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/9503043 | DIFFRACTION EFFECTS IN MICROLENSING OF Q2237+0305 | Geometrical optics provides an excellent description for quasar images
crossing caustics which are formed by gravitational microlensing of objects
like Q2237+0305. Within this approximation the source size can be estimated
from the maximum magnification reached at caustic crossings. We evaluate the
limitations imposed ... | 1995-03-10 | 2016-08-30 | [
"astro-ph"
] | M. Jaroszynski (Warsaw Obs.) and B. Paczynski (Princeton Obs.) |
astro-ph/9503044 | The Structure of Supervoids -- I: Void Hierarchy in the Northern Local
Supervoid | Supervoids are regions in the local Universe which do not contain rich
clusters of galaxies. We have studied the closest example, the Northern Local
Void, situated between the Local, Coma, and the Hercules superclusters. We find
that this supervoid is not empty, but it contains small galaxy systems and poor
clusters of... | 1995-03-10 | 2016-08-30 | [
"astro-ph"
] | Ulrich Lindner, Jaan Einasto, Maret Einasto, Wolfram Freudling, Klaus
Fricke, Erik Tago |
astro-ph/9503046 | Figure Rotation and the Mass of the Galactic Bulge | The mass of the Galactic bulge, $M_B$, is estimated from the tensor virial
theorem. By including the effects of a barred stellar distribution and figure
rotation (81 \kms kpc $^{-1}$) and by assuming that the bar is oriented at
$\theta$ $=$ 20\deg \ to our line of sight, $M_B$ is found to be as high as
2.8$\times$10$^{... | 1995-03-10 | 2016-08-30 | [
"astro-ph"
] | Robert Blum |
astro-ph/9503045 | Astrophysical Gamma Ray Emission Lines | We review the wide range of astrophysical observations of gamma ray emission
lines and we discuss their implications. We consider line emission from solar
flares, the Orion molecular cloud complex, supernovae 1987A and 1991T, the
supernova remnants Cas A and Vela, the interstellar medium, the Galactic center
region and... | 1995-03-10 | 2016-08-30 | [
"astro-ph"
] | R. Ramaty and R. E. Lingenfelter |
astro-ph/9503042 | A Parallel Processing Algorithm for Computing Short-Range Particle
Forces with Inhomogeneous Particle Distributions | We present a computational algorithm for computing short range forces between
particles. The algorithm has two distinguishing features. First, it is
optimized for multi-processor computers, and will use as many processors as are
available. Second, it is optimized for inhomogeneous, dynamic particle
distributions; for a... | 1995-03-10 | 2008-02-03 | [
"astro-ph",
"comp-gas",
"nlin.CG"
] | Robert C. Ferrell and Edmund Bertschinger |
astro-ph/9503047 | Progress and Prospects in Neutrino Astrophysics | The neutrino deficits observed in four solar neutrino experiments, relative
to the theoretical predictions, have led to fresh insights into neutrino and
solar physics. Neutrino emission from distant, energetic astronomical systems
may form the basis for a new field of astronomy. Additional experiments are
needed to tes... | 1995-03-10 | 2012-08-27 | [
"astro-ph",
"hep-ph",
"nucl-ex"
] | John N. Bahcall, Kenneth Lande, Robert E. Lanou, Jr., John G. Learned,
R. G. Hamish Robertson, and Lincoln Wolfenstein |
astro-ph/9503041 | A Nested Grid Particle-Mesh Code for High Resolution Simulations of
Gravitational Instability in Cosmology | I describe a nested-grid particle-mesh (NGPM) code designed to study
gravitational instability in three-dimensions. The code is based upon a
standard PM code. Within the parent grid I am able to define smaller sub-grids
allowing us to substantially extend the dynamical range in mass and length. I
treat the fields on th... | 1995-03-10 | 2015-06-24 | [
"astro-ph"
] | R.J. Splinter (University of Kentucky) |
astro-ph/9503040 | The Accuracy of Mass Determination in Galaxy Clusters by X-ray
Observations | We test the reliability of mass determination in clusters of galaxies by
X-ray observations. The true mass in cluster models is compared to the mass
derived by the X-ray emission and X-ray temperature of a model assuming
hydrostatic equilibrium and spherical symmetry. In general we find good
agreement between the X-ray... | 1995-03-09 | 2016-08-30 | [
