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/9512075 | SPH Calculations of Collisions between Main-Sequence Stars | The hydrodynamics of collisions and mergers of main-sequence stars is
discussed in the light of recent 3-D calculations using the smoothed particle
hydrodynamics (SPH) method. Theoretical models for the formation of blue
stragglers are reviewed in the context of recent comparisons between the
observed properties of blu... | 1995-12-12 | 2007-05-23 | [
"astro-ph"
] | Frederic A. Rasio (MIT) |
astro-ph/9512073 | The first simultaneous X-ray/gamma-ray observations of Cyg X-1 by Ginga
and OSSE | We present the results of 4 simultaneous observations of Cygnus X-1 by Ginga
and OSSE. The X-ray/gamma-ray spectra can be described by an intrinsic
continuum and a component due to Compton reflection including an iron K-alpha
line. The intrinsic spectrum at X-ray energies is a power-law with a photon
spectral index of ... | 1995-12-12 | 2007-05-23 | [
"astro-ph"
] | Marek Gierlinski (1), Andrzej A. Zdziarski (2), W. Neil Johnson (3),
Bernard F. Phlips (3), Ken Ebisawa (4), and Chris Done (5) ((1) Astr. Obs.
UJ, Cracow, Poland, (2) Copernicus Astr. Center, Warsaw, Poland, (3) E. O.
Hulburt Center for Space Res., Naval Research Lab, Washington DC, U.S.A., (4)
NASA/GSFC, Gree... |
astro-ph/9512079 | The Search for Neutrino Sources Beyond the Sun | The hope is that in the near future neutrino astronomy, born with the
identification of thermonuclear fusion in the sun and the particle processes
controlling the fate of a nearby supernova, will reach throughout and beyond
our Galaxy and make measurements relevant to cosmology, astrophysics,
cosmic-ray and particle ph... | 1995-12-12 | 2009-10-28 | [
"astro-ph",
"hep-ph"
] | S. Barwick, F. Halzen, and P.B. Price |
astro-ph/9512080 | Ultra-Transparent Antarctic Ice as a Supernova Detector | We have simulated the response of a high energy neutrino telescope in deep
Antarctic ice to the stream of low energy neutrinos produced by a supernova.
The passage of a large flux of MeV-energy neutrinos during a period of seconds
will be detected as an excess of single counting rates in all individual
optical modules.... | 1995-12-12 | 2014-10-13 | [
"astro-ph",
"hep-ph"
] | F. Halzen, J.E. Jacobsen, and E. Zas |
astro-ph/9512068 | Future Possibilities for Observing HI at High Redshift | We briefly review the beginnings of HI astronomy, proceed to an assessment of
our current capabilities in this area, and continue by considering what will be
necessary to push back the frontier to cosmological distances. We then consider
how such a leap in performance might be realized. | 1995-12-12 | 2016-01-27 | [
"astro-ph"
] | Robert Braun (NFRA) |
astro-ph/9512074 | Two Classes of Gamma-Ray Bursts | Data from the 3B Catalogue suggest that short and long GRB are the results of
different classes of events, rather than different parameter values within a
single class: Short bursts have harder spectra in the BATSE bands, but chiefly
long bursts are detected at photon energies over 1 MeV, implying that their
hard photo... | 1995-12-12 | 2007-05-23 | [
"astro-ph"
] | J. I. Katz and L. M. Canel |
astro-ph/9512071 | The Zel'dovich-type approximation for an inhomogeneous universe in
general relativity: second-order solutions | The gravitational instability of inhomogeneities in the expanding universe is
studied by the relativistic second-order approximation. Using the tetrad
formalism we consider irrotational dust universes and get equations very
similar to those given in the Lagrangian perturbation theory in Newtonian
cosmology. Neglecting ... | 1995-12-12 | 2009-10-28 | [
"astro-ph",
"gr-qc"
] | H. Russ, M. Morita, M. Kasai and G. Boerner |
astro-ph/9512078 | Adaptive Smoothed Particle Hydrodynamics: Methodology II | This paper presents an alternative formulation of the ASPH algorithm for
evolving anisotropic smoothing kernels, in which the geometric approach of
Shapiro et al. (1996; Paper I) is replaced by an approach involving a local
transformation of coordinates to those in which the underlying anisotropic
volume changes appear... | 1995-12-12 | 2015-06-24 | [
"astro-ph"
] | J. Michael Owen, Jens V. Villumsen, Paul R. Shapiro, Hugo Martel |
astro-ph/9512077 | The Radio Galaxy 3C265 Contains a Hidden Quasar Nucleus | We report the discovery of broad MgII emission from the high redshift radio
galaxy 3C265 (z=0.81). We detect the broad line in the nuclear spectrum and in
the spatially extended galaxian component, both near the nucleus and in the
spectrum of an off-nuclear knot located 31 kpc south east of the nucleus of the
galaxy. T... | 1995-12-12 | 2009-10-28 | [
"astro-ph"
] | Arjun Dey (NOAO/KPNO) and Hyron Spinrad (UC Berkeley) |
astro-ph/9512076 | The Post-Merger Elliptical NGC 1700: Stellar Kinematic Fields to Four
Effective Radii | We have measured the stellar motions in the elliptical galaxy NGC 1700 along
four position angles, to very large radii, using absorption features in spectra
obtained with the Multiple Mirror Telescope. Our data extend the coverage of
the stellar velocity field by a factor of 5 (2.5 times further in radius and
twice as ... | 1995-12-12 | 2009-10-28 | [
"astro-ph"
] | Thomas S. Statler (U. of North Carolina, Chapel Hill and Ohio U.),
Tammy Smecker-Hane (Dominion Astrophys. Obs. and U. of California at Irvine),
and Gerald N. Cecil (U. of North Carolina, Chapel Hill) |
astro-ph/9512067 | Measurements of Anisotropy in the Cosmic Microwave Background Radiation
at 0\fdg5 Scales near the Stars HR5127 and Phi Herculis | We present measurements of cosmic microwave background (CMB) anisotropy near
the stars HR5127 and Phi Herculis from the fifth flight of the Millimeter-wave
Anisotropy eXperiment (MAX). We scanned 8\arcdeg\ strips of the sky with an
approximately Gaussian 0\fdg5 FWHM beam and a 1\fdg4 peak to peak sinusoidal
chop. The i... | 1995-12-12 | 2009-10-28 | [
"astro-ph"
] | S. T. Tanaka, A. C. Clapp, M. J. Devlin, N. Figueiredo, J. O.
Gundersen, S. Hanany, V. V. Hristov, A. E. Lange, M. A. Lim, P. M. Lubin, P.
