id large_stringlengths 9 16 | title large_stringlengths 1 382 | abstract large_stringlengths 3 6.09k | publish_date date32 | update_date date32 | categories large listlengths 1 13 | authors large_stringlengths 3 62.8k |
|---|---|---|---|---|---|---|
astro-ph/9511126 | H_2 Cooling of Primordial Gas Triggered by UV Irradiation | We investigate the formation of molecular hydrogen (H_2) in a primordial H+He
gas cloud irradiated by a power-law UV flux. We find that at high densities (>1
cm^{-3}) and low temperatures (<10^4 K), the background radiation enhances the
formation of H_2 and results in molecular cooling dominating over
photoionization h... | 1995-11-27 | 2009-10-28 | [
"astro-ph"
] | Zoltan Haiman, Martin Rees, and Abraham Loeb |
astro-ph/9511125 | The behaviour of the excess CaII H & K and H_epsilon emissions in
chromospherically active binaries | In this work we analyze the behaviour of the excess Ca~{\sc ii} H \& K and
H$\epsilon$ emissions in a sample of 73 chromospherically active binary systems
(RS$~$CVn and BY$~$Dra classes), of different activity levels and luminosity
classes. This sample includes the 53 stars analyzed by Fern\'andez-Figueroa et
al. (1994... | 1995-11-27 | 2016-08-30 | [
"astro-ph"
] | D. Montes, M.J. Fernandez-Figueroa, M. Cornide, E. De Castro |
astro-ph/9511128 | An HI survey of the Bootes Void. II. The Analysis | We discuss the results of a VLA HI survey of the Bootes void and compare the
distribution and HI properties of the void galaxies to those of galaxies found
in a survey of regions of mean cosmic density. The Bootes survey covers 1100
Mpc$^{3}$, or $\sim$ 1\% of the volume of the void and consists of 24 cubes of
typicall... | 1995-11-27 | 2009-10-28 | [
"astro-ph"
] | A. Szomoru (Kapteyn Astronomical Institute) J.H. van Gorkom (Columbia
University) M.D. Gregg (Lawrence Livermore National Laboratory) M.A. Strauss
(Institute for Advanced Study, Princeton) |
astro-ph/9511123 | The Contribution of Late-type/Irregulars to the Faint Galaxy Counts from
HST Medium Deep Survey Images | We present a complete morphologically classified sample of 144 faint field
galaxies from the HST Medium Deep Survey with 20.0 < I <22.0 mag. We compare
the global properties of the ellipticals, early and late-type spirals, and find
a non-negligible fraction (13/144) of compact blue [(V-I) < 1.0 mag] systems
with $r^{1/... | 1995-11-27 | 2016-08-30 | [
"astro-ph"
] | Simon P. Driver (ASU), Rogier A. Windhorst (ASU), Richard E. Griffiths
(JHU) |
astro-ph/9511130 | Concepts in CMB Anisotropy Formation | These lecture notes form a primer on the theory of cosmic microwave
background (CMB) anisotropy formation. With emphasis on conceptual aspects
rather than technical issues, we examine the physical foundations of anisotropy
evolution in relativistic kinetic and perturbation theory as well as the
manifestation of these p... | 1995-11-27 | 2015-06-24 | [
"astro-ph"
] | Wayne Hu (IAS) |
astro-ph/9511127 | An HI survey of the Bootes Void. I. The Data | We present the results of a neutral hydrogen survey of the Bootes void
carried out with the VLA in D-array. The survey covers $\sim 1100$ Mpc$^{3}$,
about 1\% of the volume of the void as defined by Kirshner \etal 1987. We
observed 24 fields, centered on known void galaxies; 16 of these were detected
in HI. Eighteen un... | 1995-11-27 | 2009-10-28 | [
"astro-ph"
] | A. Szomoru (Kapteyn Astronomical Institute) J.H. van Gorkom (Columbia
University) M.D. Gregg (Lawrence Livermore National Laboratory) |
astro-ph/9511129 | The rate of supernovae: biases and uncertainties | Using an updated SN list and galaxy parameters from the RC3 catalog, we have
revisited two well know biases affecting SN searches. We show that the bias in
the central region of galaxies is negligible for galaxies closer than 40 Mpc
(H=75), but causes the loss of almost 50% of SNe in the distance range 80-160
Mpc. This... | 1995-11-27 | 2007-05-23 | [
"astro-ph"
] | Enrico Cappellaro and Massimo Turatto |
astro-ph/9511124 | Statistics of Small-N Simulations | We first review the reasons for carrying out statistical analysis of results
from large numbers of N-body simulations, including a summary of previous work.
Then we describe some results about the behaviour of N-body systems which have
been acquired by this technique. Finally we concentrate on the problems
associated w... | 1995-11-27 | 2007-05-23 | [
"astro-ph"
] | Douglas C. Heggie |
astro-ph/9511118 | Hydrogen Masers. I: Theory and Prospects | The discovery of the first naturally occurring high gain hydrogen
recombination line (HRL) maser, in the millimeter and submillimeter spectrum of
the emission line star MWC349, requires an expansion of current paradigms about
HRLs. In this paper we re-examine in general the physics of non-LTE populations
in recombining... | 1995-11-26 | 2012-08-27 | [
"astro-ph"
] | Vladimir S. Strelnitski, Victor O. Ponomarev, Howard A. Smith |
astro-ph/9511119 | Hydrogen Masers. II: MWC349 | The conditions of masing and lasing in the hydrogen recombination lines (HLR)
in the disk and outflow of MWC349 are studied. Comparison of the complete set
of the observed aphal-lines, with simple models of optically thin spontaneous
emission shows that observable HRL masing in this source is limited to the
interval of... | 1995-11-26 | 2009-10-28 | [
"astro-ph"
] | Vladimir S. Strelnitski, Howard A. Smith, Victor O. Ponomarev |
astro-ph/9511121 | Minimum relaxation n-body simulations using orthogonal series force
computation | This report describes a modification of the orthogonal function Poisson
solver for n-body simulations that minimizes relaxation caused by small
particle number fluctuations. With the standard algorithm, the noise leading to
relaxation can be reduced by making the expansion basis similar to the particle
distribution and... | 1995-11-26 | 2016-08-30 | [
"astro-ph"
] | Martin D. Weinberg |
astro-ph/9511122 | The Dynamics of the Galactic Bar | I selectively review the various dynamical scenarios that have been explored
to date, especially those that illustrate the conundrums. In short, although
the existence of asymmetries are convincing enough, the interpretation remains
ambiguous. A coherent picture for the Milky Way asymmetries is an obvious lack;
each me... | 1995-11-26 | 2007-05-23 | [
"astro-ph"
] | Martin D. Weinberg |
astro-ph/9511120 | Gravitational collisions in cosmological N-body codes | We study the accumulation of errors in cosmological N-body algorithms that
are caused by representing the continuous distribution of matter by massive
particles, comparing the PPPM and Adaptive Multigrid codes. We use for this a
new measure of two-body relaxation suitable for nonstationary gravitating
systems. This mea... | 1995-11-26 | 2007-05-23 | [
"astro-ph"
] | Ivar Suisalu (1,2,3) and Enn Saar (1,3) ((1) Tartu Observatory, (2)
Royal Observatory Edinburgh, (3) Theoretical Astrophysics Center, Copenhagen) |
