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cond-mat0511225
i
in recent years substantial efforts have been invested in miniaturizing chemical processes by building microfluidic systems . the `` lab on a chip '' concept integrates a great variety of chemical and physical processes into a single device @xcite in a similar way as an integrated circuit incorporates many electronic d...
we investigate the flow of a nano - scale incompressible ridge of low - volatility liquid along a `` chemical channel '' : a long , straight , and completely wetting stripe embedded in a planar substrate , and sandwiched between two extended less wetting solid regions . pearling instability develops if the thickness of...
we investigate the flow of a nano - scale incompressible ridge of low - volatility liquid along a `` chemical channel '' : a long , straight , and completely wetting stripe embedded in a planar substrate , and sandwiched between two extended less wetting solid regions . molecular dynamics simulations , a simple long - ...
astro-ph0607095
i
advances in submillimeter continuum imaging techniques in the past decade have dramatically improved our understanding of the structure of the dense , cold interstellar medium ( ism ) in star - forming regions . in every region studied , the cold , dusty ism exhibits a clumpy , often filamentary structure whose density...
we investigate the mass function of cold , dusty clumps in 11 low- and high - mass star - forming regions . using a homogeneous fitting technique we find that the submillimeter continuum clump mass function in low - mass star - forming regions is typically best fit by a lognormal distribution , while that in high - mas...
we investigate the mass function of cold , dusty clumps in 11 low- and high - mass star - forming regions . using a homogeneous fitting technique , we analyze the shape of each region s clump mass function and examine the commonalities among them . we find that the submillimeter continuum clump mass function in low - m...
astro-ph0607095
i
in this paper , we have examined the issue of the functional form of the clump / core mass function derived from millimeter / submillimeter continuum observations of galactic star - forming regions . we have demonstrated that , even in the case of a strict single power - law mass function , great care must be taken in ...
fitting all of the regions with a double power law , we find the mean power law exponent at the high - mass end of each mass function is , consistent with the salpeter result of . this result is consistent with the hypothesis that the clump mass distribution is determined by a highly stochastic process , such as turbul...
we investigate the mass function of cold , dusty clumps in 11 low- and high - mass star - forming regions . using a homogeneous fitting technique , we analyze the shape of each region s clump mass function and examine the commonalities among them . we find that the submillimeter continuum clump mass function in low - m...
0904.3096
i
the rigorous , statistical confirmation of bimodality within the luminous ( @xmath0 mag ) , nearby galaxy population has proven a key result to emerge from modern wide - field imaging surveys implying the existence of two principal evolutionary pathways for bright systems . this bimodality is clearly evident in the di...
we investigate the origin of the galaxy color - concentration bimodality at the bright - end of the luminosity function ( mag ) with regard to the bulge - disc nature of galaxies . via ( 2d ) finally , within the two - component population we confirm a previously - reported correlation between bulge and disc color ( wi...
we investigate the origin of the galaxy color - concentration bimodality at the bright - end of the luminosity function ( mag ) with regard to the bulge - disc nature of galaxies . via ( 2d ) surface brightness profile modeling with gim2d , we subdivide the local galaxy population in the millennium galaxy catalogue int...
0904.3096
c
our key conclusions may be summarized as follows . via bulge - disc decomposition and quantitative morphological classification ( i.e. , the logical filter in @xcite ) of luminous ( @xmath0 mag ) , nearby ( @xmath35 ) galaxies in the mgc , we have demonstrated that : \(i ) one - component systems ( predominantly ell...
we reveal that one - component ( elliptical and disc - only ) systems define the two peaks of the galaxy color - concentration distribution ( with total stellar mass densities of and mpc respectively ) , while two - component systems contribute to both a bridging population and the red , concentrated peak ( with total ...
we investigate the origin of the galaxy color - concentration bimodality at the bright - end of the luminosity function ( mag ) with regard to the bulge - disc nature of galaxies . via ( 2d ) surface brightness profile modeling with gim2d , we subdivide the local galaxy population in the millennium galaxy catalogue int...
1302.2196
i
now that the higgs - like particle has been discovered in large hadron collider ( lhc ) @xcite , one of primary interests of particle physics is to understand mechanism of dynamical electroweak symmetry breaking . to settle down the unsolved issues including the hierarchy problem , there have been proposed several prom...
our result is qualitatively consistent with the recent lattice calculations . when fundamental quarks are introduced in addition to adjoint quarks , the split phase becomes more dominant and larger as a result of explicit center symmetry breaking . we study chiral properties in these theories and show that chiral conde...
we investigate the phase structure of gauge theory in four and five dimensions with one compact dimension by using perturbative one - loop and pnjl - model - based effective potentials , with emphasis on spontaneous gauge symmetry breaking . when adjoint matter with the periodic boundary condition is introduced , we ha...
1302.2196
i
in this paper we have studied the phase diagram for @xmath0 gauge theories with a compact spatial dimension by using the effective models , with emphasis on the dynamical gauge symmetry breaking . we show that introduction of adjoint matter with periodic boundary condition leads to the unusual phases with spontaneous g...
we investigate the phase structure of gauge theory in four and five dimensions with one compact dimension by using perturbative one - loop and pnjl - model - based effective potentials , with emphasis on spontaneous gauge symmetry breaking . when adjoint matter with the periodic boundary condition is introduced , we ha...
we investigate the phase structure of gauge theory in four and five dimensions with one compact dimension by using perturbative one - loop and pnjl - model - based effective potentials , with emphasis on spontaneous gauge symmetry breaking . when adjoint matter with the periodic boundary condition is introduced , we ha...
0812.1851
i
the astounding range of experimental and theoretical studies performed on carbon nanotubes @xcite has revealed a spectrum of physics characteristic of strongly correlated low - dimensional electronic systems @xcite . the underlying graphene lattice structure of these tubes uniquely affects band structure , effective ...
we investigate the properties of conduction electrons in single - walled armchair carbon nanotubes ( swnt ) in the presence of both transverse electric and magnetic fields . we find that these fields provide a controlled means of tuning low - energy band structure properties such as inducing gaps in the spectrum , brea...
we investigate the properties of conduction electrons in single - walled armchair carbon nanotubes ( swnt ) in the presence of both transverse electric and magnetic fields . we find that these fields provide a controlled means of tuning low - energy band structure properties such as inducing gaps in the spectrum , brea...
1209.3302
i
it has been known that nanostructures based on carbon possess unique mechanical , electrical and optical properties.@xcite among them particular attention has been given to graphene , a two - dimensional sheet of carbon atoms arranged in a hexagonal structure with low - energy electronic excitations described by the di...
we investigate the thermal casimir interaction of a suspended graphene described by the dirac model with a plate made of dielectric or metallic materials . we demonstrate that for a graphene with nonzero mass gap parameter the casimir free energy remains nearly constant ( and the thermal correction negligibly small ) o...
we investigate the thermal casimir interaction of a suspended graphene described by the dirac model with a plate made of dielectric or metallic materials . the reflection coefficients on graphene expressed in terms of a temperature - dependent polarization tensor are used . we demonstrate that for a graphene with nonze...
1209.3302
c
in the foregoing , we have investigated the casimir free energy and the thermal correction to the casimir energy at zero temperature for a suspended graphene sheet interacting with a material plate , either dielectric or metallic . in so doing graphene was described by the fully relativistic dirac model with temperatur...
the free energy is nearly the same , irrespective of whether the metal is nonmagnetic or magnetic and whether it is described using the drude- or plasma - model approaches . however , for nonmagnetic metals described by the plasma model and for magnetic metals , a severe dependence on the chosen theoretical description...
we investigate the thermal casimir interaction of a suspended graphene described by the dirac model with a plate made of dielectric or metallic materials . the reflection coefficients on graphene expressed in terms of a temperature - dependent polarization tensor are used . we demonstrate that for a graphene with nonze...
1509.04637
i
quantum markovian master equations are the simplest but also the most used cases of study for the dynamics of open quantum systems . the concept of open systems plays an important role since perfect isolation in the quantum realm and access to all degrees of freedom is not possible . the main source of inspiration was ...
we investigate two interacting open quantum systems whose time evolutions are governed by markovian master equations . we show a class of coupled systems whose interaction leaves invariant the steady state of one of the systems , i.e. , only one of the reduced steady states is sensitive to the interactions .
we investigate two interacting open quantum systems whose time evolutions are governed by markovian master equations . we show a class of coupled systems whose interaction leaves invariant the steady state of one of the systems , i.e. , only one of the reduced steady states is sensitive to the interactions . a detailed...
1502.05428
i
although the source - channel separation architecture is asymptotically optimal in the point - to - point communication setting @xcite as well as several classes of multiuser communication settings ( see _ e.g. , _ @xcite and references therein ) , uncoded schemes have several particularly attractive properties . first...
we investigate whether uncoded schemes are optimal for gaussian sources on multiuser gaussian channels . particularly , we consider two problems : the first is to send correlated gaussian sources on a gaussian broadcast channel where each receiver is interested in reconstructing only one source component ( or one speci...
we investigate whether uncoded schemes are optimal for gaussian sources on multiuser gaussian channels . particularly , we consider two problems : the first is to send correlated gaussian sources on a gaussian broadcast channel where each receiver is interested in reconstructing only one source component ( or one speci...
1205.5920
i
communication networks are presenting ever - increasing challenges in a wide range of applications , and there is great interest in inferential methods for exploiting the information they contain . a common source of such data is a corpus of time - stamped messages such as e - mails or sms ( short message service ) . s...
we model messaging activities as a hierarchical doubly stochastic point process with three main levels , and develop an iterative algorithm for inferring actors relative latent positions from a stream of messaging activity data . = 1 social network ; multiple doubly stochastic processes ; classification ; clustering...
we model messaging activities as a hierarchical doubly stochastic point process with three main levels , and develop an iterative algorithm for inferring actors relative latent positions from a stream of messaging activity data . each of the message - exchanging actors is modeled as a process in a latent space . the ac...