R. Meinhold, P. L. Richards, G. F. Smoot, and J. Staren |
astro-ph/9512070 | Automated Detection of Voids in Redshift Surveys | We present a new void search algorithm for automated detection of voids in
three-dimensional redshift surveys. Based on a model in which the main features
of the LSS of the Universe are voids and walls, we classify the galaxies into
wall galaxies and field galaxies and we define voids as continuous volumes that
are dev... | 1995-12-12 | 2009-10-28 | [
"astro-ph"
] | Hagai El-Ad (1), Tsvi Piran (1), Luiz Nicolaci da Costa (2) ((1)
Hebrew University, Jerusalem, Israel, (2) ESO) |
astro-ph/9512069 | A radio Search for high redshift HI absorption | Ground based optical observations have yielded considerable information on
the statistics of damped-lyman alpha systems. In particular these systems are
known to be the dominant repository of the observed neutral gas at high
redshift. However, particularly at high redshift, there is the possibility that
optical observa... | 1995-12-12 | 2016-01-27 | [
"astro-ph"
] | Jayaram N. Chengalur, A. G. de Bruyn, R. Braun, C. L. Carilli |
astro-ph/9512072 | Ultraviolet Imaging and Spectroscopy of LINERs | I review the UV properties of LINERs (low-ionization nuclear emission-line
regions), based mostly on the recent {\it HST} UV imaging survey of nearby
galaxies by Maoz et al. (1995). 25 of the galaxies in the northern subsample
host a LINER nucleus. Six of these display a prominent compact ($<$ few pc)
nuclear UV ($\sim... | 1995-12-12 | 2007-05-23 | [
"astro-ph"
] | Dan Maoz (Tel-Aviv University) |
astro-ph/9512061 | Polytropic gas spheres: An approximate analytic solution of the
Lane-Emden equation | Polytropic models play a very important role in galactic dynamics and in the
theory of stellar structure and evolution. However, in general, the solution of
the Lane-Emden equation can not be given analytically but only numerically. In
the Lane-Emden equation can not be given analytically but only numerically. In
this ... | 1995-12-11 | 2015-06-24 | [
"astro-ph"
] | F.K. Liu (International School for Advanced Studies, Trieste, Italy) |
astro-ph/9512059 | Results from Monitoring the Broad-Line Radio Galaxy 3C 390.3 | During 1995, the broad-line radio galaxy 3C 390.3 is the subject of a
multi-wavelength monitoring campaign comprised of ROSAT HRI, IUE, and ground
based optical, infrared and radio observations. We report preliminary results
from the monitoring campaign focusing on the X-ray observations. Snapshot ROSAT
observations be... | 1995-12-11 | 2007-05-23 | [
"astro-ph"
] | K. M. Leighly (RIKEN), M. Dietrich (Landessternwarte Heidelberg), E.
Waltman (NRL), R. Edelson (University of Iowa), I. George (USRA/NASA/GSFC),
M. Malkan (University of California), M. Matsuoka (RIKEN), R. Mushotzky
(NASA/GSFC), B. M. Peterson (Ohio State University) |
astro-ph/9512057 | Autofib Redshift Survey - I. Evolution of the Galaxy Luminosity Function | We present a detailed determination of the restframe B-band galaxy luminosity
function (LF) as a function of redshift and star formation activity from z=0 to
z=0.75. The dataset used for this purpose is a combined sample of over 1700
redshifts spanning a wide range in apparent magnitude, 11.5<B<24.0, which we
term the ... | 1995-12-11 | 2015-06-24 | [
"astro-ph"
] | Richard S. Ellis, Matthew Colless, Tom Broadhurst, Jeremy Heyl & Karl
Glazebrook |
astro-ph/9512064 | A Self-Consistent Dynamical Model for the COBE Detected Galactic Bar | A 3D steady state stellar dynamical model for the Galactic bar is constructed
with 485 orbit building blocks using an extension of Schwarzschild technique.
The weights of the orbits are assigned using non-negative least square method.
The model fits the density profile of the COBE light distribution, the observed
solid... | 1995-12-11 | 2015-06-24 | [
"astro-ph"
] | HongSheng Zhao(MPA-Garching) |
astro-ph/9512065 | A Consistent Microlensing Model for the Galactic Bar | We compute a microlensing map for the Galactic bar. The predicted event rate
and event duration distribution are consistent with the $55$ events recently
reported by the MACHO and OGLE collaborations. Most of the events are due to
lensing by stars in the near end of the bar. Lens mass functions with about
30-60\% of le... | 1995-12-11 | 2015-06-24 | [
"astro-ph"
] | HongSheng Zhao(MPA-Garching), R.M. Rich(CU), D.N. Spergel(PU) |
astro-ph/9512056 | The X-ray spectrum of the Gamma Bright Quasar S5 0836+710 | We present the results of an ASCA observation of the high redshift flat
spectrum radio quasar S5 0836+710. The $\sim 0.4-10$ keV X-ray spectrum is
remarkably flat with $\Gamma \sim 1.4$ and substantial intrinsic absorption at
low energy. The spectral slope was found to be in good agreement with the
non--simultaneous RO... | 1995-12-11 | 2007-05-23 | [
"astro-ph"
] | A. Comastri (Oss. Astr. di Bologna, RIKEN), M. Cappi (RIKEN) and M.
Matsuoka (RIKEN) |
astro-ph/9512062 | On the Spectral Slopes of Hard X-ray Emission from Black Hole Candidates | Most black hole candidates exhibit characteristic power-law like hard X-ray
emission above $\sim$ 10 keV. In the {\em high state}, in which 2 -- 10 keV
luminosity is relatively high, the energy index of the hard X-ray emission is
usually greater than 1 --- typically $\sim 1.5$. On the other hand, in the {\em
low state}... | 1995-12-11 | 2015-06-24 | [
"astro-ph"
] | Ken Ebisawa, Lev G. Titarchuk and Sandip K. Chakrabarti |
astro-ph/9512063 | Cluster Cores, Gravitational Lensing, and Cosmology | Many multiply--imaged quasars have been found over the years, but none so far
with image separation in excess of $8\arcsec$. The absence of such large
splittings has been used as a test of cosmological models: the standard Cold
Dark Matter model has been excluded on the basis that it predicts far too many
large--separa... | 1995-12-11 | 2009-10-28 | [
"astro-ph"
] | Ricardo A. Flores (UM-St. Louis) and Joel R. Primack (UC-Sta. Cruz) |
astro-ph/9512066 | New Parametrizations of Non-Gaussian Line-of-sight Velocity Distribution | A five-parameter fitting formula for the line-of-sight stellar velocity
distributions of steady state systems is proposed. It can faithfully reproduce
velocity distributions of theoretical models ranging from nearly Gaussian
profiles to strongly skewed or mildly double-peaked profiles. In contrast to
van der Marel and ... | 1995-12-11 | 2015-06-24 | [
"astro-ph"
] | HongSheng Zhao(MPA-Garching) and Francisco Prada(MPE,IAC) |
astro-ph/9512060 | The Square Kilometer Array Interferometer | The scientific motivation is reviewed for a next generation radio observatory
operating at frequencies between about 200 MHz and 2 GHz with about 2 orders of
magnitude greater sensitivity than that which is currently available, together
with sub-arcsecond angular resolution. Instrumental concepts for the telescope
are ... | 1995-12-11 | 2016-11-03 | [
"astro-ph"
] | Robert Braun (NFRA) |
astro-ph/9512058 | The Environment of ``E+A'' Galaxies | The violent star formation history of ``E+A'' galaxies and their detection
almost exclusively in distant clusters is frequently used to link them to the
``Butcher-Oemler effect'' and to argue that cluster environment influences
galaxy evolution. From 11113 spectra in the Las Campanas Redshift Survey, we
have obtained a... | 1995-12-11 | 2009-05-29 | [
"astro-ph"
] | A.I. Zabludoff (OCIW), D. Zaritsky (UCSC/Lick), H. Lin (UToronto), D.