astro-ph/9511117 | Are Gamma Ray Bursts due to Rotation Powered High Velocity Pulsars in
the Halo ? | The BATSE experiment has now observed more than 1100 gamma-ray bursts. The
observed angular distribution is isotropic, while the brightness distribution
of bursts shows a reduced number of faint events. These observations favor a
cosmological burst origin. Alternatively, very extended Galactic Halo (EGH)
models have be... | 1995-11-25 | 2009-10-28 | [
"astro-ph"
] | Dieter Hartmann & Ramesh Narayan |
astro-ph/9511115 | Dark Matter in Globular Clusters | We first review reasons why dark matter is an interesting issue in connection
with star clusters. Next we consider to what extent the presence of dark matter
is consistent with their dynamics and structure. We review various
model-dependent and model-independent methods which have been applied to two
well studied clust... | 1995-11-24 | 2007-05-23 | [
"astro-ph"
] | Douglas C. Heggie and Piet Hut |
astro-ph/9511116 | Adaptative Smooth Particle Hydrodynamics and Particle-Particle coupled
codes: Energy and Entropy Conservation | We present and test a general-purpose code, called PPASPH, for evolving
self-gravitating fluids in astrophysics, both with and without a collisionless
component. In PPASPH, hydrodynamical properties are computed by using the SPH
(Smoothed Particle Hydrodynamics) method while, unlike most previous
implementations of SPH... | 1995-11-24 | 2009-10-28 | [
"astro-ph"
] | Arturo Serna, Jean-Michel Alimi (LAEC, Observatoire de Meudon, France)
& Jean-Pierre Chieze (PTN, CEA, Bruyeres le Chatel, France) |
astro-ph/9511113 | Ca depletion and the presence of dust in large scale nebulosities in
radiogalaxies (I) | We show that the study of the Calcium depletion is a valid an highly
sensitive method for investigating the chemical and physical history of the
very extended ionized nebulae seen around radio galaxies (EELR), massive
ellipticals and `cooling flow' galaxies. By observing the near IR spectrum of
nebular regions characte... | 1995-11-24 | 2007-05-23 | [
"astro-ph"
] | M. Villar-Martin and L. Binette |
astro-ph/9511114 | Modeling the Lightcurves of Type Ia Supernovae | In order to investigate non-uniformity in the luminosity evolution of Type Ia
supernovae, we fit the lightcurves with a multi-parameter empirical model. The
model provides a quantitative method of analyzing the lightcurves of Type I
supernovae and a convenient and continuous representation of the photometric
data. Usin... | 1995-11-24 | 2007-05-23 | [
"astro-ph"
] | W. D. Vacca and B. Leibundgut |
astro-ph/9511112 | A symplectic approach to gravitational instability | We present a global approach of non-dissipative physics. Based on symplectic
mechanics this technique allows us to obtain the solution of a very large class
of problems in terms of a Taylor expand. We apply this method to the problem of
gravitational instability and we obtain a general expression of the
gravitational p... | 1995-11-24 | 2009-10-28 | [
"astro-ph"
] | J. Perez (SAP, CEA Saclay), M. Lachieze-Rey (SAP, CEA Saclay) |
astro-ph/9511111 | Concordance of X-Ray Cluster Data With BBN In Mixed Dark Matter Models | If the hot, X-ray emitting gas in rich clusters forms a fair sample of the
universe (as in Cold Dark Matter (CDM) models), and the universe is at the
critical density, $\Omega_T = 1$, then the data appears to imply a baryon
fraction, $\Omega_{b,x}$ ($\Omega_{b,x}\equiv \Omega_b$ derived from X-ray
cluster data), larger... | 1995-11-24 | 2009-10-28 | [
"astro-ph"
] | Russell W. Strickland, David N. Schramm |
astro-ph/9511110 | Modelling the Deep Counts: Luminosity Evolution, Dust and Faint Galaxies | In this paper we analyse the deep number counts problem, taking account of
new observational and theoretical developments. First we show that the new
Bruzual and Charlot (1993) models allow a new class of spiral dominated
luminosity evolution (LE) model where significant amounts of the luminosity
evolution needed to fi... | 1995-11-23 | 2015-06-24 | [
"astro-ph"
] | Ana Campos and Tom Shanks (Dept. Physics, U. Durham) |
astro-ph/9511106 | Pulsar Recoil and Gravitational Radiation due to Asymmetrical Stellar
Collapse and Explosion | New data imply that the average velocity of radio pulsars is large
\cite{hla93}. Under the assumption that these data imply that a pulsar is born
with an ``intrinsic'' kick, we investigate whether such kicks can be a
consequence of asymmetrical stellar collapse and explosion. We calculate the
gravitational wave (GW) si... | 1995-11-23 | 2009-01-23 | [
"astro-ph"
] | Adam Burrows and John Hayes (University of Arizona) |
astro-ph/9511109 | Giant Planets at Small Orbital Distances | Using Doppler spectroscopy to detect the reflex motion of the nearby star, 51
Pegasi, Mayor \& Queloz (1995) claim to have discovered a giant planet in a
0.05-A.U., 4.23-day orbit. They estimate its mass to be in the range 0.5 \mj to
2 \mj, but are not able to determine its nature or origin. Including the
effects of th... | 1995-11-23 | 2010-04-06 | [
"astro-ph"
] | T. Guillot, A. Burrows, W.B. Hubbard, J.I. Lunine, and D. Saumon |
astro-ph/9511108 | The Effects of Inhomogeneities on Evaluating the Deceleration Parameter
q$_0$ | Analytic expressions for distance-redshift relations which have been
corrected for the effects of some inhomogeneities in the
Friedmann-Robertson-Walker (FRW) mass density are used to illustrate the
significance of inhomogeneities on a determination of $q_0$ made by using Type
Ia supernovae. The value of $q_0$ inferred... | 1995-11-22 | 2009-10-28 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | R. Kantowski, T. Vaughan, and D. Branch |
astro-ph/9511103 | Stability of spherical stellar systems I : Analytical results | The so-called ``symplectic method'' is used for studying the linear stability
of a self-gravitating collisionless stellar system, in which the particles are
also submitted to an external potential. The system is steady and spherically
symmetric, and its distribution function $f_0$ thus depends only on the energy
$E$ an... | 1995-11-22 | 2015-06-24 | [
"astro-ph"
] | J. Perez (SAP, CEA Saclay), J-J Aly (SAP, CEA Saclay) |
astro-ph/9511107 | Solar Core Homology, Solar Neutrinos and Helioseismology | Precise numerical standard solar models (SSMs) now agree with one another and
with helioseismological observations in the convective and outer radiative
zones. Nevertheless these models obscure how luminosity, neutrino production
and g-mode core helioseismology depend on such inputs as opacity and nuclear
cross section... | 1995-11-22 | 2009-10-28 | [
"astro-ph",
"hep-ph"
] | Sidney A. Bludman, Dallas C. Kennedy |
astro-ph/9511102 | Crisis in Cosmology : Observational Constraints on Omega and H_0 | Thanks to new technology of observations and fresh inputs from particle
physics, cosmology has advanced on both observational and theoretical fronts.
