields centered on 21 background qsos that were discovered from their optica... |
1106.5739 | i | feynman integrals in perturbative quantum field theory are generically expressed in terms of the classical polylogarithm functions @xmath3 and the nielsen polylogarithms @xmath4 @xcite . in the late nineties , it was realized that these classes of functions are too restricted when going beyond one - loop level in the ... | pacs : 12.38.bx , perturbative calculations harmonic polylogarithms , fortran , loop computations . ippp/11/36 , dcpt/11/72 , , * program summary * _ manuscript title : _ chaplin - complex harmonic polylogarithms in fortran + _ authors : _ stephan buehler , claude duhr + _ program title : _ chaplin + ... | we present a new fortran library to evaluate all harmonic polylogarithms up to weight four numerically for any complex argument . the algorithm is based on a reduction of harmonic polylogarithms up to weight four to a minimal set of basis functions that are computed numerically using series expansions allowing for fast... |
1106.5739 | i | in this paper we have presented chaplin , a new fortran library to compute harmonic polylogarithms up to weight four for arbitrary complex argument . the algorithm is based on a reduction of hpl s to a set of basis functions which are then evaluated numerically using series expansions allowing for a very fast numerical... | we present a new fortran library to evaluate all harmonic polylogarithms up to weight four numerically for any complex argument . the algorithm is based on a reduction of harmonic polylogarithms up to weight four to a minimal set of basis functions that are computed numerically using series expansions allowing for fast... | we present a new fortran library to evaluate all harmonic polylogarithms up to weight four numerically for any complex argument . the algorithm is based on a reduction of harmonic polylogarithms up to weight four to a minimal set of basis functions that are computed numerically using series expansions allowing for fast... |
0802.0377 | i | in recent years , the dynamics of heavy ion collisions at intermediate energy has been extensively investigated within the framework of transport theories , such as the nordheim approach , in which the vlasov equation for the one - body phase space density , @xmath1 , is supplemented with a pauli - blocked boltzmann co... | we present a new method to introduce phase - space fluctuations in transport theories , corresponding to a full implementation of the boltzmann - langevin equation for fermionic systems . it is based on the procedure originally developed by bauer et al . for transport codes employing the test particle method . in the n... | we present a new method to introduce phase - space fluctuations in transport theories , corresponding to a full implementation of the boltzmann - langevin equation for fermionic systems . it is based on the procedure originally developed by bauer et al . for transport codes employing the test particle method . in the n... |
1312.2025 | i | atmospheric pressure is a fundamental parameter for characterizing the environment and habitability of an extrasolar planet . water s stability on a planetary surface as a liquid depends on both the surface temperature and pressure . while the freezing point of water is not strongly dependent on pressure , pressure doe... | we present a new method to probe atmospheric pressure on earthlike planets using ( o-o ) dimers in the near - infrared . the absorption by dimers changes more rapidly with pressure and density than that of monomers , and can therefore provide additional information about atmospheric pressures . by comparing the absorpt... | we present a new method to probe atmospheric pressure on earthlike planets using ( o-o ) dimers in the near - infrared . we also show that dimer features could be the most readily detectable biosignatures for earthlike atmospheres , and may even be detectable in transit transmission with the james webb space telescope ... |
1312.2025 | m | in this paper we generated transit transmission and direct imaging reflected spectra for cloud and aerosol - free earthlike exoplanets . the models we have used to do this are described below . when an extrasolar planet transits or occults its host star , the planetary atmosphere is backlit and some of the star s light... | it works best for planets around m dwarfs with atmospheric pressures between 0.1 and 10 bars , and for o volume mixing ratios above 50% of earth s present day level . furthermore , unlike observations of rayleigh scattering , this method can be used at wavelengths longer than 0.6 m , and is therefore potentially applic... | we present a new method to probe atmospheric pressure on earthlike planets using ( o-o ) dimers in the near - infrared . we also show that dimer features could be the most readily detectable biosignatures for earthlike atmospheres , and may even be detectable in transit transmission with the james webb space telescope ... |
1312.2025 | r | we have generated transit transmission spectra and direct imaging spectra for atmospheres with o@xmath0 concentrations of 10% , 50% , 100% and 200% of the pal and pressures of 0.1 , 0.5 , 1 , 3 , 5 and 10 bars . figure [ fig : plottran ] shows the resulting transit transmission spectra for 100% pal o@xmath0 . transmiss... | we have also performed detectability studies for jwst transit transmission spectroscopy and find that the 1.06 m and 1.27 m dimer features could be detectable ( snr ) for an earth - analog orbiting an m5v star at a distance of 5 pc . we have calculated the required signal - to - noise ratios to detect and characterize ... | we present a new method to probe atmospheric pressure on earthlike planets using ( o-o ) dimers in the near - infrared . we also show that dimer features could be the most readily detectable biosignatures for earthlike atmospheres , and may even be detectable in transit transmission with the james webb space telescope ... |