1205.5920
l
for statistical inference when there is information available beyond @xmath5 , the cox - proportional hazard model is a natural choice . in @xcite and @xcite , for instance , instantaneous intensity of messaging activities between each pair of actors is assumed to be a function of , in the language of generalized linea...
each of the message - exchanging actors is modeled as a process in a latent space . each actor s movement in the latent space is modeled as being governed by two parameters that we call confidence and visibility , in addition to dependence on the population distribution . the messaging frequency between a pair of actor...
we model messaging activities as a hierarchical doubly stochastic point process with three main levels , and develop an iterative algorithm for inferring actors relative latent positions from a stream of messaging activity data . each of the message - exchanging actors is modeled as a process in a latent space . the ac...
astro-ph0411655
i
of the sample of stars observed from the cfht , those with planets ( with the exception of 51 peg ) show significant night - to - night variations in their ca ii h and k reversals . @xmath5 ceti and the sun , which have no close planets , remained very steady throughout each of the four observing runs . hd 179949 a...
four stars display short - term ( days ) cyclical activity . for two , short - term chromospheric activity appears weakly dependent on the mean k - line reversal intensities for the sample of 13 stars . also , a suggestive correlation exists between this activity and thesin of the star s hot jupiter . because of their ...
we monitored the chromospheric activity in the ca ii h & k lines of 13 solar - type stars ( including the sun ) ; 8 of them over three years at the cfht and 5 in a single run at the vlt . ten of the 13 targets have close planetary companions . all of the stars observed at the cfht show long - term ( months to years ) c...
0903.0569
i
factorization theorems are fundamental to modern calculations in qcd of the amplitudes for hard - scattering exclusive hadronic processes . they allow one to separate contributions to the amplitudes that involve states of high virtuality from those that involve states of low virtuality . the former , short - distance c...
we outline a proof of factorization in exclusive processes , taking into account the presence of soft and collinear modes of arbitrarily low energy , which arise when the external lines of the process are taken on shell . specifically , we examine the process of annihilation through a virtual photon into two light meso...
we outline a proof of factorization in exclusive processes , taking into account the presence of soft and collinear modes of arbitrarily low energy , which arise when the external lines of the process are taken on shell . specifically , we examine the process of annihilation through a virtual photon into two light meso...
1212.5606
i
with what seems to be the recent discovery of the higgs boson @xcite , the high energy physics enters into the solitude of a path that no one knows where or how it may found new physics ( np ) . although a light higgs requires either , fine - tuning , or np at the tev scale , the experimental results do not show any hi...
we perform a general parton level analysis for the search of heavy resonant states in the production of pairs at the lhc with an integrated luminosity of 30 fb . we assume the existence of resonances that only couple to quarks and propose kinematic cuts in order to increase the amount of events produced through quark -...
we perform a general parton level analysis for the search of heavy resonant states in the production of pairs at the lhc with an integrated luminosity of 30 fb . we assume the existence of resonances that only couple to quarks and propose kinematic cuts in order to increase the amount of events produced through quark -...
1412.1103
c
the distribution of matter at small scales may provide insights on the nature of dark matter particles and potentially constrain scenarios alternative to the standard cold dark matter paradigm . in this work we have performed a first study of the nonlinear clustering of late - forming dark matter using a suite of high ...
we perform a study of the nonlinear clustering of matter in the late - forming dark matter ( lfdm ) scenario in which dark matter results from the transition of a nonminimally coupled scalar field from radiation to collisionless matter . the analysis of the lfdm halo velocity function shows a better agreement than thec...
we perform a study of the nonlinear clustering of matter in the late - forming dark matter ( lfdm ) scenario in which dark matter results from the transition of a nonminimally coupled scalar field from radiation to collisionless matter . a distinct feature of this model is the presence of a damped oscillatory cutoff in...
hep-th0109125
i
noncommutative field theories@xcite@xcite are obtained in an @xmath7 limit of the open string theory . this noncommutativity is inherent in the open string theory@xcite . by considering an open string in an ns - ns @xmath0 field background and taking a specific field theory limit the effects of the @xmath0 field are en...
the degrees of the freedom associated with both ends are not decoupled and accordingly , the effective action must be quite different from that of the ordinary noncommutative gauge theory for a constant background . we will then propose a prescription for reducing this bi - local effective action to that in dimensions ...
we point out that when a d - brane is placed in an ns - ns field background with non - vanishing field strength ( ) along the d - brane worldvolume , the coordinate of one end of the open string does not commute with that of the other in the low energy limit . the degrees of the freedom associated with both ends are no...
gr-qc0404080
i
investigations on how the spacetime structures would be during and after gravitational collapses are important topics in gravitational physics and spacetime physics . nonlinear nature of gravity is making our understanding of the phenomena very difficult , both conceptually and technically . steady development of numer...
the model has been introduced previously but has been awaiting for proper analysis . here the analysis is put forward : it is proved that , as far as the weak energy condition is satisfied outside the shell , the collapsing shell bounces back at some point irrespective of the initial conditions , and escapes from the s...
we prepare a general framework for analyzing the dynamics of a cylindrical shell in the spacetime with cylindrical symmetry . based on the framework , we investigate a particular model of a cylindrical shell - collapse with rotational pressure , accompanying the radiation of gravitational waves and massless particles ....
gr-qc0404080
i
in this paper , we have studied the dynamics of a cylindrical shell in the spacetime cylindrical symmetry . we have started with constructing a general framework for analyzing a cylindrical spacetime and a shell in it , which might be useful for future investigations . based on the framework , we have investigated a cy...
we prepare a general framework for analyzing the dynamics of a cylindrical shell in the spacetime with cylindrical symmetry . based on the framework , we investigate a particular model of a cylindrical shell - collapse with rotational pressure , accompanying the radiation of gravitational waves and massless particles ....
we prepare a general framework for analyzing the dynamics of a cylindrical shell in the spacetime with cylindrical symmetry . based on the framework , we investigate a particular model of a cylindrical shell - collapse with rotational pressure , accompanying the radiation of gravitational waves and massless particles ....
0707.2865
c
the observations of 3c227 , 327 and 390.3 almost all show differences between the structure observed in the radio and that observed in the x - ray . to summarize , the only ` simple ' hotspots seen in these three objects are the weak compact components in the e hotspot of 3c227 and ( probably ) the s hotspot of 3c390.3...
we find that in fact some secondary hotspots are x - ray sources , and thus probably locations for high - energy particle acceleration after the initial jet termination shock . in detail , though , we show that the spatial structures seen in x - ray are not consistent with nave expectations from a simple shock model : ...
we present _ chandra _ observations of a small sample of nearby classical double radio galaxies which have more than one radio hotspot in at least one of their lobes . the x - ray emission from the hotspots of these comparatively low - power objects is expected to be synchrotron in origin , and therefore to provide inf...
0707.2865
c
we have looked with very high spatial resolution at the hotspot x - ray emission from a small sample of radio galaxies that show multiple radio hotspots . as in earlier work , we argue that the x - ray emission from the hotspots comes predominantly from the synchrotron process , and so traces high - energy particle acc...
the x - ray emission from the hotspots of these comparatively low - power objects is expected to be synchrotron in origin , and therefore to provide information about the locations of high - energy particle acceleration . in some models of the relationship between the jet and hotspot the hotspots that are not the curre...
we present _ chandra _ observations of a small sample of nearby classical double radio galaxies which have more than one radio hotspot in at least one of their lobes . the x - ray emission from the hotspots of these comparatively low - power objects is expected to be synchrotron in origin , and therefore to provide inf...
astro-ph0105043
i
the hubble deep field north ( * ? ? ? * hereafter w96 ) ranks among the most thoroughly studied portions of the extragalactic universe . the extremely deep multi color images obtained with the wfpc2 camera on the _ hubble space telescope _ , reaching ab mag @xmath5 with 0@xmath61 resolution , have revolutionized our u...
we present a catalog of 74 galaxies detected serendipitously during a campaign of spectroscopic observations of the hubble deep field north ( hdf ) and its environs . among the identified objects are five candidate lyemitters at , a galaxy cluster at , and a chandra source with a heretofore undetermined redshift of . o...
we present a catalog of 74 galaxies detected serendipitously during a campaign of spectroscopic observations of the hubble deep field north ( hdf ) and its environs . among the identified objects are five candidate lyemitters at , a galaxy cluster at , and a chandra source with a heretofore undetermined redshift of . w...
astro-ph0105043
c
the 74 galaxies in the serendipitous catalog span the redshift range @xmath57 , with a median redshift of @xmath2 . the vast majority of the galaxies are emission - line systems ; 5% of the sample show only absorption lines . this bias stems from the diminished likelihood of serendipitously detecting an absorption lin...
we discuss the redshift distribution of the serendipitous sample , which contains galaxies in the range with a median redshift of , and we present strong evidence for redshift clustering . by comparing our spectroscopic redshifts to optical / ir photometric studies of the hdf , we find that photometric redshifts are in...
we present a catalog of 74 galaxies detected serendipitously during a campaign of spectroscopic observations of the hubble deep field north ( hdf ) and its environs . among the identified objects are five candidate lyemitters at , a galaxy cluster at , and a chandra source with a heretofore undetermined redshift of . w...
astro-ph0603163
r
as we described in section [ sec : confused ] , there are many definitions for the source confusion . we compare these definitions and propose an appropriate definition for source confusion . in table [ tab_inst_para ] , we list the basic instrumental parameters of present and future ir space missions ; the aperture of...
we present a comprehensive analysis for the determination of the confusion levels for the current and the next generation of far - infrared surveys assuming three different cosmological evolutionary scenarios . we use our derived sensitivities to suggest best survey strategies for the current and the future far - infra...
we present a comprehensive analysis for the determination of the confusion levels for the current and the next generation of far - infrared surveys assuming three different cosmological evolutionary scenarios . we include an extensive model for diffuse emission from infrared cirrus in order to derive absolute sensitivi...