"astro-ph"
] | Sabine Schindler (Max-Planck-Institut fuer extraterrestrische Physik) |
astro-ph/9503038 | The Effects of Substructure on Galaxy Cluster Mass Determinations | Although numerous studies of individual galaxy clusters have demonstrated the
presence of significant substructure, previous studies of the distribution of
masses of galaxy clusters determined from optical observations have failed to
explicitly correct for substructure in those systems. In this {\it Letter} I
present t... | 1995-03-08 | 2016-08-30 | [
"astro-ph"
] | Christina M. Bird |
astro-ph/9503034 | Imaging the Small-Scale Circumstellar Gas Around T~Tauri Stars | We have detected circumstellar molecular gas around a small sample of T Tauri
stars through aperture synthesis imaging of CO(2-1) emission at ~2-3''
resolution. RY Tauri, DL Tauri, DO Tauri, and AS 209 show resolved and
elongated gaseous emission. For RY Tau, the deconvolved, half-maximum radius
along the direction of ... | 1995-03-08 | 2016-08-30 | [
"astro-ph"
] | D. W. Koerner and A. I. Sargent |
astro-ph/9503037 | Evolution of the Supercluster-Void Network | Recently, the observed cellular nature of the large-scale structure of the
Universe with its quasi-regular pattern of superclusters and voids has been
pointed out by several authors. In this paper, we investigate properties of the
initial power spectrum which lead to prediction of structure consistent with
these observ... | 1995-03-08 | 2019-08-17 | [
"astro-ph"
] | P. Frisch, J. Einasto, M. Einasto, W. Freudling, K.J. Fricke,
M.Gramann, V. Saar, O. Toomet |
astro-ph/9503039 | Photon Statistics Limits for Earth-Based Parallax Measurements of MACHO
Events | We analyze the limitations imposed by photon counting statistics on
extracting useful information about MACHOs from Earth-based parallax
observations of microlensing events. We find that if one or more large (say
$2.5\,\rm m$) telescopes are dedicated to observing a MACHO event for several
nights near maximum amplifica... | 1995-03-08 | 2016-08-30 | [
"astro-ph",
"gr-qc"
] | Daniel E. Holz and Robert M. Wald |
astro-ph/9503035 | Gravitational Microlensing by Random Motion of Stars: Analysis of Light
Curves | We present a quantitative analysis of the effect of microlensing caused by
random motion of individual stars in the galaxy which is lensing a background
quasar. We calculate a large number of magnification patterns for positions of
the stars slightly offset from one frame to the next, and in this way obtain
light curve... | 1995-03-08 | 2016-08-30 | [
"astro-ph"
] | Joachim Wambsganss and Tomislav Kundic |
astro-ph/9503036 | Possible Extragalactic Sources of the Highest Energy Cosmic Rays | We give an outline of possible extragalactic explanations of the highest
energy cosmic ray events. We give a classification of the possible particles
which could have caused the events and try to find suitable sources for each
class. In contrast to some previous investigations of other authors, we find a
possible candi... | 1995-03-08 | 2011-04-15 | [
"astro-ph"
] | Joerg P. Rachen (MPIfR Bonn) |
astro-ph/9503033 | Three-Point Correlations in the COBE-DMR Two-Year Anisotropy Maps | We compute the three-point temperature correlation function of the COBE
Differential Microwave Radiometer (DMR) two-year sky maps to search for
evidence of non-Gaussian temperature fluctuations. We detect three-point
correlations in our sky with a substantially higher signal-to-noise ratio than
from the first year data... | 1995-03-07 | 2009-10-28 | [
"astro-ph"
] | G. Hinshaw, A. J. Banday, C. L. Bennett, K. M. Gorski, and A. Kogut |
astro-ph/9503030 | Dynamical Modeling of NGC 7252 and the Return of Tidal Material | Motivated by recent neutral hydrogen observations with the VLA, we have
undertaken an investigation into the interaction that produced the well known
merger remnant NGC 7252. Through fully self-consistent N-body simulations, we
are able to reproduce the kinematic character of the HI observations quite
well, including t... | 1995-03-07 | 2016-08-30 | [
"astro-ph"
] | John Hibbard (U Hawaii) and Chris Mihos (UC Santa Cruz) |
astro-ph/9503031 | OY Car During Normal Outburst: Balmer Emission From The Red Star And The