Tucker (Potsdam), Y. Hashimoto (Yale), S.A. Shectman (OCIW), A. Oemler
(Yale), and R.P. Kirshner (CfA) |
astro-ph/9512054 | Clumpy Cold Dark Matter and Biological Extinctions | Cosmological models with cosmic string and texture seeded universes predict a
present abundance of very dense clumps of Cold Dark Matter particles. Their
crossing through the solar system would induce a non-negligible amount of
radiation damage to all living tissue; the severity of such an episode is
assessed. The esti... | 1995-12-10 | 2009-10-28 | [
"astro-ph"
] | J.I.Collar (G.P.S., Univ. Paris 7) |
astro-ph/9512055 | Reconstructing Positions \& Peculiar Velocities of Galaxy Clusters
within 25000 km/sec: The Bulk Velocity | Using a dynamical 3-D reconstruction procedure we estimate the peculiar
velocities of $R\ge0$ Abell/ACO galaxy clusters from their measured redshift
within 25000 km/sec. The reconstruction algorithm relies on the linear
gravitational instability hypothesis, assumes linear biasing and requires an
input value of the clus... | 1995-12-10 | 2009-10-28 | [
"astro-ph"
] | Enzo Branchini, Manolis Plionis and Dennis W. Sciama |
astro-ph/9512053 | Advection-Dominated Accretion Flows: Optically Thin Solutions | General properties of advection-dominated accretion flows are discussed.
Special emphasis is given to the optically thin branch of solutions, which has
very high ion and electron temperatures and is thermally stable. This solution
branch has been applied to a number of low-luminosity accreting black holes.
The models h... | 1995-12-09 | 2007-05-23 | [
"astro-ph"
] | Ramesh Narayan |
astro-ph/9512050 | The dynamics of planetary nebulae in the Galaxy: evidence for a third
integral | We present a dynamical analysis of 673 galactic Planetary Nebulae, using a
two-integral axisymmetric model with a Kuzmin-Kutuzov St\"{a}ckel potential.
The method fits the kinematics to the projected moments of a distribution
function, by means of Quadratic Programming. The 2.2 $\mu$m COBE brightness map
has been used ... | 1995-12-08 | 2007-05-23 | [
"astro-ph"
] | S. Durand, H. Dejonghe, and A. Acker |
astro-ph/9512047 | Cosmological Applications of Gravitational Lensing | The last decade has seen an enormous increase of activity in the field of
gravitational lensing, mainly driven by improvements of observational
capabilities. I will review the basics of gravitational lens theory, just
enough to understand the rest of this contribution, and will then concentrate
on several of the main a... | 1995-12-08 | 2015-06-24 | [
"astro-ph"
] | Peter Schneider (Max-Planck-Institut f\"ur Astrophysik, Garching,
Germany) |
astro-ph/9512052 | A Deep Multicolor Survey II. Initial Spectroscopy and Comparison With
Expected Quasar Number Counts | We have used the KPNO 4-meter Mayall telescope to image 0.83 square degrees
of sky in six fields at high galactic latitude in six filters spanning
3000-10000\AA\ to magnitude limits ranging from 22.1 to 23.8. As a first use of
this database, we have conducted a multicolor survey for quasars. We discuss
various methods ... | 1995-12-08 | 2009-10-28 | [
"astro-ph"
] | Patrick B. Hall (University of Arizona), Patrick S. Osmer (Ohio State
University), Richard F. Green, Alain C. Porter (NOAO), Stephen J. Warren
(Imperial College) |
astro-ph/9512044 | On the Evoution of the Light Elements I. D, He-3, and He-4 | The light elements D, \he3, \he4, and \li7 are produced in big bang
nucleosynthesis and undergo changes in their abundances due to galactic
processing. Since one may observe most of these elements only in contemporary
environments, knowledge of the intervening evolution is necessary for
determining the observational co... | 1995-12-08 | 2008-11-26 | [
"astro-ph"
] | Brian Fields (Univ. of Notre Dame) |
astro-ph/9512049 | Abundance Determinations from Gamma Ray Spectroscopy | Gamma ray emission lines resulting from accelerated particle bombardment of
ambient gas can serve as an important spectroscopic tool for abundance
determinations. The method is illustrated by considering the gamma ray line
emission observed from solar flares. The observation of similar gamma ray lines
from Orion sugges... | 1995-12-08 | 2007-05-23 | [
"astro-ph"
] | Reuven Ramaty |
astro-ph/9512046 | Observation of Extended Red Emission (ERE) in the halo of M82 | Low-dispersion spectra have been obtained from 4000 to 9600 \AA~along the
axis and across the dusty halo of the galaxy M82. The spectra of the halo are
explained in terms of scattering of the galactic light by dust grains: when
divided by the spectrum of the galaxy, they reveal a broad emission band,
similar to, althou... | 1995-12-08 | 2007-05-23 | [
"astro-ph"
] | J.-M. Perrin, S. Darbon, J.-P. Sivan (Observatoire de Haute Provence
du CNRS) |
astro-ph/9512051 | A Deep Multicolor Survey I. Imaging Observations and Catalog of Stellar
Objects | We have used the KPNO 4-meter Mayall telescope to image 0.83 square degrees
of sky in six fields at high galactic latitude in six filters spanning
3000-10000\AA\ to magnitude limits ranging from 22.1 to 23.8. We have assembled
a catalog of 21,375 stellar objects detected in the fields for use primarily in
conducting a ... | 1995-12-08 | 2009-10-28 | [
"astro-ph"
] | Patrick B. Hall (University of Arizona), Patrick S. Osmer (Ohio State
University), Richard F. Green, Alain C. Porter (NOAO), Stephen J. Warren
(Imperial College) |
astro-ph/9512048 | ROSAT PSPC observations of six PG quasars and PHL 1657 | We report results from the spectral analysis of pointed ROSAT PSPC
observations of six PG quasars and the weak-bump quasar PHL 1657. Disregarding
other frequency bands, the PSPC data are represented best by simple power-law
source spectra ($dN/dE \propto E^\Gamma$) with a slope $\Gamma = -2.5\pm 0.4$
and do not show ev... | 1995-12-08 | 2007-05-23 | [
"astro-ph"
] | Joerg P. Rachen, Karl Mannheim and Peter L. Biermann |
astro-ph/9512045 | Ultrasoft transient X-ray emission from AGN | We report some remarkable and unexpected results of optical/UV/X-ray
follow-up observations of bright soft X-ray selected AGN from the ROSAT
All-Sky-Survey. The majority of these AGN are rather anonymous Seyfert
galaxies, mostly of the narrow-line Seyfert 1 subtype (nlSy1). We confirm the
well-known X-ray variability b... | 1995-12-08 | 2007-05-23 | [
"astro-ph"
] | K. Mannheim, D. Grupe, K. Beuermann, H.-C. Thomas, and H.H. Fink |
astro-ph/9512040 | Interaction in the Bimodal Galaxy Cluster A3528 | X-ray and radio continuum observations of the bimodal cluster A3528 in the
Shapley Supercluster are presented. From a ROSAT PSPC pointed observation we
find a marginal tendency of the intracluster gas to be hotter in the region
between the two subclusters. This effect can be interpreted as the signature of
interaction ... | 1995-12-07 | 2015-06-24 | [
"astro-ph"
] | S. Schindler |
astro-ph/9512035 | H I, H II, and R-Band Observations of a Galactic Merger Sequence | We present high-quality aperture synthesis observations of the neutral
hydrogen distribution in a sample of five galactic systems believed to be
involved in progressive stages of merging: Arp295, NGC4676, NGC520, NGC3921,
and NGC7252. These data are supplemented by wide-field images taken through a
narrow band Halpha f... | 1995-12-07 | 2009-10-28 | [
"astro-ph"
] | J.E. Hibbard (IfA), J.H. van Gorkom (Columbia Univ) |
astro-ph/9512033 | The Serendipitous Discovery of a Group or Cluster of young Galaxies at
z=2.40 in Deep Hubble Space Telescope WFPC2 Images | We report the serendipitous discovery of a group or cluster of young galaxies
at $z\simeq$2.40 in a 24-orbit HST/WFPC2 exposure of the field around the weak
radio galaxy 53W002. Potential cluster members were identified on ground-based
narrow-band redshifted Ly$\alpha$ images and confirmed via spectroscopy.