It is therefore opportune that we take stock of the cosmological situation
today and examine the observational and theoretical constraints as they are
now. The bottom lin... | 1995-11-22 | 2016-08-30 | [
"astro-ph"
] | J.S.Bagla, T.Padmanabhan and J.V.Narlikar |
astro-ph/9511104 | Galaxies with the DENIS 2 Micron Survey: A Preliminary Report | The DENIS $IJK$ survey of the entire southern sky is beginning observations
this year. It will return one million images, representing 4 Terabytes, among
which nearly $10^8$ stars and up to one million galaxies. The main
extragalactic applications of such a multi-band, digital, near-IR 2D survey are
listed, and the imp... | 1995-11-22 | 2019-07-31 | [
"astro-ph"
] | Gary A. Mamon (Institut d'Astrophysique de Paris) |
astro-ph/9511105 | Metal Enhancements in the X-ray Gas around Central Cluster Galaxies | The X-ray emission by hot gas around the central galaxies of galaxy clusters
is commonly modeled assuming the existence of steady-state, multiphase cooling
flows. The inflowing gas will be chemically enriched by type Ia supernovae and
stellar mass loss occurring in the outer parts of the central galaxy. This may
give r... | 1995-11-22 | 2007-05-23 | [
"astro-ph"
] | Andreas Reisenegger (Institute for Advanced Study) |
astro-ph/9511096 | Constrained realizations and minimum variance reconstruction of
non-Gaussian random fields | With appropriate modifications, the Hoffman--Ribak algorithm that constructs
constrained realizations of Gaussian random fields having the correct ensemble
properties can also be used to construct constrained realizations of those
non-Gaussian random fields that are obtained by transformations of an
underlying Gaussian... | 1995-11-21 | 2015-06-24 | [
"astro-ph"
] | Ravi K. Sheth (U.C. Berkeley) |
astro-ph/9511101 | The Dynamics of Groups and Clusters of Galaxies and Links to Cosmology | The links between the internal structure of galaxy groups and clusters and
cosmological parameters are reviewed here. The mass density profiles of
clusters, inferred from both optical analyses of the galaxy surface number
density profile coupled with internal kinematics, and from weak gravitational
lensing, appear cusp... | 1995-11-21 | 2008-02-03 | [
"astro-ph"
] | Gary A. Mamon (Institut d'Astrophysique de Paris) |
astro-ph/9511098 | The Colours of HII Galaxies | We present high spatial resolution CCD surface photometry study in the
optical V, R and I filters of 15 HII galaxies from the Nordic Optical Telescope
and the Jacobus Kapteyn Telescope at Canary Islands. The colours of the
starburst continuum and of the underlying galaxy are measured. The distribution
of colours of the... | 1995-11-21 | 2007-05-23 | [
"astro-ph"
] | Eduardo Telles and Roberto Terlevich |
astro-ph/9511100 | An Upper Mass Bound of a Two-Component Protogalaxy | We investigate the physical properties of a two-component virialized
protogalaxy comprising a hot gas and cold clouds which are in pressure
equilibrium under the assumptions that the protogalaxy is both spherical and
homogeneous. Two conditions which we adopt are that the protogalaxy is in
virial equilibrium and that t... | 1995-11-21 | 2016-08-30 | [
"astro-ph"
] | Keiko Miyahata and Satoru Ikeuchi(Osaka University) |
astro-ph/9511097 | Dynamical History of Ly \alpha clouds | The clustering properties of Ly ${\alpha}$ lines are analysed using an
intermediate resolution ($\sim 1\AA$) spectra of 67 QSOs compiled from the
literature. The pair velocity correlation function indicates a weak excess in
the velocity intervals up to ${\rm \Delta v\;=\;600\; km\;s^{-1}}$. The
z-integrated probability... | 1995-11-21 | 2009-10-28 | [
"astro-ph"
] | R. Srianand |
astro-ph/9511099 | A first look at galaxies with the DENIS survey | We review the various steps for the extraction of extended sources,
principally galaxies, from the DENIS images. The capabilities of DENIS are
studied with simulated images. A few real DENIS J and K_s-band images are
presented for very bright galaxies and one nearby rich galaxy cluster. | 1995-11-21 | 2007-05-23 | [
"astro-ph"
] | Gary Mamon (IAP), Vincent Banchet (IAP), Catherine Boisson (DAEC, Obs.
de Paris), Veronique Cayatte (DAEC, Obs. de Paris), and Frederic Engelmann
(IAP) |
astro-ph/9511094 | New Photometry of the Hyades $\delta$ Scuti star V777 Tau (71 Tau) | 71 Tau was discovered to be a $\delta$ Scuti star by Horan (1979, AJ 84,
1770). To our knowledge no other photometry of this star has been published. 71
Tau is the second brightest X-ray source in the Hyades and has been shown to be
variable by as much as 30 \% at ultraviolet wavelengths near 1700 to 2000 \AA.
We find ... | 1995-11-21 | 2007-05-23 | [
"astro-ph"
] | Kevin Krisciunas, Theodore Simon, Richard A. Crowe, Mavourneen Roberts |
astro-ph/9511095 | Infall Collapse Solutions in the Inner Limit: Radiation Pressure and its
Effects on Star Formation | In this paper, we study infall collapse solutions for star formation in the
small radius limit where the particle orbits become nearly pressure-free. We
generalize previous solutions to simultaneously include the effects of both
radiation pressure and angular momentum. The effects of radiation pressure can
be modeled u... | 1995-11-20 | 2008-11-26 | [
"astro-ph"
] | Jasmin Jijina, Fred C. Adams |
astro-ph/9511093 | Post-Newtonian Cosmological Dynamics in Lagrangian coordinates | The non-linear dynamics of irrotational dust in General Relativity is studied
in synchronous and comoving coordinates. All the equations are written in terms
of the metric tensor of spatial sections orthogonal to the flow, which allows
an unambiguous expansion in powers of $1/c^2$. To lowest order, the Newtonian
approx... | 1995-11-20 | 2015-06-24 | [
"astro-ph",
"gr-qc"
] | Sabino Matarrese, David Terranova |
astro-ph/9511089 | ASCA and ROSAT observations of the QSF3 field: the X-ray background in
the 0.1--7 keV band | The X-ray background (XRB) from 0.1 to 7 keV has been studied using high
spectral and spatial resolution data from the ASCA SIS and ROSAT PSPC.