Gas Stream | We present observations of OY Car, obtained with the Anglo-Australian
Telescope, during a normal outburst in August 1991. Two sinusoidal components
are resolved in the H$\beta$ trailed spectra and we determine the location of
the narrow component to be on the secondary star with a maximum contributed
flux of ~2.5 per c... | 1995-03-07 | 2016-08-30 | [
"astro-ph"
] | E.T. Harlaftis, T.R. Marsh |
astro-ph/9503032 | The central bar in M94 | Visual, NIR, and H_alpha surface photometry of the oval disk galaxy M94 (NGC
4736) was performed to study the distribution of mass in old stars and the
distribution of the warm emission line gas. The radial profile of the inner
stellar disk is steeper than exponential and displays twisted and deformed
isophotes. Dust i... | 1995-03-07 | 2016-08-30 | [
"astro-ph"
] | C.Moellenhoff, M.Matthias and O.E. Gerhard |
astro-ph/9503028 | SPECTROPHOTOMETRIC INDICES AND METAL CONTENT OF GALACTIC GLOBULAR
CLUSTERS | Spectrophotometric indices for $18$ Galactic globular clusters, obtained from
CCD observations and careful reductions, were used to determine reliable
calibrations on metallicity $[Fe/H]$. The indices were measured in the
bandpasses adopted by Burnstein et al. (\cite{BFGK84}). Adding other
observations of Burnstein et ... | 1995-03-06 | 2016-08-30 | [
"astro-ph"
] | S. Covino, S. Galletti and L.E. Pasinetti (Dip. di Fisica, Univ. di
Milano) |
astro-ph/9503029 | Hard X-ray emission from extragalactic IRAS 12um sources: constraints on
the unified AGN model and the synthesis of the X-ray background | We analyze the $2-10$~keV X-ray emission of complete samples of AGN and
galaxies selected at 12$\mu$m and recently compiled by Rush, Malkan \&
Spinoglio (1993). As a necessary complement we also study the IR emissivity of
the largest sample of hard X--ray selected AGN (Grossan 1992). Our purposes are
to probe the unifi... | 1995-03-06 | 2016-08-30 | [
"astro-ph"
] | X. Barcons, A. Franceschini, G. De Zotti, L. Danese, T. Miyaji |
astro-ph/9503025 | Self-Similar Evolution of Cosmological Density Fluctuations | The gravitational evolution of scale free initial spectra $P(k)\propto k^n$
in an Einstein-de Sitter universe is widely believed to be self-similar for
$-3<n<4$. However, for $-3<n<-1$ the existence of self-similar scaling has not
been adequately demonstrated. Here we investigate the possible breaking of
self-similar s... | 1995-03-06 | 2009-10-28 | [
"astro-ph"
] | Bhuvnesh Jain and Edmund Bertschinger |
astro-ph/9503026 | THREE-DIMENSIONAL HYDRODYNAMIC BONDI-HOYLE ACCRETION. IV. SPECIFIC HEAT
RATIO 4/3. | We investigate the hydrodynamics of three-dimensional classical Bondi-Hoyle
accretion. A totally absorbing sphere of different sizes (1, 0.1 and 0.02
accretion radii) exerts gravity on and moves at different Mach numbers (0.6,
1.4, 3.0 and 10) relative to a homogeneous and slightly perturbed medium, which
is taken to b... | 1995-03-06 | 2011-05-23 | [
"astro-ph"
] | M. Ruffert (Max-Planck-Institut fuer Astrophysik) |
astro-ph/9503027 | COALESCING NEUTRON STARS AS GAMMA RAY BURSTERS ? | We investigate the dynamics and evolution of coalescing neutron stars. The
three-dimensional Newtonian equations of hydrodynamics are integrated by the
`Piecewise Parabolic Method' However, we do include the effects of the emission
of gravitational waves on the hydrodynamics. The properties of neutron star
matter are d... | 1995-03-06 | 2016-08-30 | [
"astro-ph"
] | M. Ruffert, H.-Th. Janka, W. Keil, (Max-Planck-Institut fuer
Astrophysik) and G. Schaefer (MPG-Arbeitsgruppe Gravitationstheorie) |
astro-ph/9503024 | Multi-Frequency Monitoring of the Seyfert 1 Galaxy NGC~4593 II: a Small,
Compact Nucleus ? | We discuss the results of a campaign to monitor spectral variations in the
low-luminosity Seyfert~1 galaxy NGC~4593, at X-rays, ultraviolet, optical and
near IR frequencies. The observations and data analysis have been described in
a companion paper (Santos-Lle\'o et al. 1994; Paper~1). The active nucleus in
this galax... | 1995-03-06 | 2015-06-24 | [
"astro-ph"
] | M. Santos-Lleo, J. Clavel, P. Barr, I.S. Glass, D. Pelat, B.M.