0805.2980
i
there is currently considerable interest in preparing exotic quantum states of many - body systems which can be used as resource states for measurement - based quantum computation ( mbqc ) that is , quantum computation that proceeds solely through local adaptive measurements on single quantum systems @xcite . the can...
we present a general procedure for constructing lattices of qubits with a hamiltonian composed of nearest - neighbour two - body interactions such that the ground state encodes a cluster state . we give specific details for lattices in one- , two- , and three - dimensions , investigating both periodic and fixed boundar...
we present a general procedure for constructing lattices of qubits with a hamiltonian composed of nearest - neighbour two - body interactions such that the ground state encodes a cluster state . we give specific details for lattices in one- , two- , and three - dimensions , investigating both periodic and fixed boundar...
1403.0005
i
we have presented a green s function formalism , which can correctly describe two required conditions for any consistent theory of bose einstein condensates ( becs ) : ( i ) the infrared divergence of the longitudinal susceptibility in the low - energy and low - momentum limit , as well as ( ii ) the nepomnyashchii n...
we present a green s function formalism for an interacting bose einstein condensate ( bec ) satisfying the two required conditions : ( i ) the infrared - divergent longitudinal susceptibility with respect to the bec order parameter , and ( ii ) the nepomnyashchii these conditions can not be described by the ordinary ...
we present a green s function formalism for an interacting bose einstein condensate ( bec ) satisfying the two required conditions : ( i ) the infrared - divergent longitudinal susceptibility with respect to the bec order parameter , and ( ii ) the nepomnyashchii nepomnyashchii identity stating the vanishing off - di...
1201.0910
i
previously , we have compared the quality of fit provided by atmospheric models , high resolution synthetic spectra , and spectral energy distributions ( seds , @xmath4 ) computed both in lte , and with many opacity sources treated in self - consistent non - lte ( nlte ) , for the the sun and the standard stars procyon...
we present a grid of atmospheric models and synthetic spectral energy distributions ( seds ) for late - type dwarfs and giants of solar and 1/3 solar metallicity with many opacity sources computed in self - consistent non - local thermodynamic equilibrium ( nlte ) , and compare them to the lte grid of ( paper i ) .
we present a grid of atmospheric models and synthetic spectral energy distributions ( seds ) for late - type dwarfs and giants of solar and 1/3 solar metallicity with many opacity sources computed in self - consistent non - local thermodynamic equilibrium ( nlte ) , and compare them to the lte grid of ( paper i ) . we ...
0905.3556
i
gas transport to the centers of galaxies is still mainly an unsolved problem ( e.g. * ? ? ? since most of this gas is residing in a rotating disk well beyond the center , it is essentially a problem of angular momentum transport . proposed transport mechanisms range from galactic interactions and bars , to nuclear bars...
three_-arm spiral in the non - circular motions , which agrees with a _ this nuclear spiral is consistent with a weak perturbation in the gravitational potential due to a two - arm logarithmic spiral , with a pitch angle of derived directly from the harmonic expansion of the velocity field . next , we use a simple spi...
we present a harmonic expansion of the observed line - of - sight velocity field as a method to recover and investigate spiral structures in the nuclear regions of galaxies . application to the emission - line velocity field within the circumnuclear starforming ring of ngc1097 , obtained with the gmos - ifu spectrogra...
0905.3556
i
we presented harmonic expansion of the line - of - sight velocity field as a suitable method to identify and quantify possible structures in the non - circular motions , including nuclear spirals . we showed that a weak perturbation in the gravitational potential of harmonic number @xmath47 , causes the surface brightn...
we present a harmonic expansion of the observed line - of - sight velocity field as a method to recover and investigate spiral structures in the nuclear regions of galaxies . application to the emission - line velocity field within the circumnuclear starforming ring of ngc1097 , obtained with the gmos - ifu spectrogra...
we present a harmonic expansion of the observed line - of - sight velocity field as a method to recover and investigate spiral structures in the nuclear regions of galaxies . application to the emission - line velocity field within the circumnuclear starforming ring of ngc1097 , obtained with the gmos - ifu spectrogra...
1702.06957
c
using data taken with the sdss boss spectrograph , we have compiled a new empirical stellar template library . our template library : * covers spectral types o5 through l3 * includes dwarf and giant separation for spectral types a0 through m8 * contains metallicity [ fe / h ] bins for spectral types a3 through m8 * ...
the templates cover spectral types o5 through l3 , are binned by metallicity from -2.0 dex through + 1.0 dex and are separated into main sequence ( dwarf ) stars and giant stars . with recently developed m dwarf metallicity indicators , we identify trends in color space with metallicity and surface gravity , which will...
we present a library of empirical stellar spectra created using spectra from the sloan digital sky survey s baryon oscillation spectroscopic survey ( boss ) . the templates cover spectral types o5 through l3 , are binned by metallicity from -2.0 dex through + 1.0 dex and are separated into main sequence ( dwarf ) stars...
1205.5930
i
we are concerned with weakly nonlinear geometric optics for entropy solutions of the following hyperbolic system of conservation laws : @xmath2 where @xmath3 : @xmath4 is a smooth function . the jacobian matrix @xmath5 is diagonalizable at any point @xmath6 and has @xmath7 real eigenvalues such that any eigenvalue has ...
we present a new approach to analyze the validation of weakly nonlinear geometric optics for entropy solutions of nonlinear hyperbolic systems of conservation laws whose eigenvalues are allowed to have constant multiplicity and corresponding characteristic fields to be linearly degenerate . the approach is based on our...
we present a new approach to analyze the validation of weakly nonlinear geometric optics for entropy solutions of nonlinear hyperbolic systems of conservation laws whose eigenvalues are allowed to have constant multiplicity and corresponding characteristic fields to be linearly degenerate . the approach is based on our...
1208.0714
i
approximately half of the elements heavier than iron in the universe are produced via a series of @xmath12 neutron capture reactions and competing @xmath13-decays ( the @xmath9-process ) . during the @xmath9-process , the neutron number density is relatively low , of the order of 10@xmath14 n @xmath15 . when the flux r...
this is believed to have a strong effect on the rate of thec(,)o reaction , the main neutron source for _ slow _ neutron captures ( the-process ) in asymptotic giant branch ( agb ) stars . we use the new rate and different rates available in the literature as input in simulations of agb stars to study their influence o...
we present a new measurement of the-spectroscopic factor ( ) and the asymptotic normalization coefficient ( anc ) for the 6.356 mev 1/2 subthreshold state ofo through thec(b,li)o transfer reaction and we determine the-width of this state . this is believed to have a strong effect on the rate of thec(,)o reaction , the ...
1208.0714
i
we determined the stellar rate of the @xmath4c(@xmath0,@xmath7)@xmath8o reaction and incorporated the new reaction rate in calculations of the @xmath9-process nucleosynthesis in agb stars . the @xmath1 and anc for the 6.356 mev 1/2@xmath2 subthreshold state in @xmath3o were obtained from the measurement of the @xmath4c...
we present a new measurement of the-spectroscopic factor ( ) and the asymptotic normalization coefficient ( anc ) for the 6.356 mev 1/2 subthreshold state ofo through thec(b,li)o transfer reaction and we determine the-width of this state . based on the new width we derive the astrophysical s - factor and the stellar ra...
we present a new measurement of the-spectroscopic factor ( ) and the asymptotic normalization coefficient ( anc ) for the 6.356 mev 1/2 subthreshold state ofo through thec(b,li)o transfer reaction and we determine the-width of this state . this is believed to have a strong effect on the rate of thec(,)o reaction , the ...
0810.2119
i
we have presented mass models for the nearby dwarf galaxies , ic 2574 and ngc 2366 , derived using the high - resolution data from things . these high - resolution data do not suffer from beam smearing , have a well - defined dynamical center and enable us to examine in detail the dark matter distribution of these gala...
the bulk velocity field rotation curves are significantly less affected by non - circular motions and constrain the dark matter distribution in our galaxies , allowing us to address the discrepancy between the inferred and predicted dark matter distribution in galaxies ( the `` cusp / core '' problem ) . _ # 1 # 1#1
we present a new method to remove the impact of random and small - scale non - circular motions from hi velocity fields in ( dwarf ) galaxies in order to better constrain the dark matter properties for these objects . this method extracts the circularly rotating velocity components from the hi data cube and condenses t...
astro-ph0004391
c
we present a new code which is designed to derive a sed for an arbitrary spatial distribution of stellar and gaseous components for a dusty starburst galaxy . by using this code , we can calculate seds based on numerical simulations that can analyze simultaneously dynamical and chemical evolution , structural and kinem...
we present a new numerical code which is designed to derive a spectral energy distribution ( sed ) for an arbitrary spatial distribution of stellar and gaseous components in a dusty starburst galaxy . as an example , we demonstrate when and how a major galaxy merger with dusty starburst becomes an ultra - luminous infr...
we present a new numerical code which is designed to derive a spectral energy distribution ( sed ) for an arbitrary spatial distribution of stellar and gaseous components in a dusty starburst galaxy . we apply a ray tracing method to numerical simulations and thereby estimate extinction and reemission of stellar light ...
1105.5683
i
the magnetohydrodynamics ( mhd ) approximation has some interesting properties , for example , the flux freezing and magnetic pressure ; the former can be used for the collimation of the jet , and the latter for the acceleration of the plasma . thus , the magnetic field is considered an essential ingredient for many as...
we present a new numerical method of special relativistic resistive magnetohydrodynamics with scalar resistivity that can treat a range of phenomena , from nonrelativistic to relativistic ( shock , contact discontinuity , and alfvn wave ) . our new scheme is particularly well suited to systems with initially weak magne...
we present a new numerical method of special relativistic resistive magnetohydrodynamics with scalar resistivity that can treat a range of phenomena , from nonrelativistic to relativistic ( shock , contact discontinuity , and alfvn wave ) . the present scheme calculates the numerical flux of fluid by using an approxima...