1312.2025 | c | the 1.06 @xmath1 m dimer feature is prominent in transit transmission for atmospheres with @xmath3750% pal o@xmath0 and surface pressures @xmath370.5 bars . it is a prominent feature in the reflected spectra for atmospheres with @xmath3750% pal o@xmath0 and surface pressure @xmath373 bars . for the reflected spectra , ... | we also show that dimer features could be the most readily detectable biosignatures for earthlike atmospheres , and may even be detectable in transit transmission with the james webb space telescope ( jwst ) . we show that in some cases it may be possible to estimate the pressure at the reflecting surface of a planet .... | we present a new method to probe atmospheric pressure on earthlike planets using ( o-o ) dimers in the near - infrared . we also show that dimer features could be the most readily detectable biosignatures for earthlike atmospheres , and may even be detectable in transit transmission with the james webb space telescope ... |
astro-ph0003128 | c | we have developed a simple model to compute the effects of dust on the integrated spectral properties of galaxies , based on an idealized prescription of the main features of the ism . our model includes the ionization of hii regions in the interiors of the dense clouds in which stars form . emission lines from hii reg... | we present a new model to compute the effects of dust on the integrated spectral properties of galaxies , based on an idealized prescription of the main features of the interstellar medium ( ism ) . the model includes the ionization of hii regions in the interiors of the dense clouds in which stars form and the influen... | we present a new model to compute the effects of dust on the integrated spectral properties of galaxies , based on an idealized prescription of the main features of the interstellar medium ( ism ) . the model includes the ionization of hii regions in the interiors of the dense clouds in which stars form and the influen... |
gr-qc0301006 | i | in this paper we introduce a numerical code designed to solve the einstein field equations for axisymmetric spacetimes . even though the predominant focus in numerical relativity in recent years has been to study situations of relevance to gravitational wave detection , and hence lacking symmetries , there are still nu... | we present a new numerical code designed to solve the einstein field equations for axisymmetric spacetimes . the long term goal of this project is to construct a code that will be capable of studying many problems of interest in axisymmetry , including gravitational collapse , critical phenomena , investigations of cos... | we present a new numerical code designed to solve the einstein field equations for axisymmetric spacetimes . the long term goal of this project is to construct a code that will be capable of studying many problems of interest in axisymmetry , including gravitational collapse , critical phenomena , investigations of cos... |
cond-mat9810403 | c | we have presented a dynamic density functional approach for the relaxation of a classical system in terms of its equilibrium free energy density functional @xmath0 $ ] . the approach is valid only when the velocity correlations ( not included in @xmath0 $ ] ) are irrelevant , which excludes hydrodynamic modes and tempe... | we present a new time - dependent density functional approach to study the relaxational dynamics of an assembly of interacting particles subject to thermal noise . starting from the langevin stochastic equations of motion for the velocities of the particles we are able by means of an approximated closure to derive a se... | we present a new time - dependent density functional approach to study the relaxational dynamics of an assembly of interacting particles subject to thermal noise . starting from the langevin stochastic equations of motion for the velocities of the particles we are able by means of an approximated closure to derive a se... |
1309.0061 | c | in this paper , we have presented the scattering - state description of the inelastic shot noise in a regime of a weak el - vib coupling and equilibrated vibrons . as discussed in the inelastic current , the inelastic shot noise is determined by the interplay of elastic and inelastic scattering processes . the elastic ... | we present a scattering theory description for the inelastic current noise in the presence of electron - vibration interactions . in this description , we specify elastic and inelastic scattering contributions to the shot noise by examining charge transfers between scattering states and energy exchange between electron... | we present a scattering theory description for the inelastic current noise in the presence of electron - vibration interactions . in this description , we specify elastic and inelastic scattering contributions to the shot noise by examining charge transfers between scattering states and energy exchange between electron... |
cond-mat0601004 | i | the matter wave beam splitters are nowadays the cornerstone of a wide range of experiments , from atomic clocks and gravito - inertial sensors to laser cooling and ultracold atoms characterization , quantum computing and cavity qed experiments , atom lithography and chemical reaction dynamics , detection of tiny effect... | the dispersive structuring of an incident atomic wave packet - due to such generalized beam splitters - is studied and modeled , and several important dynamical features of the solutions are detailed ( generalized rabi oscillations , velocity selection , anomalous dispersion , generalized borrmann effect and anomalous ... | we present a strong field theory of matter wave splitting in the presence of various gravitational , inertial and trapping potentials . the effect of these potentials on the resonance condition ( between the splitting potential and the considered effective two - level system ) and on the atomic borrmann effect is inves... |
cond-mat0601004 | c | in conclusion , we have shown in this paper how to solve the problem of matter wave splitting in the presence of various gravitational , inertial and trapping potentials . in particular , we have seen how the resonance condition between the splitting potential and the effective two - level atoms has to be changed . the... | we present a strong field theory of matter wave splitting in the presence of various gravitational , inertial and trapping potentials . the effect of these potentials on the resonance condition ( between the splitting potential and the considered effective two - level system ) and on the atomic borrmann effect is inves... | we present a strong field theory of matter wave splitting in the presence of various gravitational , inertial and trapping potentials . the effect of these potentials on the resonance condition ( between the splitting potential and the considered effective two - level system ) and on the atomic borrmann effect is inves... |