Analysing both the diffuse background radiation and resolved sources, we have
carried out a series of joint spectral fits of the ASCA and ROSAT data. The
spectrum of the XRB ca... | 1995-11-20 | 2008-02-03 | [
"astro-ph"
] | L.-W. Chen, A. C. Fabian and K. C. Gendreau |
astro-ph/9511091 | The Ionization Fraction in Dense Clouds | We present submillimeter observations of various molecular ions toward two
dense clouds, NGC 2264 IRS1 and W 3 IRS5, in order to investigate their
ionization fraction. Analysis of the line intensity ratios by the way of
statistical equilibrium calculations allows determination of the physical
parameters: n(H2)~(1-2)e6 ... | 1995-11-20 | 2007-05-23 | [
"astro-ph"
] | C.B. de Boisanger, F.P. Helmich, E.F. van Dishoeck |
astro-ph/9511092 | Dynamo driven accretion discs and dwarf nova eruptions | We explore the consequences of a magnetic dynamo origin for the viscosity in
accretion discs, for the structure and evolution of discs in dwarf nova
systems. We propose that the rapid cooling that sets in at the end of a dwarf
nova eruption acts to inhibit the Balbus-Hawley instability, and thereby to
quench dynamo act... | 1995-11-20 | 2016-01-27 | [
"astro-ph"
] | P.J. Armitage, M. Livio and J.E. Pringle |
astro-ph/9511090 | Stability of spherical stellar systems II : Numerical results | We have performed a series of high resolution N-body experiments on a
Connection Machine CM-5 in order to study the stability of collisionless
self-gravitating spherical systems. We interpret our results in the framework
of symplectic mechanics, which provides the definition of a new class of
particular perturbations: ... | 1995-11-20 | 2015-06-24 | [
"astro-ph"
] | J. Perez (SAP, CEA Saclay), J-M Alimi (LAEC, Observatoire de Meudon),
J-J Aly (SAP, CEA Saclay), H.Scholl (Observatoire de Nice) |
astro-ph/9511085 | Perturbative Growth of Cosmological Clustering II: The Two Point
Correlation | We use the BBGKY hierarchy equations to calculate, perturbatively, the lowest
order nonlinear correction to the two point correlation and the pair velocity
for Gaussian initial conditions in a critical density matter dominated
cosmological model. We compare our results with the results obtained using the
hydrodynamic e... | 1995-11-19 | 2009-10-28 | [
"astro-ph"
] | Somnath Bharadwaj(RRI,India) |
astro-ph/9511087 | Flat Dark Matter Dominated Models with Hybrid Adiabatic Plus
Isocurvature Initial Conditions | We investigate the consequences of flat, dark-matter dominated cosmogonies
with hybrid isocurvature and adiabatic initial perturbations and with
Harrison-Zel'dovich primordial spectrum normalised to the $COBE$-DMR two-year
measurements. We show that whilst the $COBE$-DMR data alone shows no preference
for a specific ad... | 1995-11-19 | 2009-10-28 | [
"astro-ph"
] | R.Stompor (CAMK), K.M. Gorski (GSFC), A.J. Banday (GSFC) |
astro-ph/9511088 | Silicon Burning I: Neutronization and the Physics of Quasi-Equilibrium | As the ultimate stage of stellar nucleosynthesis, and the source of the iron
peak nuclei, silicon burning is important to our understanding of the evolution
of massive stars and supernovae. Our reexamination of silicon burning, using
results gleaned from simulation work done with a large nuclear network (299
nuclei and... | 1995-11-19 | 2009-10-28 | [
"astro-ph"
] | W.R. Hix (CfA) and F.-K. Thielemann (Basel) |
astro-ph/9511086 | ROSAT Results on Groups and Clusters of Galaxies | We present a selection of ROSAT results on the morphology, the evolution, and
the masses of galaxy clusters and groups. ROSAT provides the first complete
X-ray view on the Virgo cluster: it reveals a complex structure similar to the
optical appearance. Indications for ongoing evolution is found in a number of
clusters ... | 1995-11-19 | 2007-05-23 | [
"astro-ph"
] | S. Schindler |
astro-ph/9511084 | The Sunyaev-Zel'dovich Effect and the Value of Omega | We consider the Sunyaev-Zel'dovich (SZ) effect as a probe of Omega_o: Using a
self-consistent modeling of X-ray clusters, we examine the dependence of both
the mean Compton y parameter and the SZ source counts on Omega_o. These
quantities increase with decreasing Omega_o due to the earlier epoch of
structure formation ... | 1995-11-18 | 2011-05-23 | [
"astro-ph"
] | D. Barbosa(1,2), J.G. Bartlett(1), A. Blanchard(1), J. Oukbir(3)
((1)Observatoire de Strasbourg, France, (2)Centro de Astrofisica, Porto,
Portugal, (3)Saclay, France) |
astro-ph/9511082 | Analysis of Low z Absorbers in the QSO Spectra | We present the results of reanalysis of low z Mg II absorption line sample
compiled by SS92. The conditions on cloud parameters to produce N(Fe II)>N(Mg
II) are obtained using photoionization models and curve of growth. Properties
of Mg II absorbers with W(Fe II)/W(MgII) (definded as R) >and< 0.5 are analysed
separatel... | 1995-11-18 | 2009-10-28 | [
"astro-ph"
] | R. Srianand |
astro-ph/9511083 | The Future of Galaxy Populations | What the future holds for the stellar populations of the Milky Way Galaxy may
(optimistically) be predicted by study of their past histories, as written in
the chemical abundance distributions, angular momentum distributions, velocity
dispersion tensor, ages and spatial structure of their constituent older stars. | 1995-11-18 | 2007-05-23 | [
"astro-ph"
] | Rosemary F.G. Wyse |
astro-ph/9511079 | Improved limits on gamma ray burst repetition | We tighten previous upper limits on gamma ray burst repetition by analyzing
the angular power spectrum of the BATSE 3B catalog of 1122 bursts. At 95%
confidence, we find that no more than 2% of all observed bursts can be labeled
as repeaters, even if no sources are observed to repeat more than once. If a
fraction f of ... | 1995-11-17 | 2009-10-07 | [
"astro-ph"
] | Max Tegmark, Dieter Hartmann, Michael Briggs, Jon Hakkila & Charles