In additi... | 1995-12-07 | 2016-08-30 | [
"astro-ph"
] | Sebastian M. Pascarelle (ASU), Rogier A. Windhorst (ASU), Simon P.
Driver (ASU), Eric J. Ostrander (ASU), William C. Keel (UoAl) |
astro-ph/9512037 | Modeling the Clustering of Objects | I review the main steps made so far towards the construction of a (semi)
analytical model for describing the growth history of bound virialized objects
or haloes in the gravitational instability scenario. I mainly focus on those
models relying on the spherical collapse approximation which have led to the
most complete ... | 1995-12-07 | 2007-05-23 | [
"astro-ph"
] | E. Salvador-Sole (University of Barcelona) |
astro-ph/9512042 | Isolating the Foreground of the X-Ray Background | The foreground component of the X-ray Background (XRB) can be studied by
cross-correlating its intensity with galaxy catalogs. We computed the two-point
cross-correlation function $W_{xg}$ between 67 {\em Einstein} X-ray fields and
the APM galaxy catalog. We detected a signal with an amplitude of $W_{xg} = .04
\pm .01$... | 1995-12-07 | 2007-05-23 | [
"astro-ph"
] | A. Refregier, D.J. Helfand (Columbia University), and R.G. McMahon
(Cambridge University) |
astro-ph/9512036 | Chaos and Tidal Capture | We review the tidal capture mechanism for binary formation, an important
process in globular cluster cores and perhaps open cluster cores. Tidal capture
binaries may be the precursors for some of the low-mass X-ray binaries observed
in abundance in globular clusters. They may also play an important role in
globular clu... | 1995-12-07 | 2007-05-23 | [
"astro-ph"
] | Rosemary A. Mardling (Monash Univ.) |
astro-ph/9512039 | Probing Cluster Potentials through Gravitational Lensing of Background
X-Ray Sources | We examine the gravitational lensing effect of a foreground galaxy cluster on
the number count statistics of background X-ray sources. The lensing produces a
deficit in the number of resolved sources in a ring close to the critical
radius of the cluster. This deficit could be detected at the $\sim 3\sigma$
level with t... | 1995-12-07 | 2007-05-23 | [
"astro-ph"
] | Alexandre Refregier and Abraham Loeb |
astro-ph/9512041 | The WARPS survey for faint Clusters of Galaxies | The WARPS cluster survey is based on the ROSAT PSPC archive of pointed
observations. It includes extended X-ray sources, detected with the Voronoi
Tessellation and Percolation algorithm (VTP), and point-like X-ray sources with
non-stellar optical counterparts. It is designed to minimize selection effects
whilst coverin... | 1995-12-07 | 2007-05-23 | [
"astro-ph"
] | L.R. Jones, C.A. Scharf, E.Perlman (NASA/Goddard), H. Ebeling (IoA),
G. Wegner (Dartmouth), M. Malkan (UCLA) |
astro-ph/9512043 | Neutral Hydrogen in the Ringed Barred Galaxies NGC 1433 and NGC 6300 | We have made observations of the \ion{H}{1} in the southern ringed barred
spiral galaxies NGC~1433 and NGC~6300 with the Australia Telescope Compact
Array (ATCA), the main goal being to test the resonance theory for the origin
of these rings. NGC~1433 is the prototypical ringed barred spiral, and displays
distinct \ion... | 1995-12-07 | 2009-10-28 | [
"astro-ph"
] | Stuart D. Ryder (1, now 2), Ronald J. Buta (1), Hector Toledo (1),
Hemant Shukla (1), Lister Staveley-Smith (3), Wilfred Walsh (2,3) ((1)
University of Alabama, (2) University of New South Wales, (3) Australia
Telescope National Facility) |
astro-ph/9512038 | Neutrino Scattering in Strangeness-Rich Stellar Matter | We calculate neutrino cross sections from neutral current reactions in dense
matter containing hyperons. We show that Sigma- hyperons give significant
contributions. To lowest order, the contributions from the neutral Lambda and
Sigma0, which have zero hyper-charge, vanish. However, their presence furnishes
baryon numb... | 1995-12-07 | 2008-02-03 | [
"astro-ph"
] | Sanjay Reddy and Madappa Prakash |
astro-ph/9512034 | LiBeB Production by Nuclei and Neutrinos | The production of LiBeB isotopes by nuclear and neutrino spallation are
compared in the framework of galactic evolutionary models. As motivated by
$\gamma$-ray observations of Orion, different possible sources of low-energy C
and O nuclei are considered, such as supernovae of various masses and WC stars.
We confirm tha... | 1995-12-07 | 2009-09-15 | [
"astro-ph"
] | Elisabeth Vangioni-Flam, Michel Cass\'e, Brian D. Fields, and Keith A.