0902.0004 | i | recent studies of galaxy evolution have invoked a significant component of energetic feedback from an active galactic nucleus ( agn ) to attempt to explain many of the observed properties of galaxies . specifically , agn feedback has been implicated as the primary cause behind the differences between observed and theor... | we present a study of outflow and feedback in the well - known seyfert 2 galaxy markarian 573 using high angular resolution long - slit spectrophotometry obtained with the _ hubble space telescope _ imaging spectrograph ( stis ) . these results are at odds with the picture of strong agn feedback that has been invoked ... | we present a study of outflow and feedback in the well - known seyfert 2 galaxy markarian 573 using high angular resolution long - slit spectrophotometry obtained with the _ hubble space telescope _ imaging spectrograph ( stis ) . through analysis of the kinematics and ionization state of a biconical outflow region em... |
1207.0767 | i | the phase space of the galaxy s disk , as observed near the sun , contains substructure within the larger structures known as the thin and the thick disk . substructures include open clusters and stellar streams , also often referred to as moving groups . moving groups , as promoted by eggen ( see e.g. , @xcite and ref... | results show both streams are metal - poor and very old ( 10 gyrs ) with kinematics and abundances overlapping with the properties of local field thick disk stars . both streams exhibit a range in metallicity but with relative elemental abundances that are identical to those of thick disk stars of the same metallicity ... | we present abundances for 20 elements for stars in two stellar streams identified by : 18 stars from the arcturus stream and 26 from a new stream , which we call af06 stream , both from the galactic thick disk . results show both streams are metal - poor and very old ( 10 gyrs ) with kinematics and abundances overlappi... |
1207.0767 | r | since their discovery ( cf . @xcite ) , various theories have been put forward to explain the substructures in phase space known variously as moving groups or stellar streams . the most prominent theories identify a stellar stream as either a ) a dissolved open cluster , b ) debris from an accreted satellite galaxy , o... | we present abundances for 20 elements for stars in two stellar streams identified by : 18 stars from the arcturus stream and 26 from a new stream , which we call af06 stream , both from the galactic thick disk . it is highly unlikely that either stream represents tidal debris from an accreted satellite galaxy . both st... | we present abundances for 20 elements for stars in two stellar streams identified by : 18 stars from the arcturus stream and 26 from a new stream , which we call af06 stream , both from the galactic thick disk . results show both streams are metal - poor and very old ( 10 gyrs ) with kinematics and abundances overlappi... |
1307.1830 | r | first we present the statistical result concerning the distribution of leading and trailing modes of galaxies in the total sample and subsamples . then , we study the distribution of the leading and trailing arm galaxies in the unit area of the sky and the groups . the equatorial pa - distribution of galaxies in the to... | is studied using chi - square , auto - correlation and the fourier tests . we noticed a good agreement between the random alignment of the position angle ( pa ) distribution and the existence of chirality in both the leading and trailing arm galaxies . chirality is found stronger for the late - type spirals ( sc , scd ... | we present an analysis of the chiral property of 1621 field galaxies having radial velocity 3000 km s to 5000 km s . a correlation between the chiral symmetry breaking and the preferred alignment of galaxies in the leading and trailing structural modes is studied using chi - square , auto - correlation and the fourier ... |
0803.4032 | r | emission lines can be used to separate star - burst and active galactic nuclei ( agn ) galaxies using the [ oiii]@xmath305007/h@xmath29[nii]/h@xmath28 diagnostic . values of the [ oiii]@xmath305007 , [ nii ] and h@xmath28 emission strengths were estimated from the 6dfgs spectra in a traditional manner ( section [ meas_... | we also derive dynamical masses and dynamical mass - to - light ratios for these galaxies by combining the central velocity dispersions with global photometry in the b , r and k bands from supercosmos and 2mass . together , these data allow us to reduce the degeneracies between age , metallicity and star formation burs... | we present an analysis of the stellar populations as a function of mass in a sample of galaxies of all morphological and emission types from the 6df galaxy survey ( 6dfgs ) . we measure velocity dispersions and lick indices from the spectra of the central regions of these galaxies , deriving ages and metallicities from... |
0803.4032 | c | we have measured ages and metallicities from the 6dfgs spectra of @xmath07000 galaxies of all morphological and emission types . we have demonstrated that the age metallicity degeneracy has been broken in this study , particularly with regard to the very young and very old galaxies used in the subsequent analysis . th... | we find that old galaxies exhibit a mass - metallicity relation with logarithmic slope d[fe / h]/dlog , while young galaxies show slopes consistent with zero . when we account for the effects of the mass - metallicity relation , we obtain a single , consistent relation between mass - to - light ratio and mass for old g... | we present an analysis of the stellar populations as a function of mass in a sample of galaxies of all morphological and emission types from the 6df galaxy survey ( 6dfgs ) . we measure velocity dispersions and lick indices from the spectra of the central regions of these galaxies , deriving ages and metallicities from... |