Meegan |
astro-ph/9511081 | NLTE Modeling of SNe Ia Near Maximum Light | Modeling the atmospheres of SNe~Ia requires the solution of the NLTE
radiative transfer equation. We discuss the formulation of the radiative
transfer equation in the co-moving frame. For characteristic velocities larger
than about 2000 km/s, the effects of advection on the synthetic spectra are
non-negligible, and hen... | 1995-11-17 | 2007-05-23 | [
"astro-ph"
] | E. Baron, P. H. Hauschildt, and A. Mezzacappa |
astro-ph/9511080 | A consistent explanation for $^{12}$C/$^{13}$C, $^7$Li, and $^3$He
anomalies in red giant stars | The observations of carbon isotopic ratios in evolved stars suggest that non
standard mixing is acting in low mass stars as they are ascending the red giant
branch. We propose a simple consistent mechanism, based on the most recent
developments in the description of rotation-induced mixing by Zahn (1992),
which simulta... | 1995-11-17 | 2009-10-28 | [
"astro-ph"
] | Corinne Charbonnel |
astro-ph/9511077 | Long and Short GRB | We report evidence from the 3B Catalogue that short (T_90 < 10 s) and long
(T_90 > 10 s) GRB represent different populations and processes: Their spectral
behavior is qualitatively different, with short bursts harder in the BATSE
range, but chiefly long bursts detected at higher photon energies; \langle
V/V_max \rangle... | 1995-11-16 | 2016-08-30 | [
"astro-ph"
] | J. I. Katz and L. M. Canel |
astro-ph/9511072 | Distribution of Blue Galaxies in a Merging Cluster of Galaxies Abell 168 | The fraction of star-forming galaxies in rich clusters of galaxies increases
rapidly with the redshift. This is interpreted as the result of a rapid
evolution of cluster galaxies, though its mechanism is not yet clear. One
hypothesis is that if galaxies run into the dense intracluster medium (ICM)
regions, starbursts c... | 1995-11-16 | 2009-10-28 | [
"astro-ph"
] | A. Tomita, F. E. Nakamura, T. Takata, K. Nakanishi, T. Takeuchi, K.
Ohta and T. Yamada |
astro-ph/9511073 | Experimental limits on the contribution of sub-stellar and stellar
objects to the galactic halo | EROS (Exp\'erience de Recherche d'Objets Sombres) has been monitoring the
luminosity of 4 million stars in the Large Magellanic Cloud in order to search
for gravitational microlensing by unseen objects in the galactic halo. We
present here the results from 3 years of EROS Schmidt plates data. Two stars
exhibit light cu... | 1995-11-16 | 2008-02-03 | [
"astro-ph"
] | R. Ansari, et al. (EROS collaboration) |
astro-ph/9511078 | Open Inflation | Open Inflation has recently been suggested as a possible way out of the age
crisis caused by observations of a large rate of expansion of the universe, in
conflict with the existence of very old globular clusters. It proposes that our
local patch of the universe originated in a quantum tunneling event, with the
formati... | 1995-11-16 | 2009-10-28 | [
"astro-ph"
] | Juan Garcia-Bellido |
astro-ph/9511074 | Collisions of Main-Sequence Stars and the Formation of Blue Stragglers
in Globular Clusters | We report the results of new SPH calculations of parabolic collisions between
two main-sequence stars in a globular cluster. Such collisions are directly
relevant to the formation of blue stragglers. In particular, we consider parent
stars of mass $M/M_{TO}=0.2,0.5,0.75$, and $1$, where $M_{TO}$ is the cluster
turnoff ... | 1995-11-16 | 2009-10-28 | [
"astro-ph"
] | J. C. Lombardi, F. A. Rasio, S. L. Shapiro |
astro-ph/9511075 | Contribution of Bremsstrahlung Emission from Lyman-alpha Clouds to the
Microwave Background Fluctuations | I calculate the contribution of Bremsstrahlung emission from Lyman-alpha
absorption clouds to the brightness of the microwave sky. The calculation is
based only on the assumption that the clouds below the Lyman-limit are in
photoionization equilibrium with a UV background radiation, and avoids any
uncertainty about the... | 1995-11-16 | 2009-10-28 | [
"astro-ph"
] | Abraham Loeb (Harvard Univ.) |
astro-ph/9511076 | Sinking Satellites and Tilting Disk Galaxies | The infall of a satellite galaxy onto a galactic disk generally brings in
angular momentum that is not aligned with the axis of the disk. The main
dynamical issues addressed are what fraction of the orbital angular momentum of
the satellite and the associated energy is added to the disk, as opposed to
being left in the... | 1995-11-16 | 2007-05-23 | [
"astro-ph"
] | Siqin Huang and R. G. Carlberg |
astro-ph/9511070 | The Galaxy-Halo Connection: Present Status and Future Prospects | Review paper presented at the meeting "Formation of the Galactic Halo: Inside
and Out", Tucson, October 1995. | 1995-11-15 | 2007-05-23 | [
"astro-ph"
] | Sidney van den Bergh |
astro-ph/9511066 | The Cluster Distribution as a Test of Dark Matter Models. III. the
Cluster Velocity Field | We study the large-scale velocity fields traced by galaxy clusters in
numerical simulations of a box of side 960 $h^{-1}$ Mpc, and compare them with
available data on real clusters. In order to test the reliability of the
simulations, which are based on an optimized version of the Zel'dovich
approximation, we compare t... | 1995-11-15 | 2015-06-24 | [
"astro-ph"
] | Lauro Moscardini, Enzo Branchini, Paolo Tini Brunozzi, Stefano
Borgani, Manolis Plionis, Peter Coles |
astro-ph/9511063 | The variable OVIII Warm Absorber in MCG-6-30-15 | We present the results of a 4 day ASCA observation of the Seyfert galaxy
MCG-6-30-15, focussing on the nature of the X-ray absorption by the warm
absorber, characterizd by the K-edges of the intermediately ionized oxygen,
OVII and OVIII. We confirm that the column density of OVIII changes on a
timescale of $\sim 10^4$~... | 1995-11-15 | 2015-06-24 | [
"astro-ph"
] | C. Otani, T. Kii, C.S. Reynolds, A.C. Fabian, K. Iwasawa, K.