1105.5683
c
in this paper , we have presented a new numerical scheme of resistive rmhd for one - dimensional case which can solve matter dominated problems more accurately than the existing numerical method . since this new scheme uses different characteristic velocity for obtaining the numerical flux of fluid and electromagnetic ...
since this scheme uses appropriate characteristic velocities , it is capable of accurately solving problems that can not be approximated as ideal magnetohydrodynamics and whose characteristic velocity is much lower than light velocity . the numerical results show that our scheme can solve the above problems as well as ...
we present a new numerical method of special relativistic resistive magnetohydrodynamics with scalar resistivity that can treat a range of phenomena , from nonrelativistic to relativistic ( shock , contact discontinuity , and alfvn wave ) . the present scheme calculates the numerical flux of fluid by using an approxima...
0901.3790
r
we now test the validity of our theory by comparing our predictions against known experimental results in hot vapors , viz . in a he * cell @xcite . for he * , collisions are expected to play a favorable role through five different effects : ( i ) vccs enable one to span the entire doppler profile quickly and efficient...
velocity - changing collisions ( vccs ) are modeled in the strong collision limit effectively , which helps in achieving optical pumping by the coupling beam across the entire doppler profile . the predictions , taking into account a dynamic rate of influx of atoms in the two lower levels of the , are in excellent agre...
we present a realistic theoretical treatment of a three - level system in a hot atomic vapor interacting with a coupling and a probe field of arbitrary strengths , leading to electromagnetically - induced transparency and slow light under the two - photon resonance condition . we take into account all the relevant deco...
0901.3790
c
we have presented a realistic analysis of eit and slow light in a hot atomic vapor , taking into account all the relevant decoherence processes , for arbitrary strengths of the probe and the coupling fields , and without assuming any special initial condition . we have considered the influx of fresh atoms in the lower ...
we present a realistic theoretical treatment of a three - level system in a hot atomic vapor interacting with a coupling and a probe field of arbitrary strengths , leading to electromagnetically - induced transparency and slow light under the two - photon resonance condition . the steady - state expressions for the ato...
we present a realistic theoretical treatment of a three - level system in a hot atomic vapor interacting with a coupling and a probe field of arbitrary strengths , leading to electromagnetically - induced transparency and slow light under the two - photon resonance condition . we take into account all the relevant deco...
1306.6073
i
the importance of chiral symmetry in hadron physics has been understood for more than 50 years . as an explicit lagrangian representation of the approximate chiral symmetry ( pcac ) that had been recognized in low energy pion nucleon interactions , gell - mann and levy @xcite constructed the extremely successful linea...
vertex and wave function renormalization constants are computed to lowest order in the pion field , including their nonanalytic behavior in the chiral limit , and studied numerically as a function of the ultraviolet cutoff . particular care is taken to explicitly verify gauge invariance and ward - takahashi identity co...
we present a relativistic formulation of pion loop corrections to the coupling of photons with nucleons on the light - front . vertex and wave function renormalization constants are computed to lowest order in the pion field , including their nonanalytic behavior in the chiral limit , and studied numerically as a funct...
1306.6073
c
in this work we have presented a detailed analysis of pion cloud corrections to the electromagnetic coupling of the nucleon , using the lowest order effective lagrangian constrained by the chiral symmetry of qcd . we have computed the complete set of vertex corrections arising from the various one - loop diagrams , inc...
we present a relativistic formulation of pion loop corrections to the coupling of photons with nucleons on the light - front . the results are used to compute the chiral corrections to matrix elements of local operators , related to moments of deep - inelastic structure functions . finally , comparison of results for p...
we present a relativistic formulation of pion loop corrections to the coupling of photons with nucleons on the light - front . vertex and wave function renormalization constants are computed to lowest order in the pion field , including their nonanalytic behavior in the chiral limit , and studied numerically as a funct...
astro-ph9810374
i
the discovery that the sky distribution of faint gamma - ray bursts ( grbs ) is isotropic , coupled with the confirmation of a roll - over in the cumulative brightness distribution of the bursts , suggested that the bursts lie at cosmological distances ( @xcite ) . about one year ago , the rapid dissemination of arcmin...
we present a rigorous method , based on bayesian inference , for calculating the odds favoring the hypothesis that any particular class of astronomical transients produce gamma - ray bursts over the hypothesis that they do not . we then apply this method to a sample of 83 type ia supernovae and a sample of 20 type ib -...
we present a rigorous method , based on bayesian inference , for calculating the odds favoring the hypothesis that any particular class of astronomical transients produce gamma - ray bursts over the hypothesis that they do not . we then apply this method to a sample of 83 type ia supernovae and a sample of 20 type ib -...
quant-ph0211134
i
the generation of non - classical states of light has been central to the confirmation and elucidation of the quantum theory of radiation . today , such work takes on an added importance as part of the advancing field of deliberate quantum state engineering , motivated in part by applications in quantum communication a...
the method applies an external laser pulse that generates an-photon output state while adiabatically keeping the atom - cavity system within a subspace of optically dark states . we present analytical estimates of the error due to amplitude leakage from these dark states for general , and compare it with explicit resul...
we present a scheme for the deterministic generation of-photon fock states from three - level atoms in a high - finesse optical cavity . the method applies an external laser pulse that generates an-photon output state while adiabatically keeping the atom - cavity system within a subspace of optically dark states . we p...
0903.1731
i
the galaxy populations of clusters are dominated by galaxies of early morphological type , ellipticals and s0s , which form a tight color magnitude relation ( cmr ) or ` red sequence ' . for decades , this relation was interpreted as evidence that the stars in early type galaxies in clusters are uniformly old , being ...
we present a study of the morphological fractions and color magnitude relation in the most distant x - ray selected galaxy cluster currently known , xmmxcs j at , using a combination of optical imaging data obtained with the _ hubble space telescope _ in contrast to observations of some other clusters , we find a lack...
we present a study of the morphological fractions and color magnitude relation in the most distant x - ray selected galaxy cluster currently known , xmmxcs j at , using a combination of optical imaging data obtained with the _ hubble space telescope _ advanced camera for surveys , and infrared data from the multi - ob...
0903.1731
c
we have conducted a study of the morphological fractions and color magnitude relation in the galaxy cluster xmmxcs j@xmath0 at @xmath1 . this is the first such study of an x - ray selected cluster at @xmath268 . we found : 1 . the brightest members of j@xmath0 have @xmath41 magnitudes corresponding to the expected ...
subaru _ telescope . therefore early type galaxies were already entrenched as the dominant galaxy population in at least some clusters approximately gyr after the big bang . we measure the color magnitude relations for the early type galaxies , finding that the slope in the relation is consistent with that measured in...
we present a study of the morphological fractions and color magnitude relation in the most distant x - ray selected galaxy cluster currently known , xmmxcs j at , using a combination of optical imaging data obtained with the _ hubble space telescope _ advanced camera for surveys , and infrared data from the multi - ob...
1206.6031
i
photoelectron spectroscopy is a widely used technique to analyze the electronic structure of complex systems @xcite . the advent of intense ultra - short laser sources has extended the range of applicability of this technique to a vast variety of non - linear phenomena like high - harmonic generation , above - thresho...
we present a time - dependent density - functional method able to describe the photoelectron spectrum of atoms and molecules when excited by laser pulses . this computationally feasible scheme is based on a geometrical partitioning that efficiently gives access to photoelectron spectroscopy in time - dependent density ...
we present a time - dependent density - functional method able to describe the photoelectron spectrum of atoms and molecules when excited by laser pulses . this computationally feasible scheme is based on a geometrical partitioning that efficiently gives access to photoelectron spectroscopy in time - dependent density ...
0809.1326
i
the history of our universe is largely unknown between the surface of last scattering ( @xmath0 ) down to a redshift of about 6 . because of the dearth of radiating sources and the fact that we know very little about this epoch , it is often referred to as the `` dark ages '' . theoretical models suggest that around re...
we present an efficient method to generate large simulations of the epoch of reionization ( eor ) without the need for a full 3-dimensional radiative transfer code . large dark - matter - only simulations are post - processed to produce maps of the redshifted 21 cm emission from neutral hydrogen . dark matter haloes ar...
we present an efficient method to generate large simulations of the epoch of reionization ( eor ) without the need for a full 3-dimensional radiative transfer code . large dark - matter - only simulations are post - processed to produce maps of the redshifted 21 cm emission from neutral hydrogen . dark matter haloes ar...
1506.08439
i
lvy processes play a large rle in contemporary mathematical finance @xcite , but also in many areas of physics , see e.g. @xcite . a real valued lvy process is a stochastic process @xmath2 that has increments @xmath3 , @xmath4 , that are independent of the past . the increments are also stationary in the sense that the...
we present an optimal control approach to the problem of model calibration for lvy processes based on a non parametric estimation procedure . the calibration problem is of considerable interest in mathematical finance and beyond . calibration of lvy processes is particularly challenging as the jump distribution is give...
we present an optimal control approach to the problem of model calibration for lvy processes based on a non parametric estimation procedure . the calibration problem is of considerable interest in mathematical finance and beyond . calibration of lvy processes is particularly challenging as the jump distribution is give...
astro-ph0007296
i
the trojans are a distant group of asteroids dynamically linked to jupiter by a 1:1 mean motion resonance which causes them to librate about stable lagrangian equilibrium points located @xmath4 in front of ( l4 ) and behind ( l5 ) jupiter along its orbit . because trojans orbit far from the sun and also have low albedo...
we present analytic and numerical results which illustrate the effects of jupiter s accretion of nebular gas and the planet s radial migration on its trojan companions . key words : + asteroids , dynamics + celestial mechanics + jupiter + origin , solar system + resonances + astronomy department , university of mary...
we present analytic and numerical results which illustrate the effects of jupiter s accretion of nebular gas and the planet s radial migration on its trojan companions . initially , we approximate the system by the planar circular restricted three - body problem and assume small trojan libration amplitudes . employing ...
astro-ph0007296
r
consider the planar circular restricted three - body problem , in which two massive bodies move about each other in circular orbits due to their mutual gravitation and a third body of infinitesimal mass moves in the orbital plane of the two massive objects . this system admits five equilibrium points where a test parti...