Olive |
astro-ph/9512030 | The Proximity Effect of QSO Metal Line Absorption Systems on Lyman
$\alpha$ Forests | The proximity effect of metal line absorption systems in spectra of high
redshift quasars and quasar pairs is investigated through the distribution of
\Lyalpha forests. No strong proximity effect is found down to 500 km/sec away
from a metal line absorption system for lyman $\alpha$ clouds with
$13.3\le\log\NHI <13.8$ ... | 1995-12-06 | 2007-05-23 | [
"astro-ph"
] | Xiangdong Shi (Queen's University) |
astro-ph/9512023 | The Inverse-Compton And Extragalactic Components Of The Diffuse
Gamma-Ray Emission | We present spectra of the inverse-Compton and extragalactic components of the
high-energy gamma-radiation based on an analysis of the emission at high
galactic latitudes ($\vert$b$\vert$ $\geq$ $30\deg$). We correlate the
gamma-ray intensity with a model consisting of an isotropic component, a
component proportional to... | 1995-12-06 | 2009-10-28 | [
"astro-ph"
] | Andrew Chen (1), Joseph Dwyer (1, now 2), Philip Kaaret (1) ((1)
Columbia University, (2) University of Maryland at College Park) |
astro-ph/9512024 | Are the Lyman alpha forest "clouds" expanding pancakes? | The large sizes of Lyman alpha ``clouds'' inferred from coincident absorption
in the spectrum of close quasar pairs suggests that these are transient
flattened structures of small overdensity. It is argued that the observed
absorbers should be preferentially located in underdense regions of the
universe and should typi... | 1995-12-06 | 2007-05-23 | [
"astro-ph"
] | Martin G. Haehnelt (Max-Planck-Institut fuer Astrophysik, Garching) |
astro-ph/9512025 | The Line Emission from the Circumstellar Gas Around SN 1987A | The narrow emission lines from the inner ring around SN 1987A during the
first $\sim 2000$ days are modeled. The analysis extends that in Lundqvist &
Fransson (1991) to include an improved description for the geometry, a
multi-density structure of the emitting gas, results from improved calculations
for the evolu- tion... | 1995-12-06 | 2009-10-28 | [
"astro-ph"
] | P. Lundqvist, C. Fransson |
astro-ph/9512026 | Evidence for Secular Evolution in Late-Type Spirals | We combine deep optical and IR photometry for 326 spiral galaxies from two
recent galaxy samples and report that the surface brightness profiles of
late-type spirals are best fit by two exponentials. Moreover, the ratio of
bulge and disk scale lengths takes on a restricted range of values and is
uncorrelated with Hubbl... | 1995-12-06 | 2009-10-28 | [
"astro-ph"
] | S. Courteau (NOAO/KPNO), R.S. de Jong (Durham), A.H. Broeils (Cornell) |
astro-ph/9512029 | A note on the neutrino decay line and the possibilities of its detection | Using simple physical reasoning we have estimated the wavelengths and
line-widths of spectral lines arising from the decays of massive neutrinos. We
have, also, to some extent, discussed the possible consequences of these decays
in observable astrophysical settings. We have compared our conclusions with the
predictions... | 1995-12-06 | 2007-05-23 | [
"astro-ph"
] | Srdjan Samurovic (People's Observatory), Vladan Celebonovic (Institute
of Physics) |
astro-ph/9512028 | A search for distant X-ray galaxy clusters | We report on the progress of our search for serendipitous distant X-ray
galaxy clusters in the ROSAT PSPC pointed observations archive. The initial aim
of our work is to measure the X-ray luminosity function of clusters down to 4 x
10^-14 erg cm^-2 s^-1 and so test the claims of cluster evolution at moderate
redshifts.... | 1995-12-06 | 2007-05-23 | [
"astro-ph"
] | D.J. Burke (1), C.A. Collins (2), R.C. Nichol (3), A.K. Romer (4), B.
Holden (3), R.M. Sharples (1) and M.P. Ulmer (4) ((1) Durham University, (2)
Liverpool John Moores University, (3) University of Chicago, (4) Northwestern
University) |
astro-ph/9512032 | Broad Absorption Line QSOs Observed by the ROSAT PSPC | Recent results from the ROSAT All-Sky Survey (RASS) have shown that broad
absorption line (BAL) QSOs are either highly absorbed or underluminous in the
soft X-ray bandpass. Here, we extend this work by analyzing all known bona fide
BALQSOs observed within the inner 20' of the ROSAT PSPC. This sample includes
both targe... | 1995-12-06 | 2009-10-28 | [
"astro-ph"
] | Paul J. Green and Smita Mathur (CfA) |
astro-ph/9512027 | Non-Explosive Hydrogen Burning: Where Do We Stand? | The impact of nuclear physics uncertaintites on the abundances predicted to
emerge from the cold CNO, NeNa and MgAl modes of hydrostatic hydrogen burning
is discussed in the framework of a simple parametric model. In addition of
being able to mimic qualitatively detailed stellar model predictions, these
parametric calc... | 1995-12-06 | 2007-05-23 | [
"astro-ph"
] | M. Arnould, N. Mowlavi, and A. Champagne |
astro-ph/9512031 | Cosmological Inflation and the Nature of Time | Recent advances in observational cosmology are changing the way we view the
nature of time. In general relativity, the freedom in choosing a time
hypersurface has hampered the implementation of the theory. Fortunately,
Hamilton-Jacobi theory enables one to describe all time hypersurfaces on an
equal footing. Using an e... | 1995-12-06 | 2007-05-23 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | D. S. Salopek |
astro-ph/9512020 | Estimates of Doppler Factors, Outflow Angles, and Bulk Lorentz Factors
for a Sample of Compact Radio Sources | Two key results are presented in this paper. First, equipartition Doppler
factors have been estimated for a sample of 105 sources with previously
estimated inverse Compton Doppler factors. The different categories of active
galactic nuclei (AGN) have different ranges and typical values of the Doppler
factor; lobe domin... | 1995-12-05 | 2008-02-03 | [
"astro-ph"
] | R. A. Daly, E. J. Guerra, A. Guijosa |
astro-ph/9512017 | Detection of H-alpha emission from the Magellanic Stream: evidence for
an extended gaseous Galactic halo | We have detected faint, diffuse H$\alpha emission from several points along
the Magellanic Stream, using the Rutgers Fabry--Perot Interferometer at the
CTIO 1.5-m telescope. At points on the leading edges of the H I clouds MS II,
MS III, and MS IV, we detect H$\alpha emission of surface brightness $0.37 \pm
0.02$ Rayle... | 1995-12-05 | 2008-11-26 | [
"astro-ph"
] | Benjamin J. Weiner and T.B. Williams (Rutgers Univ.) |
astro-ph/9512019 | Phase Lags and Coherence of X-Ray Variability in Black Hole Candidates | The ``low'' (hard or ``non-thermal'') state of black hole candidates is
sometimes modelled via an optically thick, hot Compton cloud that obscures a
softer input source such as an accretion disk. In these models the observed
output spectra consist entirely of photons reprocessed by the cloud, making it
difficult to ext... | 1995-12-05 | 2015-06-24 | [
"astro-ph"
] | Michael A. Nowak (JILA), and Brian A. Vaughan (Caltech) |
astro-ph/9512018 | Magnetic braking of T Tauri stars | We construct models for the rotation rates of T Tauri stars whose spin is