Peterson, G. Reichert |
astro-ph/9503022 | On the Dynamics of the Sagittarius Dwarf Galaxy | We use numerical simulations to test the feasibility of the suggestion by
Ibata et al. (1994) that the excess population of stars which they discovered
in the Sagittarius region may be the disrupted remains of a dwarf spheroidal
galaxy. We find that a Fornax-like model for the pre-disruption system can
indeed reproduce... | 1995-03-05 | 2016-06-08 | [
"astro-ph"
] | H. Velazquez and S.D.M. White |
astro-ph/9503021 | SEARCH FOR VERY LOW MASS OBJECTS IN THE GALACTIC HALO | We present results from a search for gravitational microlensing of stars in
the Large Magellanic Cloud by low mass objects in the Galactic Halo. The search
uses the CCD light curves of about 82,000 stars with up to 46 measurements per
night over a period of 10 months. No light curve exhibits a form that is
consistent w... | 1995-03-05 | 2011-05-23 | [
"astro-ph"
] | EROS collaboration: E. Aubourg, P. Bareyre, S. Brehin, M. Gros, M.
Lachieze-Rey, B. Laurent, E. Lesquoy, C. Magneville, A. Milsztajn, L.
Moscoso, F. Queinnec, J. Rich, M. Spiro, L. Vigroux, S. Zylberajch, R.
Ansari, F. Cavalier, M. Moniez, J. P. Beaulieu, R. Ferlet, Ph. Grison, A.
Vidal-Madjar, E. Maurice, L. P... |
astro-ph/9503020 | Status of Cosmological Parameters: Can $\Omega=1$? | I discuss the Hubble parameter $H_0$, the age of the universe $t_0$, the
density $\Omega_0$, and the cosmological constant $\Lambda$. To focus the
discussion, I concentrate on the issue of the value of the density $\Omega_0$
in currently popular cosmological models in which most of the dark matter is
cold, especially C... | 1995-03-04 | 2016-08-30 | [
"astro-ph",
"hep-ph"
] | Joel R. Primack |
astro-ph/9503018 | Cluster Abundance from Perturbation Spectra with Broken Scale Invariance | A double inflationary model with enhanced power at large scales --- Broken
Scale Invariant perturbations (BSI) --- leads to a promising scenario for the
formation of large-scale structure. We use high-resolution PM simulations with
a model for the thermodynamic evolution of baryons. Galactic halos are
identified as pea... | 1995-03-03 | 2016-08-30 | [
"astro-ph"
] | Volker Muller |
astro-ph/9503015 | The First Second of a Type-II Supernova: Convection, Accretion, and
Shock Propagation | One- and two-dimensional hydrodynamical simulations of neutrino-driven
supernova explosions are discussed. The simulations cover the phase between the
stagnation of the prompt shock and about one second after core bounce.
Systematic variation of the neutrino fluxes from the neutrino sphere shows that
the explosion ener... | 1995-03-03 | 2016-09-07 | [
"astro-ph"
] | H.-Thomas Janka and Ewald Mueller (Univ of Chicago and
Max-Planck-Institut fuer Astrophysik) |
astro-ph/9503023 | Gravitational redshift in the NGC 4258 disk? | The recent observations of high-velocity maser emissions in NGC 4258 by
Myoshi et al provide strong evidence for a central object of mass 3.6 10**7
solar masses in the nucleus of this galaxy based on a kinematic argument.
However, they should allow an independent determination of the central object
mass via gravitation... | 1995-03-03 | 2016-08-30 | [
"astro-ph"
] | Alain Smette, Konrad Kuijken (Kapteyn Astronomical Institute,
Groningen) |
astro-ph/9503016 | The Orion OB1 Association II. The Orion-Eridanus Bubble | Observations of the interstellar medium in the vicinity of the Orion OB1
association show a cavity filled with hot ionized gas, surrounded by an
expanding shell of neutral hydrogen (the Orion-Eridanus Bubble). In this paper
we examine this cavity and the surrounding bubble with the aid of data from the
Leiden/Dwingeloo... | 1995-03-03 | 2016-08-30 | [
"astro-ph"
] | A.G.A. Brown, D. Hartmann, W.B. Burton (Sterrewacht Leiden, CfA) |
astro-ph/9503019 | THE NEED FOR A PARADIGM SHIFT IN OPTICAL ASTRONOMY: A SOLUTION GIVEN BY
LIQUID MIRRORS AND EXAMPLES OF THEIR APPLICATIONS TO COSMOLOGY | I argue that there is a crisis in optical Astronomy due to a paucity of
telescopes and thus the need for a paradigm shift in telescope technology.