astro-ph0509148 | i | one of the key predictions of any cosmological structure formation model is the distribution of matter on large scales . we now know that the cold dark matter ( cdm ) paradigm can account for many of the observed characteristics of the galaxy distribution . in this picture , the universe contained tiny ( gaussian ) den... | we find that , because of bias , galaxy voids are typically significantly larger than dark matter voids and should fill most of the universe . we show that voids selected from catalogs of luminous galaxies should be larger than those selected from faint galaxies : the characteristic radii range from for galaxies with a... | we present an analytic model for the sizes of voids in the galaxy distribution . peebles and others have recently emphasized the possibility that the observed characteristics of voids may point to a problem in galaxy formation models , but testing these claims has been difficult without any clear predictions for their ... |
astro-ph0509148 | c | we have described a simple analytic model for voids in the galaxy distribution . our model is based on @xcite , who showed how to apply the excursion set formalism to underdensities . its most important parameter is @xmath62 , the linearized underdensity of a void . those authors originally set @xmath62 to be the densi... | we present an analytic model for the sizes of voids in the galaxy distribution . peebles and others have recently emphasized the possibility that the observed characteristics of voids may point to a problem in galaxy formation models , but testing these claims has been difficult without any clear predictions for their ... | we present an analytic model for the sizes of voids in the galaxy distribution . peebles and others have recently emphasized the possibility that the observed characteristics of voids may point to a problem in galaxy formation models , but testing these claims has been difficult without any clear predictions for their ... |
astro-ph0009158 | i | this paper presents the photometric redshift catalogs that have been used in previous papers to investigate different aspects of the evolution of galaxies in the high redshift universe , such as the history of the uv luminosity density and the number of massive galaxies already assembled at early epochs ( fontana et al... | we present and compare in this paper new photometric redshift catalogs of the galaxies in three public fields : the ntt deep field , the hdf n and the hdf s . in the case of the ntt deep field , we present here a new photometric catalog , obtained by combining the existing bvri and jk with new deep u observations acq... | we present and compare in this paper new photometric redshift catalogs of the galaxies in three public fields : the ntt deep field , the hdf n and the hdf s . in the case of the ntt deep field , we present here a new photometric catalog , obtained by combining the existing bvri and jk with new deep u observations acq... |
astro-ph0201185 | i | there is now a large and compelling body of observational evidence that suggests that most , if not all , galaxies contain supermassive black holes at their centers ( e.g. , * ? ? ? however , active galactic nuclei ( agn ) are only found in a small minority of all galaxies in the local universe ( e.g. , * ? ? ? * ; * ?... | we present archival _ hubble space telescope _ images of the nuclear regions of 43 of the 46 seyfert galaxies found in the volume - limited , spectroscopically complete cfa redshift survey sample . using an improved method of image contrast enhancement , we see no significant differences in the circumnuclear dust morph... | we present archival _ hubble space telescope _ images of the nuclear regions of 43 of the 46 seyfert galaxies found in the volume - limited , spectroscopically complete cfa redshift survey sample . using an improved method of image contrast enhancement , we create detailed high - quality `` structure maps '' that allow... |
0912.1760 | i | our _ ab initio _ studies of the electronic structure , magnetic moments , exchange interactions and curie temperatures in zb crx ( x = as , sb , s , se and te ) and cras@xmath0x@xmath0 ( x = sb , s , se and te ) reveal that half - metallicity in these alloys is maintained over a wide range of lattice parameters . the ... | we present calculations of the exchange interactions and curie temperatures in cr - based pnictides and chalcogenides of the form crx with x = as , sb , s , se and te , and the mixed alloys crasx with x = sb , s , se , and te . the disorder effect in the as - sublattice for crasx ( x = sb , s , se , te ) alloys is take... | we present calculations of the exchange interactions and curie temperatures in cr - based pnictides and chalcogenides of the form crx with x = as , sb , s , se and te , and the mixed alloys crasx with x = sb , s , se , and te . the calculations are performed for zinc blende ( zb ) structure for 12 values of the lattice... |
0705.2736 | c | we present sensitive observations of a complete sample of compact polarized radio sources , as part of a deep integration of the elais n1 region made with the synthesis telescope at the dominion radio astrophysical observatory . a total of 83 polarized sources was detected in the ten - field mosaic . the distribution o... | survey north 1 region ( elais n1 ) as part of the dominion radio astrophysical observatory _ planck _ a few host galaxies have colors that suggests significant pah emission in the near - infrared . a small fraction , 12% , of the polarized sources are not detected in the swire data . | we present deep polarimetric observations at 1420 mhz of the european large area _ iso _ survey north 1 region ( elais n1 ) as part of the dominion radio astrophysical observatory _ planck _ deep fields project . by combining closely spaced apertures synthesis fields , we image a region of 7.43 square degrees to a maxi... |
astro-ph9912004 | c | we have presented detailed models for the formation of disk galaxies in both a cdm and a mond universe . in the case of dm , the structure of the disk is governed by the mass and angular momentum of the proto - galaxy . for mond , however , the distribution of angular momenta of proto - galaxies is not known , and we h... | the dm and mond models are almost indistinguishable . they both yield gas mass fractions and dynamical mass - to - light ratios which are in good agreement with observations . both models reproduce the narrow relation between global mass - to - light ratio and central surface brightness , and reveal a characteristic ac... | we present detailed semi - analytical models for the formation of disk galaxies both in a universe dominated by dark matter ( dm ) , and in one for which the force law is given by modified newtonian dynamics ( mond ) . we tune the models to fit the observed near - infrared tully - fisher ( tf ) relation , and compare n... |