regulated by magnetic linkage between the star and a surrounding accretion
disc. Our models utilise a time-dependent disc code to follow the accretion
process and include the effects of pre-main-sequence stellar evolution. We find
that the initia... | 1995-12-05 | 2015-06-24 | [
"astro-ph"
] | P.J. Armitage and C.J. Clarke |
astro-ph/9512022 | Search for neutron star spin periods in X-ray bursts | We report a search for pulsations in 147 Type 1 X-ray bursts observed with
EXOSAT in 10 X-ray burst sources. Instead of treating each burst separately, we
incoherently averaged the power spectra of all of the bursts of a given burster
to improve statistics. No periodicities were detected; 99% confidence upper
limits on... | 1995-12-05 | 2007-05-23 | [
"astro-ph"
] | H. C. Jongert and M. van der Klis (Astronomical Institute ``Anton
Pannkekoek'', University of Amsterdam) |
astro-ph/9512016 | Small Scale Structure and High Redshift HI | Cosmological simulations with gas dynamics suggest that the Lyman-alpha
forest is produced mainly by "small scale structure" --- filaments and sheets
that are the high redshift analog of today's galaxy superclusters. There is no
sharp distinction between Lyman-alpha clouds and "Gunn-Peterson" absorption
produced by the... | 1995-12-05 | 2016-01-27 | [
"astro-ph"
] | David H. Weinberg, Lars Hernquist, Neal Katz, Jordi Miralda-Escude |
astro-ph/9512021 | Determining cosmic microwave background anisotropies in the presence of
foregrounds | Separating foregrounds from the signal is one of the big challenges in cosmic
microwave background (CMB) experiments. A simple way to estimate the CMB
temperature in a given pixel is to fit for the amplitudes of the CMB and the
various foreground components. The variance squared of this estimator is shown
to be equal t... | 1995-12-05 | 2009-10-28 | [
"astro-ph"
] | Scott Dodelson |
astro-ph/9512011 | The Real Space Correlation Function Measured from the APM Galaxy Survey | We present a determination of the real space correlation function for
galaxies in the APM Survey, with magnitudes in the range $17 < b_J < 20$. We
recover a power law form for the correlation function $\xi(r) = (r/4.5)^{-1.7}$
on scales $r < 4 Mpc/h$, for a flat universe and clustering that is fixed in
comoving coordin... | 1995-12-04 | 2015-06-24 | [
"astro-ph"
] | C.M. Baugh (Univ. of Durham, UK) |
astro-ph/9512014 | Cosmological Constant and Statistical Lensing of Giant Arcs | Using a singular isothermal sphere model for the matter distribution of
foreground clusters of galaxies, we study the statistics of giant arcs in flat
cosmologies with and without a cosmological constant. We find that the relative
number of arcs predicted within $z=1$ in a universe with $\Omega_0=0.3$ and
$\lambda_0 \e... | 1995-12-04 | 2009-10-28 | [
"astro-ph"
] | Xiang-Ping Wu (Beijing Astronomical Observatory) and Shude Mao
(Harvard-Smithsonian Center for Astrophysics) |
astro-ph/9512013 | Simulating Galaxy Formation | A review on numerical simulations of galaxy formation is given. Different
numerical methods to solve collisionless and gas dynamical systems are outlined
and one particular simulation technique, Smoothed Particle Hydrodynamics, is
discussed in some detail. After a short discussion of the most relevant
physical processe... | 1995-12-04 | 2007-05-23 | [
"astro-ph"
] | Matthias Steinmetz |
astro-ph/9512012 | A Supersoft X-Ray Binary in the Small Magellanic Cloud | Photometric observations of the supersoft X-ray source 1E 0035.4-7230
obtained during two years reveal that the very blue optical counterpart (V
(maximum)=20.2, B-V=-0.15, U-B=-1.06) undergoes nearly sinusoidal variations
with a period of 0.1719256 days and an amplitude of Delta V~0.3 mag. ROSAT
observations show the X... | 1995-12-04 | 2009-10-28 | [
"astro-ph"
] | P.C. Schmidtke, A.P. Cowley, T.K. McGrath, J.B. Hutchings and D.
Crampton |
astro-ph/9512015 | Globular Cluster Photometry with the Hubble Space Telescope. V. WFPC2
Study of M15's Central Density Cusp | We describe images of the center of the dense globular cluster M15 (NGC 7078)
obtained with the Hubble Space Telescope Wide Field and Planetary Camera 2
(WFPC2). Data taken in the F336W, F439W, and F555W filters (approximately U, B,
and V) are used to study the surface density distribution of the
$\sim3\times10^4$~star... | 1995-12-04 | 2009-10-28 | [
"astro-ph"
] | Puragra Guhathakurta, Brian Yanny, Donald P. Schneider, and John N.
Bahcall |
astro-ph/9512010 | Four new active galaxies with steep soft X-ray spectra | We have discovered four AGN in the ROSAT all-sky-survey data with very steep
X-ray spectra. We apply several models to these X-ray spectra with emphasis on
warm absorber models which give an adequate description of the data. We report
on the follow-up optical and radio observations which allow the identification
of thr... | 1995-12-04 | 2007-05-23 | [
"astro-ph"
] | J. Greiner, R. Danner, N. Bade, G.A. Richter, P. Kroll, S. Komossa |
astro-ph/9512009 | Galaxy Formation and Large-Scale Bias | We outline a simple approach to understanding the physical origin of bias in
the distribution of galaxies relative to that of dark matter. The first step is
to specify how collapsed, virialized halos of dark matter trace the overall
matter distribution. The next step is to make a connection between halos and
the lumino... | 1995-12-04 | 2015-06-24 | [
"astro-ph"
] | Guinevere Kauffmann, Adi Nusser & Matthias Steinmetz |
astro-ph/9512008 | Large scale clustering from Non-Gaussian texture models | A basic ingredient to understand large scale fluctuations in our present day
Universe is the initial conditions. Using N-body simulations, we compare the
clustering that arises from Gaussian and non-Gaussian initial conditions. The
latter is motivated by a global texture model which has initial $J$-order
correlations $... | 1995-12-03 | 2009-10-28 | [
"astro-ph",
"hep-ph"
] | E. Gaztanaga (CSIC, Blanes) and P. Mahonen (Univ. Oulu) |
astro-ph/9512007 | Reconnecting Magnetic Flux Tubes as a Source of In Situ Acceleration in
Extragalactic Radio Sources | Many extended extragalactic radio sources require a local {\it in situ\/}
acceleration mechanism for electrons, in part because the synchrotron lifetimes
are shorter than the bulk travel time across the emitting regions. If the
magnetic field in these sources is localized in flux tubes, reconnection may
occur between r... | 1995-12-03 | 2009-10-28 | [
"astro-ph"
] | Eric G. Blackman (Institute of Astronomy, Cambridge UK) |
astro-ph/9512006 | A Balloon-Borne Millimeter-Wave Telescope for Cosmic Microwave
Background Anisotropy Measurements | We report on the characteristics and design details of the Medium Scale
Anisotropy Measurement (MSAM), a millimeter-wave, balloon-borne telescope that
has been used to observe anisotropy in the Cosmic Microwave Background
Radiation (CMBR) on 0\fdg5 angular scales. The gondola is capable of
determining and maintaining a... | 1995-12-02 | 2009-10-28 | [
"astro-ph"