Hayashida, H. Inoue, H. Kunieda, F. Makino, M. Matsuoka, Y. Tanaka |
astro-ph/9511071 | A Method to Estimate the Primordial Power Spectrum from CMB Data | A precise determination of the primordial spectrum of matter density
fluctuations at super-horizon scales is essential in understanding large scale
structure in the universe. Attempts to constrain or obtain the primordial
spectrum using data on cosmic microwave background (CMB) anisotropies has
relied on statistical an... | 1995-11-15 | 2008-11-26 | [
"astro-ph"
] | Rafael Bautista (Univ. de los Andes,Bogota), Sergio Torres
(Observatorio Astronomico, Bogota) |
astro-ph/9511069 | VLA Observations of Ultraluminous IRAS Galaxies: Active Nuclei or
Starbursts? | We employed the Very Large Array (VLA) of the National Radio Astronomy
Observatory in C configuration to map 39 ultraluminous IRAS galaxies at 6~cm
and 20~cm, at resolutions of ~ 4" and 15", respectively, and 24 sources at 6~cm
with in the A configuration with a resolution of ~0.5". Most of the sources
have radio spect... | 1995-11-15 | 2008-11-26 | [
"astro-ph"
] | Thomas Crawford, Jon Marr, Bruce Partridge, and Michael Strauss |
astro-ph/9511065 | A Sample-oriented Catalogue of BL Lacertae Objects | We present a catalogue of 233 BL Lacertae objects compiled through an
extensive bibliographic search updated to mid-1995. A large fraction of the
sources listed in the catalogue belongs to well-defined samples and can be used
for statistical purposes. A smaller fraction consists of miscellaneous (but
confirmed) BL Lacs... | 1995-11-15 | 2015-06-24 | [
"astro-ph"
] | Paolo Padovani and Paolo Giommi |
astro-ph/9511064 | On Self-Similar Global Textures in an expanding Universe | We discuss self-similar solutions to $O(4)$ textures in Minkowski space and
in flat Friedmann-Robertson-Walker backgrounds. We show that in the Minkowski
case there exist no solutions with winding number greater than unity. However,
we find besides the known solution with unit winding number also previously
unknown sol... | 1995-11-15 | 2009-10-28 | [
"astro-ph"
] | Stefan {\AA}minneborg and Lars Bergstr\"om (Stockholm University) |
astro-ph/9511068 | The distribution of pairwise peculiar velocities in the nonlinear regime | The distribution of pairwise, relative peculiar velocities, $f(u;r)$, on
small nonlinear scales, $r$, is derived from the Press--Schechter approach.
This derivation assumes that Press--Schechter clumps are virialized and
isothermal. The virialized assumption requires that the circular velocity, $V_c
\propto M^{1/3}$, w... | 1995-11-15 | 2015-06-24 | [
"astro-ph"
] | Ravi K. Sheth, U.C. Berkeley |
astro-ph/9511067 | Modelling the spectro-photometric and chemical evolution of Low Surface
Brightness spiral galaxies | We investigate the star formation history and chemical evolution of Low
Surface Brightness (LSB) spiral galaxies by means of their observed
spectro-photometric and chemical properties. We present preliminary results for
Johnson-Cousins UBVRI magnitudes and stellar [O/H] abundance ratios using a
galactic chemical evolut... | 1995-11-15 | 2007-05-23 | [
"astro-ph"
] | L.B. van den Hoek and W.J.G. de Blok |
astro-ph/9511058 | The Influence of Environmental Effects on Galaxy Formation | These notes collect together current work on the effect of the environment on
galaxy formation and evolution. They are broken into four distinct parts. The
first deals with the observational debate surrounding the question of whether
galaxies are initially created the same and have only recently been modified by
their ... | 1995-11-14 | 2007-05-23 | [
"astro-ph"
] | Richard G Bower (Univ. Durham, UK) |
astro-ph/9511060 | X-ray detection of SN1988Z with the ROSAT HRI | We report the detection of SN1988Z in X-rays with the ROSAT High Resolution
Imager. The inferred X-ray luminosity of about $10^{41}\ergps$ can be well
explained by assuming that the supernova occurred in a dense circumstellar
medium, consistent with optical observations. SN1988Z is the most distant
supernova yet detect... | 1995-11-14 | 2007-05-23 | [
"astro-ph"
] | A.C. Fabian and R. Terlevich |
astro-ph/9511059 | The spectra of accretion discs in low-mass X-ray binaries | We present self-consistent models for the radiative transfer in
Shakura-Sunyaev accretion discs in bright low-mass X-ray binaries (LMXB). Our
calculations include the full effects of incoherent Compton scattering and the
vertical temperature structure within the disc, as well as the effects of
Doppler blurring and grav... | 1995-11-14 | 2015-06-24 | [
"astro-ph"
] | R.R. Ross and A.C. Fabian |
astro-ph/9511062 | Likelihood Methods and Classical Burster Repetition | We develop a likelihood methodology which can be used to search for evidence
of burst repetition in the BATSE catalog, and to study the properties of the
repetition signal. We use a simplified model of burst repetition in which a
number $N_{\rm r}$ of sources which repeat a fixed number of times $N_{\rm
rep}$ are super... | 1995-11-14 | 2009-10-28 | [
"astro-ph"
] | Carlo Graziani and Donald Q. Lamb |
astro-ph/9511061 | A Tolman Surface Brightness Test for Universal Expansion, and the
Evolution of Elliptical Galaxies in Distant Clusters | We use the intercept of the elliptical galaxy radius--surface brightness (SB)
relation at a fixed metric radius as the standard condition for the Tolman SB
test of the universal expansion. We use surface photometry in the optical and
near-IR of elliptical galaxies in Abell~2390 ($z=0.23$) and Abell~851
($z=0.41$), and ... | 1995-11-14 | 2009-10-28 | [
"astro-ph"
] | M. A. Pahre, S. G. Djorgovski, and R. R. de Carvalho (Palomar
Observatory, Caltech) |
astro-ph/9511054 | On the Formation and Evolution of Common Envelope Systems | We discuss the formation of a common envelope system following dynamically
unstable mass transfer in a close binary, and the subsequent dynamical
evolution and final fate of the envelope. We base our discussion on new
three-dimensional SPH calculations that we have performed for a close binary
system containing a $4\,M... | 1995-11-13 | 2009-10-28 | [
"astro-ph"
] | Frederic A. Rasio (MIT), Mario Livio (STScI) |
astro-ph/9511050 | The Kinematics of Emission-Line Galaxies in Clusters from ENACS | Summary - By using the data from the ESO Nearby Abell Cluster Survey (ENACS),
we have studied the properties of emission-line galaxies (ELG) in clusters. The
fraction of ELG in clusters is 16~\%; this fraction is slightly dependent on