Large increases in collecting areas and observing time/astronomer are only
possible if we forgo the fully steerable multipurpose telescope with a glass
primary mirror that h... | 1995-03-03 | 2007-05-23 | [
"astro-ph"
] | E.F. Borra |
astro-ph/9503017 | The Hot Big Bang and Beyond | The hot big-bang cosmology provides a reliable accounting of the Universe
from about $10^{-2}\sec$ after the bang until the present, as well as a robust
framework for speculating back to times as early as $10^{-43}\sec$. Cosmology
faces a number of important challenges; foremost among them are determining the
quantity ... | 1995-03-03 | 2014-10-13 | [
"astro-ph",
"hep-ph"
] | Michael S. Turner (Univ. Chicago/Fermilab) |
astro-ph/9503010 | COMPARISON OF N-BODY SIMULATIONS TO STATISTICAL OBSERVATIONS OF GALAXY
PAIRS | N-body simulations were conducted of pairs of galaxies with a 3:1 mass ratio
on parabolic orbits, in order to quantify the effect of dynamical friction. The
effects of varying the ratio of the dark matter halo size to the distance of
closest approach were explored. Once the dark matter halos are fully
overlapping, the ... | 1995-03-02 | 2016-08-30 | [
"astro-ph"
] | Roger E. Bartlett and Jane C. Charlton |
astro-ph/9503013 | ROSAT observations of the galaxy group AWM7 | We present results of ROSAT/PSPC and HRI observations of the AWM7 group of
galaxies, which is a poor galaxy cluster and forms part of the Perseus-Pisces
filament. The X-ray emission originates from intracluster gas at temperatures
of 1.7 to 4.5 keV. The cluster obviously is elliptical with a position angle
perpendicula... | 1995-03-02 | 2016-08-30 | [
"astro-ph"
] | Doris M. Neumann & Hans Boehringer |
astro-ph/9503011 | Weak Lensing by Large Scale Structure in Open, Flat, and Closed
Universes | Weak lensing is the distortion (polarization) of images of distant objects,
such as high redshift galaxies, by gravitational fields in the limit where the
distortion is small. Gravitational potential fluctuations due to large scale
structure cause correlated distortions of the images of high redshift galaxies.
These di... | 1995-03-02 | 2015-06-24 | [
"astro-ph"
] | Jens Verner Villumsen (Max Planck Institut fuer Astrophysik, Garching
bei Muenchen, Germany) |
astro-ph/9503014 | TOPOLOGICAL DEFECTS AND HIGHEST ENERGY COSMIC AND GAMMA RAYS | In this paper we review the hypothesis that a considerable part of the cosmic
ray flux observed above about $10^{19}\eV$ may be produced by decaying or
annihilating topological defects left over from phase transitions in the early
universe at grand unification energy scales ($\approx10^{16}\GeV$). Possible
signatures o... | 1995-03-02 | 2010-11-01 | [
"astro-ph"
] | G.Sigl |
astro-ph/9503012 | ROSAT HRI Observations of the Crab Pulsar: An Improved Temperature upper
limit for PSR 0531+21 | ROSAT HRI observations have been used to determine an upper limit of the Crab
pulsar surface temperature from the off-pulse count rate. For a neutron star
mass of 1.4 \Mo and a radius of 10 km as well as the standard distance and
interstellar column density, the redshifted temperature upper limit is\/
$T_s^\infty \le 1... | 1995-03-02 | 2016-08-30 | [
"astro-ph"
] | W. Becker and B. Aschenbach (Max-Planck-Institut f\"ur
extraterrestrische Physik, Garching, Germany) |
astro-ph/9503006 | TYPE Ib/c SUPERNOVAE AND THEIR RELATION TO BINARY STARS | The present understanding of type Ib/c supernovae and their connection to
interacting binaries is reviewed. The problems of the classification and the
lack of well-observed events exclude direct inference of progenitor
characteristics. The absence of hydrogen lines in the observed spectrum,
nevertheless, requires restr... | 1995-03-01 | 2016-08-30 | [
"astro-ph"
] | Bruno Leibundgut |
astro-ph/9503005 | New results on the Gunn-Peterson Effect at High Redshift | Attempts to measure the optical depth due to a diffuse intergalactic medium
(IGM) in the spectra of high redshift quasars (GP test) within the ESO key
program on the intergalactic medium are reviewed. It is shown that there is no
evidence for any Gunn-Peterson effect up to the highest redshifts observable in
quasar spe... | 1995-03-01 | 2016-08-30 | [
"astro-ph"
] | E. Giallongo, S. D'Odorico, A. Fontana, S. Savaglio, S. Cristiani, P.