] | D. J. Fixsen, E. S. Cheng, D. A. Cottingham, W. C. Folz, C. A. Inman,
M. S. Kowitt, S. S. Meyer, L. A. Page, J. L. Puchalla, J. E. Ruhl, and R. F.
Silverberg |
astro-ph/9512005 | Main Sequence Masses and Radii from Gravitational Redshifts | Modern instrumentation makes it possible to measure the mass to radius ratio
for main sequence stars in open clusters from gravitational redshifts. For
stars where independent information is available for either the mass or the
radius, this application of general relativity directly determines the other
quantity. Appli... | 1995-12-02 | 2009-10-28 | [
"astro-ph"
] | Ted von Hippel (University of Wisconsin, USA) |
astro-ph/9512004 | Confirmation of high deuterium abundance in QSO absorbers | We present a new analysis of a Keck spectrum of Q0014+813, with a new model
of the $z=3.32$ absorbing cloud. We fit Lyman series absorption of the dominant
HI components, including components identified with hydrogen and associated
deuterium at two discrete velocities, with thermal line broadening of each
species. The ... | 1995-12-01 | 2009-10-28 | [
"astro-ph"
] | M. Rugers and C. J. Hogan (University of Washington) |
astro-ph/9512001 | Clustering of Faint Galaxies: $\w $, Induced by Weak Gravitational
Lensing | Weak gravitational lensing by large scale structure affects the number counts
of faint galaxies through the ``magnification bias'' and thus affects the
measurement of the angular two-point correlation function $\w $. At faint
magnitudes the clustering amplitude will decrease differently with limiting
magnitude than exp... | 1995-12-01 | 2007-05-23 | [
"astro-ph"
] | Jens Verner Villumsen (Max Planck Institute fur Astrophysik, Garching,
Germany) |
astro-ph/9512003 | Cosmic Deuterium and Baryon Density | Quasar absorption lines now permit a direct probe of deuterium abundances in
primordial material, with the best current estimate $ (D/H)=1.9\pm 0.4 \times
10^{-4}$. If this is the universal primordial abundance $(D/H)_p$, Standard Big
Bang Nucleosynthesis yields an estimate of the mean cosmic density of baryons,
$\eta_... | 1995-12-01 | 2008-02-03 | [
"astro-ph"
] | Craig J. Hogan (University of Washington) |
astro-ph/9512002 | Warm Gas at High Redshift - Clues to Gravitational Structure Formation
from Optical Spectroscopy of Lyman Alpha Absorption Systems | We discuss the effects of gravitational collapse on the shape of absorption
line profiles for low column density (log N(HI) < 14) Lyman Alpha forest clouds
and argue by comparison with cosmological simulations that Lyman alpha forest
observations show the signs of ongoing gravitational structure formation at
high redsh... | 1995-12-01 | 2016-01-27 | [
"astro-ph"
] | Michael Rauch (Astronomy Dept., Caltech) |
astro-ph/9511150 | Gravitational `Convergence' and Cluster Masses | Two colour photometry of the cluster A1689 reveals a `relative
magnification-bias' between lensed blue and red background galaxies, arising
from a dependence of the faint galaxy count-slope on colour. The colour
distribution is skewed blueward of the far field, allowing us to measure the
cluster magnification and to un... | 1995-12-01 | 2007-05-23 | [
"astro-ph"
] | Tom Broadhurst |
astro-ph/9511148 | Doppler peaks and all that: CMB anisotropies and what they can tell us | The power spectrum of fluctuations in the cosmic microwave background (CMB)
depends on most of the key cosmological parameters. Accurate future
measurements of this power spectrum might therefore allow us to determine h,
Omega, Omega_b, Lambda, n, T/S, etc, with hitherto unprecedented accuracy. In
these lecture notes, ... | 1995-11-30 | 2007-05-23 | [
"astro-ph"
] | Max Tegmark |
astro-ph/9511149 | Simulations of Galaxy Formation in Hierarchically Clustering Universes | I review the results of recent N--body/hydrodynamical simulations of the
formation of galaxies in hierarchical universes, with special emphasis on the
structure of dark matter halos, as well as on the mass and angular momentum of
gaseous disks that assemble at the center of these halos. | 1995-11-30 | 2007-05-23 | [
"astro-ph"
] | Julio F. Navarro (Steward Observatory, University of Arizona) |
astro-ph/9511146 | Optimal Smoothing for N-Body Codes | In any collisionless N-body code, there is an optimal choice for the
smoothing parameter that minimizes the average error in the force evaluations.
We show how to compute the optimal softening length in a direct-summation code
and demonstrate that it varies roughly as 1/N^(1/3). | 1995-11-29 | 2009-10-28 | [
"astro-ph"
] | David Merritt (Rutgers) |
astro-ph/9511141 | Hubble Space Telescope Counts of Elliptical Galaxies: Constraints on
Cosmological Models ? | The interpretation of galaxy number counts in terms of cosmological models is
fraught with difficulty due to uncertainties in the overall galaxy population
(mix of morphological types, luminosity functions etc.) and in the observations
(loss of low surface brightness images, image blending etc.). Many of these can
be o... | 1995-11-29 | 2016-08-30 | [
"astro-ph"
] | Simon P. Driver (ASU), Rogier A. Windhorst (ASU), Steven Phillipps
(Univ. Bristol), Paul D. Bristow (Univ. Bristol) |
astro-ph/9511142 | The Production of Ti44 and Co60 in Supernova | The production of the radioactive isotopes $^{44}$Ti and $^{60}$Co in all
types of supernovae is examined and compared to observational constraints
including Galactic $\gamma$--ray surveys, measurements of the diffuse 511 keV
radiation, $\gamma$--ray observations of Cas A, the late time light curve of SN
1987A, and iso... | 1995-11-29 | 2009-10-28 | [
"astro-ph"
] | F.X. Timmes, S.E. Woosley, D.H. Hartmann & R.D. Hoffman |
astro-ph/9511145 | Knots in Magnetized Relativistic Jets and Their Simulations | Bright features (`knots') in extragalactic jets are commonly associated with
reheating of charged particles in regions with shocks or strong compression. We
find a natural appearance of nozzles in simulations of toroidally magnetized
jets, and propose this as a generic mechanism of knotted structures such as in
the jet... | 1995-11-29 | 2007-05-23 | [
"astro-ph"
] | Maurice H.P.M. van Putten |
astro-ph/9511144 | The Tucana dwarf galaxy | Deep CCD photometry (NTT, HST data) for the dwarf galaxy in Tucana is
presented, down to V=27.5. Distance modulus and metallicity are derived,
together with an estimate of the age of the galaxy. | 1995-11-29 | 2007-05-23 | [
"astro-ph"
] | Marco Castellani (1), Gianni Marconi (1), Roberto Buonanno (1) ((1)
Osservatorio Astronomico di Roma, Monte Porzio) |