the cluster velocity dispersion, being larger for ``colder'' systems. ELG tend
to occ... | 1995-11-13 | 2007-05-23 | [
"astro-ph"
] | A. Biviano, P. Katgert, A. Mazure, M. Moles, R. den Hartog, P. Focardi |
astro-ph/9511055 | Comments on "Limits on Dark Matter Using Ancient Mica" | To appear in Phys. Rev. Lett. together with the author's Reply. | 1995-11-13 | 2008-11-26 | [
"astro-ph",
"hep-ph"
] | J. I. Collar (Univ. of South Carolina) |
astro-ph/9511057 | Pursuing Parameters for Critical Density Dark Matter Models | We present an extensive comparison of models of structure formation with
observations, based on linear and quasi-linear theory. We assume a critical
matter density, and study both cold dark matter models and cold plus hot dark
matter models. We explore a wide range of parameters, by varying the fraction
of hot dark mat... | 1995-11-13 | 2015-06-24 | [
"astro-ph",
"hep-ph"
] | Andrew R Liddle, David H Lyth, R K Schaefer, Q Shafi and Pedro T P
Viana |
astro-ph/9511051 | The ESO Nearby Abell Cluster Survey. I. Description of the Dataset and
Definition of Physical Systems | Summary - We describe the results of the ESO Key-programme on `Structure and
Dynamics of Rich Galaxy Clusters' (or ENACS). The final database contains a
total of 5634 galaxies in the directions of 107 clusters from the ACO catalogue
with richness $R\ge 1$ and mean redshifts $z \le 0.1$. Of the 5634 redshifts,
4465 are ... | 1995-11-13 | 2007-05-23 | [
"astro-ph"
] | P. Katgert, A. Mazure, J. Perea, R. den Hartog, et al |
astro-ph/9511053 | Sampling Effects on Cosmological Dipoles | We use numerical simulations to investigate the behaviour of the dipole
moment of the spatial distribution of different kinds of mass tracers. We
select density peaks of the simulated matter distribution with mean separations
of 38 and 30 $h^{-1}$ Mpc to represent two samples of rich clusters of
galaxies. We extract, f... | 1995-11-13 | 2015-06-24 | [
"astro-ph"
] | V. Kolokotronis, M. Plionis, P. Coles, S. Borgani and L. Moscardini |
astro-ph/9511052 | The ESO Nearby Abell Cluster Survey. II. The Distribution of Velocity
Dispersions of Rich Galaxy Clusters | Summary - By combining the 5634 redshifts from the ESO Nearby Abell Cluster
Survey (the ENACS) with another 1000 redshifts from the literature we are able
to study the distribution of velocity dispersions for a volume-limited sample
of 128 $R_{\rm ACO} \geq 1$ clusters, out to a redshift $z=0.1$, in a solid
angle of 2.... | 1995-11-13 | 2007-05-23 | [
"astro-ph"
] | A. Mazure, P. Katgert, R. den Hartog, A. Biviano et al |
astro-ph/9511056 | Effect of Large-Scale Structure on Multiply Imaged Sources | We study the effects of large-scale density fluctuations on strong
gravitational lensing. Previous studies have focused mostly on weak lensing,
since large-scale structure alone cannot produce multiple images. When a galaxy
or cluster acts as a primary lens, however, we find that large-scale structure
can produce asymm... | 1995-11-13 | 2009-10-28 | [
"astro-ph"
] | Rennan Bar-Kana (Physics Dept., MIT, Cambridge, MA) |
astro-ph/9511049 | Structure and kinematical properties of the Galaxy at intermediate
galactic latitudes | We have carried out a sample survey in UBVR photometry and proper motions in
different directions in the Galaxy, as part of an investigation of galactic
structure and evolution. Three fields in the direction of galactic anticentre,
centre and antirotation have been surveyed. Using our new data together with
wide-area s... | 1995-11-12 | 2007-05-23 | [
"astro-ph"
] | Devendra Ojha, Olivier Bienayme, Annie Robin, Michel Creze, Vijay
Mohan |
astro-ph/9511048 | Analysis of Ly ${\alpha}$ absorption lines in the vicinity of QSOs | We have compiled, from the literature, a sample of Ly ${\alpha}$ forest lines
in the spectra of 69 QSOs, all observed with a resolution between 60 to 100 km
s$^{-1}$. The sample is studied for proximity effect. We have tried to account
for the effect of blending which is inherent in the intermediate resolution
sample, ... | 1995-11-12 | 2015-06-24 | [
"astro-ph"
] | R. Srianand and Pushpa Khare |
astro-ph/9511047 | SNI: a new mechanism for gamma ray burst. I.Weak magnetic field | We propose a new mechanism for high energy gamma ray burst in Supernova type
I (SNI) explosion. Presupernova is assumed to be a binary system comprised of a
red giant and a white dwarf with a wind accretion. The accretion flow
terminates by the accretion shock in the vicinity of the white dwarf at the
distance of the o... | 1995-11-11 | 2009-10-28 | [
"astro-ph"
] | V.S. Berezinsky, P. Blasi, B.I. Hnatyk |
astro-ph/9511046 | The role of thermal instabilities on the theoretical mass function of
MACHOs | We analyze the primordial protogalactic gas to investigate the role of
thermal instabilities in the formation of condensations that could contribute
to the MACHO mass function. We find that the previrialized protogalaxy could
have undergone a thermally unstable regime which defines a peak in mass
condensations starting... | 1995-11-10 | 2009-10-28 | [
"astro-ph"
] | E.M.de Gouveia Dal Pino, J.E.Horvath and J.A.de Freitas Pacheco |
astro-ph/9511041 | The Nature of Dark Matter | The dynamics of the universe may be dominated by novel weakly interacting
elementary particles, by baryons in an invisible form, by black holes, and
globally by vacuum energy. The main arguments for and against such hypotheses
are reviewed. | 1995-11-10 | 2007-05-23 | [
"astro-ph"
] | Georg G. Raffelt (MPI f. Physik, Munich) |
astro-ph/9511040 | A Group of Galaxies at Redshift 2.38 | We report the discovery of a group of galaxies at redshift 2.38. We imaged
about 10% of a claimed supercluster of QSO absorption-lines at z=2.38 (Francis
& Hewett 1993). In this small field (2 arcmin radius) we detect two Ly-alpha
emitting galaxies. The discovery of two such galaxies in our tiny field
supports Francis ... | 1995-11-10 | 2009-10-28 | [
"astro-ph"
] | Paul Francis (Melbourne), Bruce Woodgate (NASA Goddard), Steve Warren
(Imperial College), Palle Moller (STScI), Marg Mazzolini (Melbourne), Andy
Bunker (Oxford), James Lowenthal (Lick), Ted Williams (Rutgers), Takeo
Minezaki, Yukiyasu Kobayashi, Yuzuru Yoshii (Tokyo) |
astro-ph/9511043 | The 218 day period of the peculiar late B-type star HD 101584 | We have searched for periodicity in the photometric and spectroscopic
variations of the enigmatic star HD 101584 and found a long-term variability on