astro-ph0004044 | r | table [ modelle ] contains the best fit model for each image . together with the galaxy name , the filter , and the referring image , with integration time , and run i d , we list the inclination , the best fitting function for the z - distribution , the calibration index ( ref . section [ calib ] ) , and the central s... | these differences are not due to the individual method itself , but rather to the selected fitting region , which masks the bulge component , the dust lane , or present foreground stars . other serious limitations are small but appreciable intrinsic deviations of real disks compared to the simple input model . | we present detailed three - dimensional modelling of the stellar luminosity distribution for the disks of 31 relatively nearby ( 110 mpc ) edge - on spiral galaxies . in contrast to most of the standard methods available in the literature we take into account the full three - dimensional information of the disk . we mi... |
1110.4226 | i | the observed global properties of galaxies obey a diverse set of scaling relations , which are fundamental tools to constrain models of galaxy formation and evolution . particularly interesting are the correlations between dynamics and luminosity / stellar mass or size , such as the tully - fisher ( tf ; * ? ? ? * ) re... | we present dynamical scaling relations for a homogeneous and representative sample of massive galaxies , selected only by stellar mass ( m ) and redshift ( ) as part of the ongoing galex arecibo sdss survey . [ firstpage ] galaxies : kinematics and dynamics galaxies : evolution galaxies : fundamental parameters r... | we present dynamical scaling relations for a homogeneous and representative sample of massive galaxies , selected only by stellar mass ( m ) and redshift ( ) as part of the ongoing galex arecibo sdss survey . we compare baryonic tully - fisher ( btf ) and faber - jackson ( bfj ) relations for this sample , and investig... |
1110.4226 | c | the main result of this work is the existence of a tight relation between baryonic mass and velocity that is independent of galaxy morphology . to first order , we can remove the dependence of dynamical scaling relations on the internal structure of the galaxy by applying a simple correction to the measured stellar vel... | disk - dominated , gas - rich galaxies systematically deviate from the bfj relation defined by the spheroids . we demonstrate that by applying a simple correction to the stellar velocity dispersions that depends only on the concentration index of the galaxy , we are able to bring disks and spheroids onto the same dynam... | we present dynamical scaling relations for a homogeneous and representative sample of massive galaxies , selected only by stellar mass ( m ) and redshift ( ) as part of the ongoing galex arecibo sdss survey . we compare baryonic tully - fisher ( btf ) and faber - jackson ( bfj ) relations for this sample , and investig... |
1302.6894 | i | in this paper we discuss efficient ways to model optically pumped atoms in a regime where velocity - selective optical pumping ( vsop ) is possible , but where collisional rates with buffer gases are too high to permit the use of models for cooling and trapping in the near absence of collisions . this is the regime of ... | we present efficient theoretical tools for describing the optical pumping of atoms by light propagating at arbitrary directions with respect to an external magnetic field , at buffer - gas pressures that are small enough for velocity - selective optical pumping ( vsop ) but large enough to cause substantial collisional... | we present efficient theoretical tools for describing the optical pumping of atoms by light propagating at arbitrary directions with respect to an external magnetic field , at buffer - gas pressures that are small enough for velocity - selective optical pumping ( vsop ) but large enough to cause substantial collisional... |
1112.0063 | c | we present the empirical formulae of intrinsic reddening as a function of intrinsic h@xmath0 luminosity or surface brightness , metallicity and disc inclination ( equation [ eq : powfit ] , [ eq : powfit_br ] and table [ tab : lha ] and [ tab : br ] ) for a large sample of @xmath122 000 well - defined star - forming... | we present empirical relations between the global dust reddening and other physical galaxy properties including the h luminosity , h surface brightness , metallicity and axial ratio for star - forming disc galaxies . the study is based on a large sample of 22 000 well - defined star - forming galaxies selected from t... | we present empirical relations between the global dust reddening and other physical galaxy properties including the h luminosity , h surface brightness , metallicity and axial ratio for star - forming disc galaxies . the study is based on a large sample of 22 000 well - defined star - forming galaxies selected from t... |
1101.4966 | c | we searched for nebular emission in a sample of 77 bcgs from the 160sd x - ray cluster survey . no or emission stronger than @xmath1 and @xmath2 , respectively , was detected in any bcg . a comparison between our sample and the bcs clusters of similar x - ray luminosity suggests that we should have detected roughly ... | we find no or emission stronger than or , respectively , in any bcg . a comparison to the detection frequency of nebular emission in bcgs at drawn from the brightest cluster survey indicates that we should have detected roughly one dozen emission - line galaxies , assuming the two surveys are selecting similar clusters... | we present equivalent widths of the and nebular emission lines for 77 brightest cluster galaxies ( bcgs ) selected from the 160 square degree x - ray survey . we find no or emission stronger than or , respectively , in any bcg . the corresponding emission line luminosities lie below , which is a factor of 30 below tha... |
astro-ph0210398 | c | the fuv spectrum of ux uma is everywhere characterized by line features . the fuse and archival hst spectra show that from 910 1600 , the time - averaged spectrum is composed of prominent emission lines and a complex blend of weaker features . the emission lines arise from the usual transitions seen in cv spectra i... | we discuss the implications of our results in the context of models of an accretion disk with a chromosphere between the disk and the extended wind . finally , we note that the observed fuv flux is too low to be consistent with the temperature and radius of the wd derived by baptista et al . ( 1995 ) , suggesting that ... | we present far - ultraviolet ( 905 1182 ) , time - series spectroscopy of the eclipsing , novalike cataclysmic variable , ux uma , acquired with fuse . the time - averaged spectrum is complex and is dominated by overlapping spectral features . the most prominent features are emission lines of , , , and . they are b... |