astro-ph/9511147 | Constraints on the Global Mass-to-Light Ratios and Extent of Dark Matter
Halos in Globular Clusters and Dwarf Spheroidals | The detection of stars in the process of being tidally removed from globular
clusters and dwarf spheroidals in the Galaxy's halo provides a strong
constraint on their mass to light ratios and on the extent of their possible
dark matter halos. If a significant dark matter component existed either within
or beyond the ob... | 1995-11-29 | 2009-10-28 | [
"astro-ph"
] | Ben Moore (UC Berkeley) |
astro-ph/9511143 | An Inflationary Model with an Exact Perturbation Spectrum | We present a new, exact scalar field cosmology for which the spectrum of
scalar (density) perturbations can be calculated exactly. We use this exact
result to the probe the accuracy of approximate calculations of the
perturbation spectrum. | 1995-11-29 | 2009-10-28 | [
"astro-ph",
"gr-qc"
] | Richard Easther (Waseda University) |
astro-ph/9511135 | Caught in the act: The identification of the galaxies responsible for
the faint blue excess | We summarise recent Hubble Space Telescope results on the morphology of faint
field galaxies. Our two principle results are: (1) the galaxies responsible for
the faint blue excess have late-type/irregular morphology and (2) the number
counts of normal galaxies, ellipticals and early-type spirals, are well fit by
standa... | 1995-11-28 | 2007-05-23 | [
"astro-ph"
] | Simon P. Driver (ASU), Rogier A. Windhorst (ASU), Richard E. Griffiths
(JHU) |
astro-ph/9511140 | Strong Angular Clustering of Very Blue Galaxies: Evidence of a Low
Redshift Population | We have studied galaxy two-point angular correlations as a function of color
using 4-m plate photometry in two independent fields. Each field consists of
over 2900 galaxies with magnitudes 20<B_J <23.5 in an area of approximately 750
arcmin^2 . We find that the autocorrelation amplitude of the bluest 15% of
galaxies is... | 1995-11-28 | 2009-10-28 | [
"astro-ph"
] | Stephen D. Landy (Carnegie Observatories), Alexander S. Szalay (Johns
Hopkins Univ.), David C. Koo (Univ. of CA - Santa Cruz) |
astro-ph/9511139 | The Fundamental Plane for cluster E and S0 galaxies | We have analyzed the Fundamental Plane (FP) for a sample of 226 E and S0
galaxies in ten clusters of galaxies. For photometry in Gunn r the best fitting
plane is log r_e=1.24 log sigma - 0.82 log <I>_e + cst. The scatter is 0.084 in
log r_e. The slope of the FP is not significantly different from cluster to
cluster. Th... | 1995-11-28 | 2015-06-24 | [
"astro-ph"
] | Inger Jorgensen (McDonald Observatory), Marijn Franx, Per Kjaergaard |
astro-ph/9511137 | LensMEM: A Gravitational Lens Inversion Algorithm Using the Maximum
Entropy Method | We present a new algorithm for inverting poorly resolved gravitational lens
systems using the maximum entropy method (MEM). We test the method with
simulations and then apply it to an 8 GHz VLA map of the radio ring lens
MG1654+134. We model the lens as a singular isothermal sphere embedded in an
external shear field a... | 1995-11-28 | 2009-10-28 | [
"astro-ph"
] | S. Wallington, C.S. Kochanek & R. Narayan (Harvard-Smithsonian Center
For Astrophysics) |
astro-ph/9511136 | Damping of GRR instability by direct URCA reactions | The role of direct URCA reactions in damping of the gravitational radiation
driven instability is discussed. The temperature at which bulk viscosity
suppresses completely this instability is calculated.
The results are obtained analytically using recent calculations performed in
the case of bulk viscosity due to the ... | 1995-11-28 | 2011-05-23 | [
"astro-ph"
] | J.L. Zdunik |
astro-ph/9511138 | The Single-Degenerate Scenario for Type Ia SNe in Cosmic Perspective | The occurrence and properties of Type Ia supernovae (SNe Ia) in
single-degenerate binary systems (white dwarf [WD] + nondegenerate companion)
is examined for galaxies of different types, and as a function of redshift. The
rates and characteristics (peak luminosities, expansion velocities of the
ejecta) expected from th... | 1995-11-28 | 2009-10-28 | [
"astro-ph"
] | R. Canal, P. Ruiz-Lapuente and A. Burkert |
astro-ph/9511134 | Morphological number-counts from the ultradeep HST images | We discuss the observations leading to the Faint Blue Galaxy problem and the
uncertainties upon which faint galaxy models are based. Using deep Hubble Space
Telescope (HST) imaging with the Wide Field Planetary Camera (WFPC2), we show
how morphological information has been used to shed new light on the problem.
Initial... | 1995-11-28 | 2007-05-23 | [
"astro-ph"
] | Simon P. Driver (ASU), Rogier A. Windhorst (ASU), Richard E. Griffiths
(JHU) |
astro-ph/9511132 | The morphological mix of field galaxies to I=24.25 magnitudes (b=26
magnitudes) from a deep Hubble Space Telescope WFPC2 image | We determine the morphological mix of field galaxies down to $m_{I}\simeq
24.25$ mag ($m_{B}\sim 26.0$ mag) from a single ultradeep HST WFPC2 image in
both the $V_{606}$ and $I_{814}$ filters. In total, we find 227 objects with
$m_{I}\le 24.5$ mag and classify these into three types: ellipticals (16%),
early-type spira... | 1995-11-28 | 2016-08-30 | [
"astro-ph"
] | Simon P. Driver (ASU), Rogier A. Windhorst (ASU), Eric J. Ostrander
(ASU), William C. Keel (UoAl), Richard E. Griffiths (JHU), Kavan U.
Ratnatunga (JHU) |
astro-ph/9511133 | Are disappearing dwarfs just lying low ? | Recent redshift surveys have shown that the excess galaxies seen in faint
galaxy number counts (above those expected given the local galaxy luminosity
function) are not evolved giants at high redshifts, but low to moderate
luminosity objects at more modest redshifts. This has led to the suggestion
that there was once a... | 1995-11-28 | 2015-06-24 | [
"astro-ph"
] | Steven Phillipps (Univ. Bristol), Simon P. Driver (Arizona State Univ) |
astro-ph/9511131 | The proximity effect on the Lyman alpha forest due to a a foreground QSO | The influence of a foreground QSO on the lyman a forest of another QSO with
higher redshift has been investigated by analyzing the spectra of three such
objects at redshifts $z=2 - 2.7$. This influence is not contaminated by any
projection effects, as opposed to the inverse effect along the line of sight,
where incompl... | 1995-11-28 | 2015-06-24 | [
"astro-ph"
] | A. Fernandez-Soto (1 and 2), X. Barcons (1), R. Carballo (1 and 2),
J.K. Webb (3) ((1) IFCA (CSIC-UC)-Santander-SPAIN, (2) Dpt. Fisica Moderna
(UC)-Santander-SPAIN, (3) UNSW-Sydney-AUSTRALIA) |
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