hamilton + astronomy department + university of maryland + college park , md 20742 - 2421 + tel : ( 301 ) 405 - 1548 + fax : ( 301 ) 314 - 9067 + e - mail : hamilton@astro.umd.edu + submitted to _ icarus _ : june 16 , 1999 + revised : + 41 pages + 13 figures and 2 tables + running head : origin of the trojan asteroi...
we present analytic and numerical results which illustrate the effects of jupiter s accretion of nebular gas and the planet s radial migration on its trojan companions . initially , we approximate the system by the planar circular restricted three - body problem and assume small trojan libration amplitudes . employing ...
astro-ph0007296
c
we have shown with both a simple adiabatic calculation and numerical simulations , that slow changes to the mass and semimajor axis of jupiter cause the trojan libration amplitude to vary according to the relation : @xmath148 for trojans with small libration amplitudes , small eccentricities , and small inclinations , ...
initially , we approximate the system by the planar circular restricted three - body problem and assume small trojan libration amplitudes . employing an adiabatic invariant calculation , we show that jupiter s thirty - fold growth from a core to its present mass causes the libration amplitudes of trojan asteroids to sh...
we present analytic and numerical results which illustrate the effects of jupiter s accretion of nebular gas and the planet s radial migration on its trojan companions . initially , we approximate the system by the planar circular restricted three - body problem and assume small trojan libration amplitudes . employing ...
astro-ph0305279
i
the sun s magnetic activity is expected to have greatly decreased with time ( skumanich 1972 ; simon , boesgaard , & herbig 1985 ; dorren & guinan 1994 ; guinan , ribas , & harper 2002 ) as the solar rotation slows down because of angular momentum loss in the stellar wind and resultant reduction in magnetic dynamo - re...
the emission features in the fuse 9201180 wavelength range allow for a critical probe of the hot plasma over three decades in temperature : k for the h i lyman series to k for the coronal fe xviii line . using the flux ratio c iii/ as diagnostics , we investigate the dependence of the electron pressure of the tra...
we present and analyze _ far ultraviolet spectroscopic explorer _ ( fuse ) observations of six solar analogs . these are single , main - sequence g05 stars selected as proxies for the sun at several stages of its main - sequence lifetime from myr up to gyr . the emission features in the fuse 9201180 wavelength range ...
astro-ph0305279
c
in this study we have utilized fuv spectra acquired with the fuse satellite to investigate the fuv emission characteristics of solar analogs . our six targets are well - known g05 solar - type stars especially selected to serve as proxies for the sun at different ages , nearly covering the entire solar main sequence li...
we present and analyze _ far ultraviolet spectroscopic explorer _ ( fuse ) observations of six solar analogs . these are single , main - sequence g05 stars selected as proxies for the sun at several stages of its main - sequence lifetime from myr up to gyr . the emission flux evolution with age or rotation period is we...
we present and analyze _ far ultraviolet spectroscopic explorer _ ( fuse ) observations of six solar analogs . these are single , main - sequence g05 stars selected as proxies for the sun at several stages of its main - sequence lifetime from myr up to gyr . the emission features in the fuse 9201180 wavelength range ...
1303.0884
c
various mechanisms have been proposed as sources of excitation in the nebulae , including photoionisation by radiation from the agn , cluster x - rays , or hot stars , collisional heating by high - energy particles , shocks or cloud - cloud collisions , and conduction of heat from the x - ray corona ( peterson et al . ...
based on optical diagnostic ratios ( [ oiii]/h against [ nii]/h , [ sii],6731/h , and [ oi]/h ) , all galaxies show extended liner emission , but that at least one has significant seyfert emission areas , and at least one other has significant hii like emission line ratios for many pixels .
we present detailed integral field unit ( ifu ) observations of the central few kiloparsecs of the ionised nebulae surrounding four active central cluster galaxies ( ccgs ) in cooling flow clusters ( abell 0496 , 0780 , 1644 and 2052 ) . our sample consists of ccgs with h filaments , and have existing data from the x -...
1303.0884
c
we present detailed integral field unit ( ifu ) observations of the central few kiloparsecs of the ionised nebulae surrounding four active ccgs in cooling flow clusters ( abell 0496 , 0780 , 1644 and 2052 ) . our sample consists of ccgs with h@xmath0 filaments . we observed the detailed optical emission - line ( and si...
we present detailed integral field unit ( ifu ) observations of the central few kiloparsecs of the ionised nebulae surrounding four active central cluster galaxies ( ccgs ) in cooling flow clusters ( abell 0496 , 0780 , 1644 and 2052 ) . our sample consists of ccgs with h filaments , and have existing data from the x -...
we present detailed integral field unit ( ifu ) observations of the central few kiloparsecs of the ionised nebulae surrounding four active central cluster galaxies ( ccgs ) in cooling flow clusters ( abell 0496 , 0780 , 1644 and 2052 ) . our sample consists of ccgs with h filaments , and have existing data from the x -...
astro-ph9701036
i
the study of the stellar populations and the distribution of metallicities plays an important role in our understanding of the star formation history of the galaxies . their stellar populations are expected to be more complex than those of , for example , globular clusters , which are thought to be composed of a single...
_ 1996 ) to new high quality observational data of the nuclear regions of two representative elliptical galaxies and the bulge of the sombrero galaxy . here we fit in detail absorption lines and 6 optical and near - infrared colors following two approaches : fitting a single - age single - metallicity model and fitting...
we present here the results of applying a new chemo - evolutionary stellar population model developed by ourselves in a previous paper ( vazdekis _ et al . _ 1996 ) to new high quality observational data of the nuclear regions of two representative elliptical galaxies and the bulge of the sombrero galaxy . here we fit ...
astro-ph9701036
c
we have obtained high quality observations of almost the whole set of line - indices of the extended lick - system for three representative early - type galaxies , and have applied a new spectrophotometric chemo - evolutionary population synthesis model developed by ourselves in a previous paper ( paper i ) . we can ma...
we present here the results of applying a new chemo - evolutionary stellar population model developed by ourselves in a previous paper ( vazdekis _ et al . we find that all of the iron lines are weaker than the best fitting models predict , indicating that the iron - abundance is anomalous and deficient . we also find ...
we present here the results of applying a new chemo - evolutionary stellar population model developed by ourselves in a previous paper ( vazdekis _ et al . _ 1996 ) to new high quality observational data of the nuclear regions of two representative elliptical galaxies and the bulge of the sombrero galaxy . here we fit ...
1102.0535
c
the wavelength region around 1 @xmath2 m is ideal for spectral classification of cttss : ( 1 ) the excess emission arising from the accretion process , which is very strong in the uv and optical wavelengths , is relatively small ; ( 2 ) the emission from the accretion disk itself , which can dominate the spectrum at k ...
we derive an excess spectrum ( above that of the m2.5v template ) that peaks in the h band . although our derived veiling values , , agree with previous estimates , the excess spectrum does not match that of current models in which this flux is generated by an inner optically thin disk . we suggest that the excess flux...
we present high signal - to - noise , moderate spectral resolution ( ) near - infrared ( m ) spectroscopy of the nearby t tauri star tw hya . by comparing the spectrum and the equivalent widths of several atomic and molecular features with those for stars in the irtf near - infrared library , we revise the spectral typ...
astro-ph9612079
r
when the interferometer is scanning the object , the monochromatic emission of this latter is modulated by the interference pattern while the continuum emission remains unaffected . this enables to distinguish line and continuum emission with a much higher contrast than with simple images obtained through interference ...
we present high spatial resolution observations of the blue compact dwarf galaxy izw18 performed in the h line with a scanning fabry - perot interferometer at the cfh telescope . morphological structure of the galaxy in h and in the red continuum is investigated . they have no clear h counterparts . the velocity field ...
we present high spatial resolution observations of the blue compact dwarf galaxy izw18 performed in the h line with a scanning fabry - perot interferometer at the cfh telescope . morphological structure of the galaxy in h and in the red continuum is investigated . we also analyse the velocity field of the ionized gas ....
astro-ph9612079
c
the main results of h@xmath0 scanning fabry - perot investigations of izw18 may be summarized as follows : + - in the main body of this galaxy , the _ current _ sites of active star formation , identified from the presence of prominent emission lines have ages of few 10@xmath70 years and are spatially separated from re...
we also analyse the velocity field of the ionized gas . besides the two compact hii components of the main body we find a population of small hii regions in its surroundings whose diameter distribution and h luminosity function are consistent with those observed in dwarf irregular galaxies . in the main body of the gal...
we present high spatial resolution observations of the blue compact dwarf galaxy izw18 performed in the h line with a scanning fabry - perot interferometer at the cfh telescope . morphological structure of the galaxy in h and in the red continuum is investigated . we also analyse the velocity field of the ionized gas ....
astro-ph0411026
c
in this paper we have presented detailed multicolor surface photometry performed with a ccd in the @xmath100 bands and a nicmos detector in the @xmath1 band , for a sample of 34 lenticular galaxies from the ugc catalogue . the galaxies were chosen in an unbiased fashion from a subset of ugc lenticulars as explained in ...
we present in this paper multicolor surface and aperture photometry in the and bands for a sample of 34 lenticular galaxies from the ugc catalogue . from surface photometric analysis we obtain total integrated magnitudes and colors and find that these are in good agreement with the values from the rc3 catalogue .
we present in this paper multicolor surface and aperture photometry in the and bands for a sample of 34 lenticular galaxies from the ugc catalogue . from surface photometric analysis , we obtain radial profiles of surface brightness , colors , ellipticity , position angle and the fourier coefficients which describe the...