astro-ph0210398 | c | in this manuscript , we presented the observational characteristics of the first high resolution time series fuv spectroscopy of the eclipsing nl , ux uma . our main results are as follows : 1 . the time - averaged fuv spectrum of ux uma is dominated by line emission from numerous , overlapping transitions of , ,... | we present far - ultraviolet ( 905 1182 ) , time - series spectroscopy of the eclipsing , novalike cataclysmic variable , ux uma , acquired with fuse . the time - averaged spectrum is complex and is dominated by overlapping spectral features . the fuv spectra show flickering on time scales of several minutes . we h... | we present far - ultraviolet ( 905 1182 ) , time - series spectroscopy of the eclipsing , novalike cataclysmic variable , ux uma , acquired with fuse . the time - averaged spectrum is complex and is dominated by overlapping spectral features . the most prominent features are emission lines of , , , and . they are b... |
1102.1983 | c | all of our models of the co and co@xmath0 gas were done using a single temperature slab model . we fit the @xmath13co r(16 - 19 ) transitions with the assumption the transitions are optically thin and found a temperature of 2887 k with column density @xmath18 ( see population diagram in fig . 7 ) . if we fit the high -... | we present findings for dg tau b and vv cra , two of the objects observed in our spitzer irs project to search for molecular absorption in edge - on disks , along with near - ir spectroscopy of the co fundamental transitions and mid - ir imaging . while the only gas absorption seen in the spitzer irs spectrum toward dg... | we present findings for dg tau b and vv cra , two of the objects observed in our spitzer irs project to search for molecular absorption in edge - on disks , along with near - ir spectroscopy of the co fundamental transitions and mid - ir imaging . while the only gas absorption seen in the spitzer irs spectrum toward dg... |
astro-ph0510836 | i | our study of the near - ir spectrum of p cygni s nebula has led to the main conclusions below : \1 . the near - ir spectrum of p cygni is dominated by collisionally - excited lines of [ fe ii ] , mainly from the three lowest terms . it closely resembles the near - ir spectrum of the homunculus nebula around @xmath5... | high - dispersion spectra of [ fe ii ] constrain the geometry , detailed structure , and kinematics of p cygni s nebula , which is the major product of p cygni s outburst in 1600 a.d . we propose that the dust which obscured the star after the outburst has since been largely destroyed , releasing fe into the gas phase... | we present moderate and high - dispersion 12.5 spectra of the-radius nebula around p cygni , dominated by bright emission lines of [ fe ii ] . observed [ fe ii ] line ratios disagree with theoretical transition rates in the literature , so we use the spectrum of p cygni s nebula to constrain the atomic data for low ... |
0901.0710 | i | in recent years dedicated searches and serendipitous discoveries have uncovered several optical transients with luminosities intermediate between the well - studied classes of nova eruptions ( @xmath7 mag ) and supernova ( sn ) explosions ( @xmath8 mag ) . as can be expected from the wide gap in luminosity , these inte... | we present multi - epoch high - resolution optical spectroscopy , uv / radio / x - ray imaging , and archival _ hubble _ and _ spitzer _ observations of an intermediate luminosity optical transient recently discovered in the nearby galaxy ngc300 . our high - resolution spectra , the first for this event , are dominated... | we present multi - epoch high - resolution optical spectroscopy , uv / radio / x - ray imaging , and archival _ hubble _ and _ spitzer _ observations of an intermediate luminosity optical transient recently discovered in the nearby galaxy ngc300 . we find that the transient ( ngc300ot2008 - 1 ) has a peak absolute magn... |
1409.0026 | i | a quantitative understanding of radiation transport in the cool molecule - dominated regions in planetary and ultracool dwarf atmospheres is essential to many aspects of understanding the temperature structure , thermal evolution , and formation of these objects . in freedman08 ( hereafter , f08 ) we presented a det... | we present new calculations of rosseland and planck gaseous mean opacities relevant to the atmospheres of giant planets and ultracool dwarfs . such calculations are used in modeling the atmospheres , interiors , formation , and evolution of these objects . our calculations are an expansion of those presented in freedma... | we present new calculations of rosseland and planck gaseous mean opacities relevant to the atmospheres of giant planets and ultracool dwarfs . such calculations are used in modeling the atmospheres , interiors , formation , and evolution of these objects . our calculations are an expansion of those presented in freedma... |
1107.5065 | i | understanding the formation and evolution of the first galaxies and the supermassive black holes ( smbhs ) they host is a key goal of both observational and theoretical astronomy . the first sample of more than twenty bright quasars at z@xmath06 were selected from the imaging data of the sloan digital sky survey ( here... | we present new millimeter and radio observations of nine z quasars discovered in deep optical and near - infrared surveys . combining with previous millimeter and radio observations , we study the fir and radio emission and quasar - host galaxy evolution with a sample of 18 z quasars that are faint at uv and optical wa... | we present new millimeter and radio observations of nine z quasars discovered in deep optical and near - infrared surveys . we observed the 250 ghz continuum in eight of the nine objects and detected three of them . new 1.4 ghz radio continuum data have been obtained for four sources , and one has been detected . we se... |