Molaro |
astro-ph/9503007 | COSMOLOGICAL EVOLUTION OF EXTRAGALACTIC SOURCES IN THE INFRARED AND
CONTRIBUTIONS TO THE BACKGROUND RADIATION | Infrared surveys provide essential insights on galaxy evolution. If near-IR
studies suggest mild evolution of stellar populations with cosmic time,
indications of a substantial evolution have been seen in the far-IR, although
the available information is largely insufficient to delineate precise
evolutionary properties... | 1995-03-01 | 2016-08-30 | [
"astro-ph"
] | G. DeZotti, A. Franceschini, P. Mazzei, L. Granato, L. Danese |
astro-ph/9503004 | The Primordial Perturbation Spectrum and Large Scale Structure | Observational constraints on standard CDM spectra and perturbation spectra
with broken scale invariance are discussed. | 1995-03-01 | 2016-08-30 | [
"astro-ph"
] | Stefan Gottloeber (Astrophysical Institute Potsdam) |
astro-ph/9503008 | An observational test of common-envelope evolution | By analysing and modelling the change in the abundance ratio of
$^{12}$C/$^{13}$C and $^{16}$O/$^{17}$O on the surface of the lower mass star
of a binary during the common-envelope (CE) phase of evolution, we propose a
simple observational test of the CE scenario. The test is based on the infrared
measurement of either... | 1995-03-01 | 2016-06-08 | [
"astro-ph"
] | M. J. Sarna, V. S. Dhillon, T. R. Marsh, and P. B. Marks |
astro-ph/9503009 | Absolute-Magnitude Calibration for W~UMa-type Systems. II. Influence of
Metallicity | A modification to the absolute magnitude calibration for W~UMa-type systems,
taking into account differences in metal abundances, is derived on the basis of
contact binary systems recently discovered in metal-poor clusters. A
preliminary estimate of the magnitude of the metallicity-dependent term for the
$(B-V)$-based ... | 1995-03-01 | 2016-08-30 | [
"astro-ph"
] | Slavek Rucinski |
astro-ph/9503002 | The Two--Point Correlation Function and the Size of Voids | Under the assumption of a void-filled Universe we investigate if the
characteristic scale of voids can be determined from existing surveys. We use
the Voronoi tessellation to create mock surveys and study the properties of the
first zero-crossing of the two-point correlation function for various survey
geometries. Our ... | 1995-03-01 | 2015-06-24 | [
"astro-ph"
] | Dalia S. Goldwirth, Luiz Nicolaci da Costa and Rien Van de Weygaert |
astro-ph/9503001 | AUTOMATED MORPHOLOGICAL CLASSIFICATION OF APM GALAXIES BY SUPERVISED
ARTIFICIAL NEURAL NETWORKS | We train Artificial Neural Networks to classify galaxies based solely on the
morphology of the galaxy images as they appear on blue survey plates. The
images are reduced and morphological features such as bulge size and the number
of arms are extracted, all in a fully automated manner. The galaxy sample was
first class... | 1995-03-01 | 2015-06-24 | [
"astro-ph"
] | A. Naim, O. Lahav, L. Sodre Jr. and M. C. Storrie-Lombardi |
astro-ph/9503003 | WRAY 977 (GX301-2): A HYPERGIANT WITH PULSAR COMPANION | Wray 977, the B supergiant companion of the X-ray pulsar GX301-2, should be
classified as B1~Ia+, based on a comparison of its optical spectrum to that of
zeta1 Sco, a well-known B hypergiant and ONE OF THE BRIGHTEST STARS IN THE
GALAXY. The classification of Wray 977 as a hypergiant results in a new
distance determina... | 1995-03-01 | 2016-08-30 | [
"astro-ph"
] | L. Kaper, H.J.G.L.M. Lamers, E. Ruymaekers, E.P.J. van den Heuvel and
E.J. Zuiderwijk |