a typical time scale of 1700 days (4.7 years) and a highly significant period
of 218+-0.7 day. This period is most prominently present in the photometric
indices which ar... | 1995-11-10 | 2007-05-23 | [
"astro-ph"
] | Eric J. Bakker, Henny J.G.L.M. Lamers, L.B.F.M. Waters, Christoffel
Waelkens |
astro-ph/9511045 | Cosmology and galactic rotation curves | We explore the possibility that the entire departure of galactic rotational
velocities from their luminous Newtonian expectation be cosmological in origin,
and show that within the framework of conformal gravity (but not Einstein
gravity apparently) every static observer sees the overall Hubble flow as a
local universa... | 1995-11-10 | 2016-08-30 | [
"astro-ph"
] | Philip D. Mannheim (University of Connecticut) |
astro-ph/9511042 | Doppler peaks from active perturbations | We examine how the qualitative structure of the Doppler peaks in the angular
power spectrum of the cosmic microwave anisotropy depends on the fundamental
nature of the perturbations which produced them. The formalism of Hu and
Sugiyama is extended to treat models with cosmic defects. We discuss how
perturbations can be... | 1995-11-10 | 2010-04-08 | [
"astro-ph"
] | Joao Magueijo (MRAO/DAMTP), Andreas Albrecht (Imperial College), David
Coulson (Penn), Pedro Ferreira (CfPA-Berkeley) |
astro-ph/9511044 | Cooling Flows and Metallicity Gradients in Clusters of Galaxies | The X-ray emission by hot gas at the centers of clusters of galaxies is
commonly modeled assuming the existence of steady-state, inhomogeneous cooling
flows. We derive the metallicity profiles of the intracluster medium expected
from such models. The inflowing gas is chemically enriched by type Ia
supernovae and stella... | 1995-11-10 | 2009-10-28 | [
"astro-ph"
] | Andreas Reisenegger, Jordi Miralda-Escude, and Eli Waxman |
astro-ph/9511037 | Dense Molecular Clouds In The Galactic Center Region : I. HCN (J=1$-$0)
DATA | The Galactic Center regions $-6^\circ \le l \le 6^\circ$ and $-0.8^\circ \le
b \le 0.87^\circ$ are surveyed with HCN J=1$-$0 line (88.6 GHz) on a 4$'$ grid
with the 14 m telescope at the Taeduk Radio Astronomy Observatory. The data
complement the previous $^{13}$CO, CS, and H$_2$CO measurements (Bally \etal
1988, Zylka... | 1995-11-09 | 2009-10-28 | [
"astro-ph"
] | Chang Won Lee |
astro-ph/9511036 | Baryonic Dark Halos: A Model with MACHOS and Cold Gas Globules | The dark matter in the halos of galaxies may well be baryonic, and much of
the mass within them could be in the form of clusters of substellar objects
within which are embedded cold gas globules. Such halos might play an active
role in galaxy formation and evolution. | 1995-11-09 | 2011-04-15 | [
"astro-ph"
] | Ortwin Gerhard (Astron.Inst, Univ.Basel, CH) and Joseph Silk
(Dpt.Astron.&Phys., Univ.Calif., Berkeley, USA) |
astro-ph/9511038 | Variable stars in the field of the old open cluster NGC 2243 | We report results of photometric monitoring of the NGC 2243 field in V and
$I$ filters. Two W~UMa-type systems and three detached eclipsing binaries were
discovered. Both contact systems are likely members of the cluster. One of
detached binaries - variable V1 - has a period P=1.188 day. This variable is
located at the... | 1995-11-09 | 2007-05-23 | [
"astro-ph"
] | Janusz Kaluzny (Warsaw University), Wojciech Krzeminski (Las Campanas
Observatory), Beata Mazur (Copernicus Astronomical Center) |
astro-ph/9511035 | Heavy Elements in the Lyman-$\alpha$\ Forest: Abundances and Clustering
at z=3 | For the purpose of studying the properties of heavy-elements associated with
the Lyman-$\alpha$\ forest, we observed the gravitational lens Q1422+2309. We
used the HIRES instrument on the W.M. Keck telescope to obtain a
high-resolution, very high signal-to-noise spectrum of this z=3.63 quasar; the
spectrum covers wavel... | 1995-11-09 | 2016-01-27 | [
"astro-ph"
] | D.S. Womble, W.L.W. Sargent, R.S. Lyons (California Institute of
Technology) |
astro-ph/9511039 | Horizontal Branch Stellar Evolution | I review aspects of the evolution of horizontal branch (HB) stars. I start by
discussing current topics in the study of HB stellar evolution, including a
brief review of the main determinants of the structure of low-mass core helium
burning stars and of HB morphology. I describe the `first' and `second'
parameter effec... | 1995-11-09 | 2007-05-23 | [
"astro-ph"
] | Ben Dorman (LASP-NASA/GSFC) |
astro-ph/9511029 | Metric perturbations in two-field inflation | We study the metric perturbations produced during inflation in models with
two scalar fields evolving simultaneously. In particular, we emphasize how the
large-scale curvature perturbation $\zeta$ on fixed energy density
hypersurfaces may not be conserved in general for multiple field inflation due
to the presence of e... | 1995-11-08 | 2016-08-24 | [
"astro-ph",
"gr-qc"
] | Juan Garcia-Bellido and David Wands |
astro-ph/9511034 | Rates for Color Shifted Microlensing Events | If the objects responsible for gravitational microlensing (ML) of
Galactic-bulge stars are faint dwarfs, then blended light from the lens will
distort the shape of the ML light curve and shift the color of the observed
star during the event. The resolution in current surveys is not accurate enough
to observe this effec... | 1995-11-08 | 2009-10-28 | [
"astro-ph"
] | Ari Buchalter, Marc Kamionkowski, and R. Michael Rich |
astro-ph/9511031 | SPH simulations of tidally unstable accretion disks in cataclysmic
variables | We numerically study the precessing disk model for superhump in the SU~UMa
subclass of cataclysmic variables, using a two dimensional SPH code
specifically designed for thin disk problems.
Two disk simulations for a binary with mass ratio $q=\frac{3}{17}$ (similar
to OY~Car) are performed, in order to investigate the... | 1995-11-08 | 2015-06-24 | [
"astro-ph"
] | James R. Murray |
astro-ph/9511028 | The clustering of warm and cool IRAS galaxies | We use a series of statistical techniques to compare the clustering of
samples of IRAS galaxies selected on the basis of their far-infrared emission
temperature, to see whether a temperature-dependent effect, such as might be
produced by interaction-induced star formation, could be responsible for the
increase in clust... | 1995-11-08 | 2007-05-23 | [
"astro-ph"
] | Bob Mann (QMW), Will Saunders (Oxford), Andy Taylor (Edinburgh) |
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