1107.5065 | c | we present observations of millimeter and radio continuum and co(6 - 5 ) line emission from the host galaxies of quasars at z@xmath06 . the new observations complete our mambo dust continuum survey of all the uv / optically faint z@xmath06 quasars ( @xmath2 ) discovered from sdss . combining with previous data , we cal... | we observed the 250 ghz continuum in eight of the nine objects and detected three of them . / millimeter - observed quasars at z to 5 , yields a relationship of . the millimeter continuum detections in the five objects and molecular co detections in three of them reveal a few of fir - emitting warm dust and of molecula... | we present new millimeter and radio observations of nine z quasars discovered in deep optical and near - infrared surveys . we observed the 250 ghz continuum in eight of the nine objects and detected three of them . new 1.4 ghz radio continuum data have been obtained for four sources , and one has been detected . we se... |
1611.05259 | i | luminous blue variables ( lbvs ) are evolved massive stars ( @xmath3 ) , intrinsically bright ( @xmath4 ) and hot ( o , b spectral type ) . they are unstable and exhibit spectroscopic and photometric variability . during the lbv variability cycle they can resemble a cooler supergiant of spectral type a or f , and show ... | we present new observations of the nebula around the magellanic candidate luminous blue variable s61 . these comprise high - resolution data acquired with the australia telescope compact array ( atca ) , the atacama large millimetre / submillimetre array ( alma ) , and visir at the very large telescope ( vlt ) . we pre... | we present new observations of the nebula around the magellanic candidate luminous blue variable s61 . these comprise high - resolution data acquired with the australia telescope compact array ( atca ) , the atacama large millimetre / submillimetre array ( alma ) , and visir at the very large telescope ( vlt ) . the ne... |
1611.05259 | c | starting from our best model in section [ sec : model ] , we now derive the mass - loss history of s61 with high temporal resolution , keeping in mind that we could not constrain the electron density distribution . if we know the expansion velocity of this nebula , each voxel of our datacube corresponds to a kinematica... | the 17 ghz atca map , with 0.8 arcsec resolution , allowed a morphological comparison with the _ hubble space telescope _ the spectral index map indicates that the radio emission is due to free - free transitions in the ionised , optically thin gas , but there are hints of inhomogeneities . | we present new observations of the nebula around the magellanic candidate luminous blue variable s61 . these comprise high - resolution data acquired with the australia telescope compact array ( atca ) , the atacama large millimetre / submillimetre array ( alma ) , and visir at the very large telescope ( vlt ) . the ne... |
1611.05259 | c | in this work we presented high spatial resolution observations from the radio to the mid - ir of the nebula associated with the candidate lbv s61 . it was detected only in the centimetre band . the nebula has a morphology resembling a shell , as in the optical , but in the radio there is more sub - structure . the emis... | the nebula was detected only in the radio , up to 17 ghz . the radio nebula resembles a spherical shell , as in the optical . we applied the code to model the electron density distribution in the s61 nebula . we found that different distributions fit the data , but all of them converge to the same ionised mass , , whic... | we present new observations of the nebula around the magellanic candidate luminous blue variable s61 . these comprise high - resolution data acquired with the australia telescope compact array ( atca ) , the atacama large millimetre / submillimetre array ( alma ) , and visir at the very large telescope ( vlt ) . the ne... |
astro-ph9909298 | i | within the standard picture for galaxy formation , in which galaxies are thought to form out of the gas which dissipatively collapses within the potential wells provided by virialized dark halos ( white & rees 1978 ) , disk galaxies take a special place . their flatness and rotational support suggest a relatively smoot... | we present new semi - analytical models for the formation of disk galaxies with the purpose of investigating the origin of the near - infrared tully - fisher ( tf ) relation . we emphasize the importance of extracting the proper luminosity and velocity measures from the models , something that has often been ignored in... | we present new semi - analytical models for the formation of disk galaxies with the purpose of investigating the origin of the near - infrared tully - fisher ( tf ) relation . the models assume that disks are formed by cooling of the baryons inside dark halos with realistic density profiles , and that the baryons conse... |
astro-ph9909298 | i | we have used new semi - analytical models to investigate the origin of the near - infrared tf relation . by focusing on the near - infrared we are less susceptible to uncertainties related to extinction by dust and stellar populations . as empirical constraint we have used the @xmath0-band tf relation of v97 , which is... | the introduction of the star formation threshold density proves an essential ingredient of our models , and yields gas mass fractions that are in excellent agreement with observations . we use the zero - point of the-band tf relation to place stringent constraints on cosmological parameters . the tf zero - point , in c... | we present new semi - analytical models for the formation of disk galaxies with the purpose of investigating the origin of the near - infrared tully - fisher ( tf ) relation . the models assume that disks are formed by cooling of the baryons inside dark halos with realistic density profiles , and that the baryons conse... |
astro-ph0611092 | i | the launch of the _ swift _ satellite @xcite has revolutionized the study of the interstellar medium of gamma - ray burst ( grb ) host galaxies and fostered new studies on the intervening intergalactic medium @xcite . while previous missions alerted the community to the existence of very bright grb afterglows ( e.g. * ... | we present optical echelle spectra of four gamma - ray burst ( grb ) afterglows ( grb 050730 , grb 050820 , grb 051111 , and grb 060418 ) discovered during the first 1.5 years of operation of the _ swift _ satellite and localized by either the _ swift _ telescope or follow - up ground - based imaging . we analyze ... | we present optical echelle spectra of four gamma - ray burst ( grb ) afterglows ( grb 050730 , grb 050820 , grb 051111 , and grb 060418 ) discovered during the first 1.5 years of operation of the _ swift _ satellite and localized by either the _ swift _ telescope or follow - up ground - based imaging . we analyze ... |