1703.03526
i
high - redshift ( z @xmath4 5 ) quasars are important tracers to study the early universe . however , they are difficult to be found due to both low spatial density and high contaminants from cool dwarfs when using color selection . although more than 300,000 quasars are now known ( e.g. * ? ? ? * ; * ? ? ? * ; * ? ? ?...
we present initial results from the first systematic survey of luminous quasars . quasars at 5.5 , the post - reionization epoch , are crucial tools to explore the evolution of intergalactic medium , quasar evolution and the early super - massive black hole growth . however , it has been very challenging to select quas...
we present initial results from the first systematic survey of luminous quasars . quasars at 5.5 , the post - reionization epoch , are crucial tools to explore the evolution of intergalactic medium , quasar evolution and the early super - massive black hole growth . however , it has been very challenging to select quas...
0801.4578
i
mid - infrared spectroscopy is a useful tool in investigating the extent to which starbursts and agn contribute to the luminosity of luminous infrared galaxies ( lirgs ; @xcite ) . the infrared spectra of local lirgs have been studied extensively with isophot , isocam and sws on the @xmath9 @xmath10 @xmath11 ( iso ; e....
we present mid - infrared spectroscopy of a sample of 16 optically faint infrared luminous galaxies obtained with the infrared spectrograph ( irs ) on the . these sources were jointly selected from and imaging surveys in the ndwfs botes field and were selected from their bright x - ray fluxes to host luminous agn . non...
we present mid - infrared spectroscopy of a sample of 16 optically faint infrared luminous galaxies obtained with the infrared spectrograph ( irs ) on the . these sources were jointly selected from and imaging surveys in the ndwfs botes field and were selected from their bright x - ray fluxes to host luminous agn . non...
0801.4578
r
the irs spectra of all 16 x - ray selected sources are shown in figure [ fig : xspec ] . although the irs spectrum of houck13 was presented in @xcite , it satisfies the selection criteria of the main sample and we include it again here for completeness . 9/13 of the main sample ( and 9/16 of the total `` main + x - ra...
nine of the x - ray sources show 9.7 silicate absorption features . we argue that the featureless spectra likely result from the sources having weak or absent silicate and pah features rather than the sources lying at higher redshifts where these features are shifted out of the irs spectral window .
we present mid - infrared spectroscopy of a sample of 16 optically faint infrared luminous galaxies obtained with the infrared spectrograph ( irs ) on the . these sources were jointly selected from and imaging surveys in the ndwfs botes field and were selected from their bright x - ray fluxes to host luminous agn . non...
0801.4578
c
all the x - ray selected sources have infrared spectra consistent with their mid - ir luminosities being dominated by emission originating from agn activity . this is expected given that their high x - ray luminosities imply that they host luminous agn which should dominate their infrared spectra . we find a larger fra...
we investigate whether there are any correlations between x - ray and infrared properties and find that sources with silicate absorption features tend to have fainter x - ray fluxes and harder x - ray spectra , indicating a weak relation between the amount of silicate absorption and column density of x - ray - absorbin...
we present mid - infrared spectroscopy of a sample of 16 optically faint infrared luminous galaxies obtained with the infrared spectrograph ( irs ) on the . these sources were jointly selected from and imaging surveys in the ndwfs botes field and were selected from their bright x - ray fluxes to host luminous agn . non...
1410.8606
c
our primary finding is that the protoplanetary disk in hd 169142 possesses material that is within 1 au the star and undergoing changes to its structure on the order of a decade . a simple way to reduce the nir flux from observed pre-2000 levels to post-2000 levels is to reduce the scale height of the innermost edge of...
all observations known to us separate into two distinct states corresponding to a high near - ir state in the pre-2000 epoch and a low state in the post-2000 epoch , indicating activity within the au region of the disk . through analysis of the pa and br lines in our data we derive a mass accretion rate in may 2013 of ...
we present near - ir and far - uv observations of the pre - transitional ( gapped ) disk in hd 169142 using nasa s infrared telescope facility and hubble space telescope . the combination of our data along with existing data sets into the broadband spectral energy distribution reveals variability of up to 45% between.5...
1410.8606
i
our assembly of the broadband sed from data sets covering a quarter of a century reveals variability of up to 45% at nir wavelengths over a maximum timescale of 10 years . through modeling of the sed we confirm several scenarios where changes to the inner ( sub - au ) structures may reproduce the two distinct states of...
we present near - ir and far - uv observations of the pre - transitional ( gapped ) disk in hd 169142 using nasa s infrared telescope facility and hubble space telescope . the combination of our data along with existing data sets into the broadband spectral energy distribution reveals variability of up to 45% between.5...
we present near - ir and far - uv observations of the pre - transitional ( gapped ) disk in hd 169142 using nasa s infrared telescope facility and hubble space telescope . the combination of our data along with existing data sets into the broadband spectral energy distribution reveals variability of up to 45% between.5...
0912.0907
i
a recent flurry of new mission proposals has renewed interest in measuring x - ray polarization from a variety of astrophysical sources . the gravity and extreme magnetism smex ( _ gems _ ) mission , which has recently been approved for funding in the latest round of nasa small explorer proposals , should be able to de...
these seed photons are then inverse - compton scattered through a hot ( but thermal ) corona , producing a hard x - ray power - law spectrum . we consider three different models for the corona geometry : a wedge `` sandwich '' with aspect ratio and vertically - integrated optical depth constant throughout the disk ; an...
we present new calculations of x - ray polarization from accreting black holes ( bhs ) , using a monte - carlo ray - tracing code in full general relativity . in our model , an optically thick disk in the bh equatorial plane produces thermal seed photons with polarization oriented parallel to the disk surface . these s...
1309.2944
r
the reduced lightcurves are displayed in figure [ fig1 ] as a function of time for each of the five nights . immediately evident is the large decrease in brightness during the apparition that will be shown later to be simply due to the combination of increasing distance and increasing phase angle . gaps in the data on...
first , to determine its current rotation period and compare it to that measured shortly after its most recent perihelion passage in 2010 , and second , to disentangle the spin - down from synodic effects due to the solar day and the earth s orbital motion and to determine the sense of rotation , i.e. prograde or retro...
we present new lightcurve measurements of comet 10p / tempel 2 carried out with lowell observatory s discovery channel telescope in early 2013 when the comet was at aphelion . these data represent some of the first science obtained with this new 4.3-m facility . with tempel 2 having been observed to exhibit a small but...
1309.2944
c
the observations reported here represent some of the first science collected with lowell observatory s new discovery channel telescope . despite a few problems associated with a facility still in the early stages of commissioning , we were able to easily fulfill our major science objectives regarding comet tempel 2 s r...
we present new lightcurve measurements of comet 10p / tempel 2 carried out with lowell observatory s discovery channel telescope in early 2013 when the comet was at aphelion . these data represent some of the first science obtained with this new 4.3-m facility . with tempel 2 the nominal values imply that the rate of s...
we present new lightcurve measurements of comet 10p / tempel 2 carried out with lowell observatory s discovery channel telescope in early 2013 when the comet was at aphelion . these data represent some of the first science obtained with this new 4.3-m facility . with tempel 2 having been observed to exhibit a small but...
1505.06415
i
there has been growing interest recently , both experimentally @xcite and theoretically @xcite , in the processes @xmath0 and @xmath1 , the single inclusive production of a hadron or jet at large transverse momentum in lepton - nucleon scattering . in contrast to the far more customary process @xmath2 @xcite , for @x...
the main feature of these processes is that the scattered lepton is not observed , so that the hard scale that makes them perturbative is set by the transverse momentum of the hadron or jet . kinematically , the two processes thus become direct analogs of single - inclusive production in hadronic collisions which , as ...
we present next - to - leading order ( nlo ) perturbative - qcd calculations of the cross sections for and . the main feature of these processes is that the scattered lepton is not observed , so that the hard scale that makes them perturbative is set by the transverse momentum of the hadron or jet . kinematically , the...
0709.2915
c
the results from sextractor were used to map the ages of each region according to their azimuthal location in the ring . the right panels of figure 5 show the resolved regions , which are color - coded according to age , in terms of ew . we assigned the physical center of the ring ( as computed with ellipse ) to be ...
we use population synthesis models to estimate ages of each-emitting ( hii ) region , which range from 1 myr to 10 myrs throughout the rings . we find that approximately half of the rings contain azimuthal age gradients that encompass at least 25 of the ring , although there is no apparent relationship between the pres...
we present results from a photometric survey of 22 nuclear rings , aiming to provide insight into their star formation properties , including age distribution , dynamical timescales , star formation rates , and galactic bar influence . we find a clear relationship between the position angles and ellipticities of the r...
1503.08205
i
early _ chandra _ and _ xmm - newton _ x - ray observations revealed that the amount of gas cooling to very low temperatures at the centers of cool core clusters is much less than what is expected from simple radiative cooling models ( david et al . 2001 ; peterson et al . 2001 ; peterson & fabian 2006 ) . the implica...
we present results from a very deep ( 650 ks ) _ chandra _ x - ray observation of the galaxy group ngc 5813 , the deepest _ chandra _ observation of a galaxy group to date . this system is therefore unique in exhibiting three cavity pairs , each associated with an unambiguous shock front , arising from three distinct...
we present results from a very deep ( 650 ks ) _ chandra _ x - ray observation of the galaxy group ngc 5813 , the deepest _ chandra _ observation of a galaxy group to date . earlier observations showed two pairs of cavities distributed roughly collinearly , with each pair associated with an elliptical shock front . t...
1503.08205
c
shocks are expected to heat the icm as they propagate . while there is a relatively large temperature jump at the shock front , this increase is transient as the gas subsequently expands and cools . the relevant quantity for lasting heating of the gas is the change in entropy . the equivalent amount of heat energy @xma...
this heating takes place roughly isotropically and most strongly at small radii , as is required for feedback to operate . we suggest that shock heating may play a significant role in agn feedback at smaller radii in other systems , where weak shocks are more difficult to detect . we find non - zero shock front widths ...
we present results from a very deep ( 650 ks ) _ chandra _ x - ray observation of the galaxy group ngc 5813 , the deepest _ chandra _ observation of a galaxy group to date . earlier observations showed two pairs of cavities distributed roughly collinearly , with each pair associated with an elliptical shock front . t...