astro-ph/9502105 | THE ORBITAL ECCENTRICITIES OF BINARY MILLISECOND PULSARS IN GLOBULAR
CLUSTERS | Low-mass binary millisecond pulsars (LMBPs) are born with very small orbital
eccentricities, typically of order $e_i\sim10^{-6}$--$10^{-3}$. In globular
clusters, however, higher eccentricities $e_f\gg e_i$ can be induced by
dynamical interactions with passing stars. Here we show that the cross section
for this process... | 1995-02-28 | 2016-08-30 | [
"astro-ph"
] | Frederic A. Rasio and Douglas C. Heggie |
astro-ph/9502104 | Distribution of proper motions in spherical star clusters | Along with data on radial velocities, more and more data on proper motions of
individual stars in globular clusters are becoming available. Their usage was
until now rather limited. It was mostly restricted to determining cluster
membership of individual stars and to determining the spatial velocity of the
cluster. We ... | 1995-02-28 | 2016-08-30 | [
"astro-ph"
] | M. Wybo and H. Dejonghe |
astro-ph/9502106 | ON BLUE STRAGGLER FORMATION BY DIRECT COLLISIONS OF MAIN-SEQUENCE STARS | We report the results of new SPH calculations of parabolic collisions between
main-sequence (MS) stars. The stars are assumed to be close to the MS turn-off
point in a globular cluster and are therefore modeled as $n=3$, $\Gamma=5/3$
polytropes. We find that the high degree of central mass concentration in these
stars ... | 1995-02-28 | 2012-08-27 | [
"astro-ph"
] | James C. Lombardi, Jr., Frederic A. Rasio, and Stuart L. Shapiro |
astro-ph/9502103 | TEMPERATURE DISTRIBUTION FUNCTION OF X-RAY CLUSTERS OF GALAXIES IN A
NEUTRINO DOMINATED UNIVERSE | The temperature distribution function (TDF) of X-ray clusters is derived for
different normalizations of the HDM power spectrum in an Omega_0=1 universe
using the statistics of peaks of a random Gaussian field. Concerning cluster
formation only, the neutrino picture appears to be marginally consistent with
observations... | 1995-02-28 | 2010-11-30 | [
"astro-ph"
] | C. Balland and A. Blanchard |
astro-ph/9502101 | The IRAS 1.2 Jy Survey: Redshift Data | We present the redshift data for a survey of galaxies selected from the data
base of the Infrared Astronomical Satellite (IRAS). This survey extends the
1.936 Jy sample of Strauss et al. (1992) from a flux limit of 1.936 Jy at 60
microns to 1.2 Jy. The survey extension consists of 3920 sources in the flux
interval 1.2 ... | 1995-02-27 | 2016-08-30 | [
"astro-ph"
] | Karl Fisher, John Huchra, Michael Strauss, Marc Davis, Amos Yahil, and
David Schlegel |
astro-ph/9502100 | THE LYMAN-ALPHA FOREST AT LOW REDSHIFT: TRACING THE DARK MATTER
FILAMENTS | We study the distribution of low-redshift Ly$\alpha$ clouds in a CDM model
using numerical simulations including photoionization and cooling of the
baryonic component. The ionizing background is found to be efficient enough to
keep most of the gas warm ($T$~=~1--5~10$^4$~K) and to prevent most of it from
collapsing. In... | 1995-02-27 | 2016-08-30 | [
"astro-ph"
] | Patrick Petitjean, Jan P. M\"ucket and Ron Kates |
astro-ph/9502102 | AGAPE, an experiment to detect MACHO's in the direction of the Andromeda
galaxy | The status of the Agape experiment to detect Machos in the direction of the
andromeda galaxy is presented. | 1995-02-27 | 2016-08-30 | [
"astro-ph"
] | R. Ansari, M. Auri\'ere, P. Baillon, A. Bouquet, G. Coupinot, C.
Coutures, C. Ghesqui\`ere, Y. Giraud-H\'eraud, P. Gondolo, J. Hecquet, J.