1107.2121 | c | our spectroscopic fitting clearly indicates that the compt and bb+bb models yield superior fits to the other possibilities . the compt model , with its power - law shape curtailed by an exponential turnover , is intended to mock - up the classic unsaturated comptonization spectrum realized in models of accretion disks ... | we also estimate for the first time event durations of soft gamma repeater ( sgr ) bursts in photon space ( i.e. , using their deconvolved spectra ) and find that these are very similar to thes estimated in count space ( following a log - normal distribution with a mean value ofms ) . we expand on the physical interpre... | we present our temporal and spectral analyses of 29 bursts from , detected with the gamma - ray burst monitor onboard the _ fermi _ gamma - ray space telescope during the 13 days of the source activation in 2008 ( august 22 to september 3 ) . we find that the durations of the bursts can be fit with a log - normal distr... |
astro-ph0702107 | i | the absolute magnitude of the lmc @xmath0 scuti star # 28114 in df05 catalog was determined from the @xmath1 relation of the galactic @xmath0 scuti stars ( equation 1 ) and from the theoretical modeling of the star light curves ( section 4 ) , deriving values of @xmath26=1.23@xmath137 and 1.21@xmath138 mag , respective... | the absolute magnitude of the variable was determined from the period - luminosity ( ) relation for galactic scuti stars and from the theoretical modeling of the observed light curves with nonlinear pulsation models . the two methods give distance moduli for the lmc of 18.46 0.19 and 18.48 0.15 , respectively , for a c... | we present results from a well studied scuti star discovered in the large magellanic cloud ( lmc ) . the absolute magnitude of the variable was determined from the period - luminosity ( ) relation for galactic scuti stars and from the theoretical modeling of the observed light curves with nonlinear pulsation models . t... |
astro-ph0401533 | c | we present a catalog of ngc 2264 x - ray sources . the observations were taken with the acis - i on board the chandra x - ray observatory . the catalog , consisting of 263 sources , includes x - ray luminosity , optical and infrared photometry and x - ray variability information . we found 41 variable sources , 14 of w... | the observations were taken with the acis - i camera with an exposure time of 48.1 ks . we present a catalog of 263 sources , which includes x - ray luminosity , optical and infrared photometry and x - ray variability information . we found 41 variable sources , 14 of which have a flare - like light curve , and 2 of wh... | we present results of a chandra observation of a field in ngc 2264 . the observations were taken with the acis - i camera with an exposure time of 48.1 ks . we present a catalog of 263 sources , which includes x - ray luminosity , optical and infrared photometry and x - ray variability information . we found 41 variabl... |
astro-ph0407438 | c | we have performed a single dish 21 cm h survey of 20 local lcbgs chosen to be local analogs to the numerous lcbgs studied at intermediate redshifts ( 0.4 @xmath0 z @xmath0 0.7 ) . our findings have verified results from intermediate redshift lcbg studies . we have found that local lcbgs are a morphologically hete... | we present single - dish h spectra obtained with the green bank telescope , along with optical photometric properties from the sloan digital sky survey , of 20 nearby ( d 70 mpc ) luminous compact blue galaxies ( lcbgs ) . thesel , blue , high surface brightness , starbursting galaxies were selected with the same ... | we present single - dish h spectra obtained with the green bank telescope , along with optical photometric properties from the sloan digital sky survey , of 20 nearby ( d 70 mpc ) luminous compact blue galaxies ( lcbgs ) . thesel , blue , high surface brightness , starbursting galaxies were selected with the same ... |
astro-ph9606111 | c | we have found disk and boundary layer solutions with significant departures from keplerian rotation that can reproduce the key spectral features of fu orionis and v1057 cygni . however , observations of these objects were originally modelled with reasonable success using standard keplerian disk theory ( hartmann & keny... | we present solutions for the accretion disks and boundary layers in pre - main - sequence stars undergoing fu orionis outbursts . they also have modest stellar rotation rates , comparable to the observed rotation rates of t tauri stars , and angular momentum accretion rates of zero . this supports our earlier suggestio... | we present solutions for the accretion disks and boundary layers in pre - main - sequence stars undergoing fu orionis outbursts . these solutions differ from earlier disk solutions in that they include a self - consistent treatment of the boundary layer region . in a previous paper ( popham 1996 ) , we showed that thes... |
astro-ph0506434 | i | studying the formation of our own solar system and observing the frequency of similar systems associated with other stars are two ways in which we seek to understand our origins . through remote observation and direct exploration , we have developed a much clearer understanding of our solar system . however many questi... | we present the discovery of debris systems around three solar mass stars based upon observations performed with the _ spitzer space telescope _ as part of a legacy science program , `` the formation and evolution of planetary systems '' ( feps ) . we also confirm the presence of debris around two other stars . we specu... | we present the discovery of debris systems around three solar mass stars based upon observations performed with the _ spitzer space telescope _ as part of a legacy science program , `` the formation and evolution of planetary systems '' ( feps ) . we also confirm the presence of debris around two other stars . all the ... |
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