1503.08205
i
we have presented results from our analysis of a very deep _ chandra _ observation of the galaxy group n5813 . this observation confirms an outer cavity pair and associated shock ( only hinted at in r11 ) , giving a total of three pairs of roughly collinear cavities , with each pair associated with an elliptical shock ...
earlier observations showed two pairs of cavities distributed roughly collinearly , with each pair associated with an elliptical shock front . the new observations confirm a third pair of outer cavities , collinear with the other pairs , and reveal an associated outer outburst shock , with measured temperature jump , a...
we present results from a very deep ( 650 ks ) _ chandra _ x - ray observation of the galaxy group ngc 5813 , the deepest _ chandra _ observation of a galaxy group to date . earlier observations showed two pairs of cavities distributed roughly collinearly , with each pair associated with an elliptical shock front . t...
astro-ph0405003
i
the orion nebula is one of the best studied star formation regions in the galaxy . the orion nebula cluster ( onc ) designates the inner 3 pc ( @xmath0 20 arcmin ) from @xmath1c orionis , and contains more than three thousand stars . the core of the onc , also known as the trapezium cluster @xcite , comprises the stars...
we present results of chandra observations of two flanking fields ( ff ) in orion , outside the orion nebula cluster ( onc ) . the optical and infrared photometry for the stars identified as x - ray sources are consistent with most of these objects being pre - main sequence stars with ages younger than 10 myr .
we present results of chandra observations of two flanking fields ( ff ) in orion , outside the orion nebula cluster ( onc ) . the observations were taken with the acis - i camera with an exposure time of about 48 ks each field . we present a catalog of 417 sources , which includes x - ray luminosity , optical and infr...
astro-ph0405003
c
we present a catalog of orion x - ray sources from two flanking fields . the observations were taken with the acis - i on board the chandra x - ray observatory . the catalog , consisting of 417 sources , includes x - ray luminosity , optical and infrared photometry and x - ray variability information . we found 91 vari...
we present a catalog of 417 sources , which includes x - ray luminosity , optical and infrared photometry and x - ray variability information . we have found 91 variable sources , 33 of which have a flare - like light curve , and 11 of which have a pattern of a steady increase or decrease over a 10 hour period . we pre...
we present results of chandra observations of two flanking fields ( ff ) in orion , outside the orion nebula cluster ( onc ) . the observations were taken with the acis - i camera with an exposure time of about 48 ks each field . we present a catalog of 417 sources , which includes x - ray luminosity , optical and infr...
astro-ph0405187
c
we have presented the rest - frame optical spectra of a sample of uv - selected star - forming galaxies that are also bright in the rest - frame optical . the [ nii]/@xmath4 line ratios of the majority of these galaxies indicate that they have already been enriched to at least solar oxygen abundance at a lookback time ...
drawn from a large spectroscopic survey of galaxies photometrically pre - selected by their colors to lie at , these galaxies were chosen for their bright rest - frame optical luminosities ( ) . most strikingly , the majority of the sample of 7 galaxies exhibit [ nii]/ nebular emission line ratios indicative of at leas...
we present results of near - ir spectroscopic measurements of 7 star - forming galaxies at . drawn from a large spectroscopic survey of galaxies photometrically pre - selected by their colors to lie at , these galaxies were chosen for their bright rest - frame optical luminosities ( ) . most strikingly , the majority o...
1112.2641
i
to realize a quantum computer in the circuit model , it is crucial to have precise control over each of the carriers of quantum information . in addition to keeping the quantum state of the computer protected from unavoidable noise induced by the environment , it is necessary to implement suitable quantum gates , usual...
we present strictly efficient schemes for scalable measurement - based quantum computing using continuous - variable systems : these schemes are based on suitable non - gaussian resource states , ones that can be prepared using interactions of light with matter systems or even purely optically . merely gaussian measure...
we present strictly efficient schemes for scalable measurement - based quantum computing using continuous - variable systems : these schemes are based on suitable non - gaussian resource states , ones that can be prepared using interactions of light with matter systems or even purely optically . merely gaussian measure...
cond-mat0509599
i
the question of coexistence of singlet superconductivity and magnetism has been adressed for many years . it was found that the superconducting order parameter is destroyed by a magnetic field both via the orbital effect @xcite and the paramagnetic effect.@xcite in the usual case of an isotropic three - dimensional ( 3...
it is demonstrated that such systems exhibit a competition between the nonuniform larkin - ovchinnikov - fulde - ferrel ( fflo ) state and the superconducting state where the sign of the superconducting order parameter is opposite in adjacent layers . we determine the complete temperature - field phase diagram . in the...
we present the detailed theoretical study of a heterostructure comprising of two coupled ferromagnetic superconducting layers . our model may be also applicable to the layered superconductors with alternating interlayer coupling in a parallel magnetic field . it is demonstrated that such systems exhibit a competition b...
astro-ph0607514
i
after more than a decade of study , the fundamental parameters of brown dwarfs remain poorly constrained . unlike hydrogen - burning stars , whose effective temperatures and luminosities are approximately age - independent ( at a fixed mass and composition ) on the main sequence , brown dwarfs cool and dim continuously...
we present the discovery of a brown - dwarf companion to the 130400 myr - old g8 v star hd 203030 . the-band spectral type of l7.5.5 places hd 203030b near the critical l / t transition in brown dwarfs , which is characterized by the rapid disappearance of dust in sub - stellar photospheres . from a comparative ana...
we present the discovery of a brown - dwarf companion to the 130400 myr - old g8 v star hd 203030 . separated by 11 ( 487 au in projection ) from its host star , hd 203030b has an estimated mass of . the-band spectral type of l7.5.5 places hd 203030b near the critical l / t transition in brown dwarfs , which is c...
0903.4911
i
unravelling the physics of how gas - rich disk galaxies , recently arrived in galaxy clusters , are transformed into the quiescent elliptical and s0 populations that dominate dense cluster cores at @xmath14 is one of the longest - standing unsolved problems in astrophysics . numerous studies of massive early - type gal...
we present the first galaxy evolution results from the local cluster substructure survey ( locuss ) , a multi - wavelength survey of 100 x - ray selected galaxy clusters at . locuss combines far - uv through far - ir observations of cluster galaxies with gravitational lensing analysis and x - ray data to investigate th...
we present the first galaxy evolution results from the local cluster substructure survey ( locuss ) , a multi - wavelength survey of 100 x - ray selected galaxy clusters at . locuss combines far - uv through far - ir observations of cluster galaxies with gravitational lensing analysis and x - ray data to investigate th...
0903.4911
c
@xcite and @xcite have studied a1758 in detail as a merging cluster using weak lensing and x - ray data respectively . in particular @xcite investigated the thermodynamics of both cluster components . here we compare our results on obscured star - formation in a1758 with the thermodynamics of the intracluster medium , ...
the obscured galaxies faithfully trace the cluster potential as revealed by the weak - lensing mass map of the cluster , including numerous mass peaks atmpcthat are likely associated with infalling galaxy groups and filamentary structures . the 24 results from a1758 therefore suggest that dust - obscured cluster galaxi...
we present the first galaxy evolution results from the local cluster substructure survey ( locuss ) , a multi - wavelength survey of 100 x - ray selected galaxy clusters at . locuss combines far - uv through far - ir observations of cluster galaxies with gravitational lensing analysis and x - ray data to investigate th...
0903.4911
c
we have presented the first results from our panoramic multi - wavelength survey of 31 clusters at @xmath207 clusters as part of the local cluster substructure survey ( locuss ; pi : g. p.smith ) . for this initial study we chose a1758 , an actively merging cluster at @xmath152 that has been previously studied with hi...
the obscured activity in a1758 is therefore comparable with that in cl0024 , the most active cluster previously studied at . however the core ( ) of a1758n is more active in the infrared than that of a1758s , likely reflecting differences in the recent dynamical history of the two clusters .
we present the first galaxy evolution results from the local cluster substructure survey ( locuss ) , a multi - wavelength survey of 100 x - ray selected galaxy clusters at . locuss combines far - uv through far - ir observations of cluster galaxies with gravitational lensing analysis and x - ray data to investigate th...
0910.5666
i
compared to known superbubbles and hii regions ic131-se appears to be peculiar with respect to its lopsided x - ray morphology , the large linear extent of the x - ray emission , the lack of massive o stars , its high electron temperature ( in case the x - ray gas is thermal ) , and large fraction of hard x - rays . t...
known hii regions ic131-se seems to be extreme regarding the combination of its large extent of the x - ray plasma , the lack of massive o stars , its unusually high electron temperature ( if thermal ) , and the large fraction of emitted above 2kev (% ) . if the gas is non - thermal or has non - thermal contributions ...
we present the first x - ray analysis of the diffuse hot ionized gas and the point sources in ic131 , after ngc604 the second most x - ray luminous giant hii region in m33 . the x - ray emission is detected only in the south eastern part of ic131 ( named ic131-se ) and is limited to an elliptical region of pc in exten...
1312.4526
i
galaxy clusters are the largest and youngest gravitationally - bound cosmic structure and form hierarchically through collisions and mergers of smaller systems . spatial and radial velocity distributions of member galaxies and x - ray observations of the intracluster medium ( icm ) have revealed that some systems are s...
we present the results from _ suzaku _ observations of the perseus galaxy cluster , which is relatively close , the brightest in the x - ray sky and a relaxed object with a cool core . a number of exposures of central regions and offset pointing with the x - ray imaging spectrometer cover a region within radii of . th...
we present the results from _ suzaku _ observations of the perseus galaxy cluster , which is relatively close , the brightest in the x - ray sky and a relaxed object with a cool core . a number of exposures of central regions and offset pointing with the x - ray imaging spectrometer cover a region within radii of . th...
astro-ph9907371
r
in table [ coords ] we list new hh objects identified by our narrow band ccd imaging of candidates identified from the orion plate . several of the new objects were identified by reipurth ( 1985 ) as candidate hh objects from his eso r film survey of the orion region . objects independently discovered by the ccd imagi...
we present the results of a photographic and ccd imaging survey for herbig haro ( hh ) objects in the l1630 and l1641 giant molecular clouds in orion . the new hh flows were initially identified from a deep film from the recently commissioned aao / ukst survey of the southern sky . our ccd , , continuum and i band i...
we present the results of a photographic and ccd imaging survey for herbig haro ( hh ) objects in the l1630 and l1641 giant molecular clouds in orion . the new hh flows were initially identified from a deep film from the recently commissioned aao / ukst survey of the southern sky . our scanned and broad band r imag...
astro-ph9907371
c
by use of a single aao / ukst film of the orion region , we have identified emission line nebulosities which resemble bow shocks , jets and extensive alignments of arc shaped nebulae indicating possible giant molecular flows . subsequent narrow and broad band ccd imaging has confirmed these features as genuine hh ob...
our scanned and broad band r images highlight both the improved resolution of the survey and the excellent contrast of the flux with respect to the broad band r. comparative ivn survey images allow us to distinguish between emission and reflection nebulosity . our results indicate that for declinations south of -6 in...
we present the results of a photographic and ccd imaging survey for herbig haro ( hh ) objects in the l1630 and l1641 giant molecular clouds in orion . the new hh flows were initially identified from a deep film from the recently commissioned aao / ukst survey of the southern sky . our scanned and broad band r imag...
0805.1335
c
in this paper we have reported the results of a study of a large sample of luminous ( @xmath2 ) lbgs in the redshift interval @xmath1 . by employing a photometric redshift analysis of the available optical+nearir data we have derived improved estimates of the bright end of the uv - selected luminosity function at @xmat...
we present the results of a study of a large sample of luminous ( ) lyman break galaxies ( lbgs ) in the redshift interval , selected from a contiguous 0.63 square degree area covered by the ukidss ultra deep survey ( uds ) and the subaru xmm - newton survey ( sxds ) . utilising the large area coverage and the excellen...
we present the results of a study of a large sample of luminous ( ) lyman break galaxies ( lbgs ) in the redshift interval , selected from a contiguous 0.63 square degree area covered by the ukidss ultra deep survey ( uds ) and the subaru xmm - newton survey ( sxds ) . utilising the large area coverage and the excellen...
astro-ph0602091
i
cyg x-1 is one of the brightest high - energy sources in the sky , with an average 1 - 200 kev energy flux of @xmath4 ergs @xmath5s@xmath6 . its optical companion is an o9.7 iab supergiant hde 226868 . estimates of the mass , m , of the x - ray star , @xmath7 [ e.g. , @xcite ] strongly suggest the presence of a black h...
we present timing and spectral analysis of 2.2 ms of rossi x - ray time explorer ( _ rxte _ ) archival data from cyg x-1 . using a generic comptonization model we find a strong correlation between the 0.1 - 20 hz frequencies of quasiperiodic oscillations ( qpos ) and the spectral index . presence of two spectral phases...
we present timing and spectral analysis of 2.2 ms of rossi x - ray time explorer ( _ rxte _ ) archival data from cyg x-1 . using a generic comptonization model we reveal that the spectrum of cyg x-1 consists of three components : a thermal seed photon spectrum , a comptonized part of the seed photon spectrum and the ir...
astro-ph0602091
r
the evolution of spectral properties of the source during the transition from the low / hard to the soft states is shown on figure [ spevol ] and in table [ statestab ] . the temperature profile of the thermal ( blackbody ) component is plotted versus the index @xmath10 in figure [ kt ] . this temperature is presumably...
we reveal that the spectrum of cyg x-1 consists of three components : a thermal seed photon spectrum , a comptonized part of the seed photon spectrum and the iron line . the saturation level of is the lowest value found yet in bhcs . the bolometric luminosity does not show clear correlation with the index . the ew incr...
we present timing and spectral analysis of 2.2 ms of rossi x - ray time explorer ( _ rxte _ ) archival data from cyg x-1 . using a generic comptonization model we reveal that the spectrum of cyg x-1 consists of three components : a thermal seed photon spectrum , a comptonized part of the seed photon spectrum and the ir...
1509.03322
i
compton - thick agn ( ctagn ) are expected to constitute a significant fraction of the overall agn population in the local universe , accounting for @xmath02030@xmath10 of agn according to multiwavelength studies ( e.g. @xcite ; @xcite ; @xcite ) . many studies also predict that ctagn provide a substantial contribution...
we present two _ nustar _ observations of the local seyfert 2 active galactic nucleus ( agn ) and an ultraluminous x - ray source ( ulx ) candidate in ngc 5643 . together with archival data from however , the lack of high - quality 10 kev observations , together with the presence of a nearby x - ray luminous source , n...
we present two _ nustar _ observations of the local seyfert 2 active galactic nucleus ( agn ) and an ultraluminous x - ray source ( ulx ) candidate in ngc 5643 . together with archival data from _ chandra _ , _ xmm - newton _ and _ swift_-bat , we perform a high - quality broadband spectral analysis of the agn over two...
1509.03322
i
we observed the agn and ulx candidate in ngc 5643 using _ nustar _ on two occasions conducted at about a month separation . a summary of our main results is as follows : 1 . using the combined data from _ nustar _ , _ chandra _ , _ xmm - newton _ and _ swift_-bat , we have extended the broadband spectral analysis ...
_ chandra _ , _ xmm - newton _ and _ swift_-bat , we perform a high - quality broadband spectral analysis of the agn over two decades in energy (.5100 kev ) . the new data show that the nucleus is indeed obscured by a ct column of 5 10 . the range of 210 kev absorption - corrected luminosity inferred from the best fitt...
we present two _ nustar _ observations of the local seyfert 2 active galactic nucleus ( agn ) and an ultraluminous x - ray source ( ulx ) candidate in ngc 5643 . together with archival data from _ chandra _ , _ xmm - newton _ and _ swift_-bat , we perform a high - quality broadband spectral analysis of the agn over two...
1205.4717
i
the modelling of the spectral energy distribution ( sed ) of galaxies and its interpretation in terms of stellar population parameters ( e.g. age , star formation history , metallicity ) via stellar population synthesis ( sps ) is a fundamental tool to understand the properties and evolution of galaxies . yet , we are ...
, we explore the parameter space over which the relative energy output of tp - agb stars peaks . our main results are : _ the optical - nir seds of most of our post - starburst galaxies can be consistently reproduced with bruzual & charlot ( 2003 ) models , using either simple stellar populations ( ssp ) of correspondi...
we present vlt - isaac near infrared ( nir ) spectro - photometric observations of 16 post - starburst galaxies aimed at constraining the debated influence of tp - agb stars on the spectral energy distribution ( sed ) of galaxies with stellar ages between 0.5 and 2 gyr , hence critical for high - redshift studies . pos...
1205.4717
i
we have presented the first spectroscopic study of post - starburst galaxies covering both the optical ( sdss ) and nir ( our new vlt - isaac observations ) wavelength ranges , which was specifically designed to detect the two main signatures of the presence of tp - agb stars predicted by the @xcite models in contrast ...
we present vlt - isaac near infrared ( nir ) spectro - photometric observations of 16 post - starburst galaxies aimed at constraining the debated influence of tp - agb stars on the spectral energy distribution ( sed ) of galaxies with stellar ages between 0.5 and 2 gyr , hence critical for high - redshift studies . pos...
we present vlt - isaac near infrared ( nir ) spectro - photometric observations of 16 post - starburst galaxies aimed at constraining the debated influence of tp - agb stars on the spectral energy distribution ( sed ) of galaxies with stellar ages between 0.5 and 2 gyr , hence critical for high - redshift studies . pos...
1301.2323
r
figure [ fig9_cont ] maps the spatial distributions of gc candidates ( left panel ) and foreground / background objects ( right ) . the color - filled contours show the distribution of surface number density . the black crosses mark the positions of the optical centers of galaxies ( from top , ngc 1399 , ngc 1387 , ng...
the main results based on some 2000 gc candidates around ngc 1399 , ngc 1404 , and ngc 1387 are as follows : ( 1 ) the gc system in each galaxy exhibits bimodal color distributions in all colors examined , but the shape of color histograms varies systematically depending on colors ; ( 2 ) ngc 1399 shows that the mean c...
we present wide - field multiband photometry of globular cluster ( gc ) systems in ngc 1399 , ngc 1404 , and ngc 1387 located at the central region of the fornax galaxy cluster . observation was carried out through , , , and bands , which marks one of the widest and deepest-band studies on extragalactic gc systems . th...
1301.2323
i
we have performed wide - field @xmath30 photometry of gcs in the central region of the fornax cluster of galaxies with the mosaic ii ccd imager on the 4 m blanco telescope at ctio . this is one of the widest and deepest @xmath0-band studies on extragalactic gc systems . the reduction was carried out with the daophot ii...
we present wide - field multiband photometry of globular cluster ( gc ) systems in ngc 1399 , ngc 1404 , and ngc 1387 located at the central region of the fornax galaxy cluster . the present-band photometry enables us to significantly reduce the contamination by a factor of two for faint sources (.5 ) .
we present wide - field multiband photometry of globular cluster ( gc ) systems in ngc 1399 , ngc 1404 , and ngc 1387 located at the central region of the fornax galaxy cluster . observation was carried out through , , , and bands , which marks one of the widest and deepest-band studies on extragalactic gc systems . th...
hep-th0207057
i
we address the question of how the dynamics of quantum systems on curved space times can be described in a physically motivated and mathematically useful manner in the special case of a class of robertson walker space times . in the literature known to us , the general question is broached either for free fields or ...
we propose a canonical description of the dynamics of quantum systems on a class of robertson walker space times . we show that the worldline of an observer in such space times walker space that there exist quantum systems on robertson the transplanted state is locally passive , in an appropriate sense , with respe...
we propose a canonical description of the dynamics of quantum systems on a class of robertson walker space times . we show that the worldline of an observer in such space times determines a unique orbit in the local conformal group of the space time and that this orbit determines a unique transport on the space ti...