Kaplan, A.L. Melchior, M. Moniez, J.P. Picat and G. Soucail |
astro-ph/9502099 | X-ray Spectrum of the Black Hole Candidate X1755-338 | We report the first detection of a hard power-law tail in the X-ray spectrum
of the black hole candidate (BHC) binary X1755-338, which was observed in 1989
March-September during the TTM Galactic Centre survey. In addition, an
ultrasoft thermal component with a temperature of ~1.1-1.4 keV was also
detected. We demonstr... | 1995-02-27 | 2016-06-08 | [
"astro-ph"
] | H.C. Pan, G.K. Skinner, R.A. Sunyaev, and K.N. Borozdin |
astro-ph/9502095 | Constraints on CDM theories from observations of massive, X-ray luminous
clusters of galaxies at high redshift | During the course of a gravitational lensing survey of distant, X-ray
selected, EMSS clusters of galaxies, we have studied 6 X-ray luminous (Lx >
5x10^44 h_{50}^{-2} erg s^{-1}) clusters at redshifts exceeding z=0.5. All of
these clusters are apparently massive. In addition to their high X-ray
luminosity, two of the cl... | 1995-02-26 | 2016-08-30 | [
"astro-ph"
] | G. A. Luppino and I. M. Gioia (Institute for Astronomy, University of
Hawaii) |
astro-ph/9502096 | The Ages of Elliptical Galaxies in a Merger Model | The tightness of the observed colour-magnitude and Mg$_{2}$- velocity
dispersion relations for elliptical galaxies has often been cited as an
argument against a picture in which ellipticals form by the merging of spiral
disks. A common view is that merging would mix together stars of disparate ages
and produce a large ... | 1995-02-26 | 2015-06-24 | [
"astro-ph"
] | Guinevere Kauffmann |
astro-ph/9502098 | Accretion Disks | This is an introduction to accretion disk theory, with emphasis on aspects
relevant for X-ray Binaries and Cataclysmic Variables. The text corrects some
mistakes in an earlier version, which appeared in 'Lives of Neutron Stars', A.
Alpar, \"U. Kizilo\u glu and J. van Paradijs (eds.), Kluwer, Dordrecht (NATO
ASI series,... | 1995-02-26 | 2016-08-30 | [
"astro-ph"
] | H.C. Spruit (Max Planck Institute for Astrophysics, P.O. Box 1523,
D-85740 Garching, Germany) |
astro-ph/9502097 | TWO-POINT ANGULAR CORRELATION FUNCTION FOR THE GREEN BANK 4.85 GHZ SKY
SURVEY | This paper presents an angular correlation analysis of the Green Bank 4.85
GHz radio catalog (Gregory \& Condon 1991) of 54,579 sources (S \gsim 25 mJy).
The Green Bank catalog is found to be complete to S $\geq$ 35 mJy over
20$^{\circ} \leq \delta < 74^{\circ}$, 0$^h \leq \alpha < 24^h$, and Galactic
latitude $|b| \ge... | 1995-02-26 | 2016-08-30 | [
"astro-ph"
] | Brian L. Kooiman, Jack O. Burns, and Anatoly A. Klypin |
astro-ph/9502094 | AN IMAGING K-BAND SURVEY - II: THE REDSHIFT SURVEY AND GALAXY EVOLUTION
IN THE INFRARED | We present a redshift survey of 124 galaxies, from an imaging $K$-band survey
complete to $K\simeq 17.3$. The optical-to-infrared colours are consistent with
the range expected from synthetic galaxy spectra, although there are some cases
of very red nuclei. Our data show no evidence for evolution of the $K$-band
lumino... | 1995-02-24 | 2015-06-24 | [
"astro-ph"
] | Karl Glazebrook, J. A. Peacock, L. Miller, C. A. Collins |
astro-ph/9502093 | A method for solving the linearized Boltzmann equation for almost
uniformly rotating stellar disks. | We construct analytical phase-space solutions for perturbations of flat disks
by performing a power series expansion for the radius and the velocity
coordinates. We show that this approach translates into an elegant mathematical
formulation which is easy to use for a wide variety of distribution functions,
for as far a... | 1995-02-23 | 2011-05-23 | [
"astro-ph"
] | P. Vauterin and H. Dejonghe |
astro-ph/9502092 | Einstein Observatory evidence for the widespread baryon overdensity in
clusters of galaxies, | We analyse the X-ray surface brightness profiles of 19 moderately distant and
luminous clusters of galaxies observed with the \EINOBS. Our aim is to
determine cluster gas masses out to radii between 1 and $3\Mpc$, and to confirm
the apparent conflict, if $\Omega_0=1$, between the current calculations of the
mean baryon... | 1995-02-22 | 2015-06-24 | [
"astro-ph"
] | D.A. White and A.C. Fabian, |
astro-ph/9502091 | ROTATION CURVES OF 967 SPIRAL GALAXIES | We present the rotation curves (RCs) of 967 spiral galaxies, obtained by
folding and deprojecting the raw optical data by Mathewson et al. (1992). Out
of these, we have identified 80 excellent RCs and 820 fair RCs. The 80
excellent RCs are smooth, symmetric, have negligible rms internal error, extend
to at least the op... | 1995-02-22 | 2016-08-30 | [
"astro-ph"
] | Massimo Persic and Paolo Salucci |
astro-ph/9502089 | The angular correlation hierarchy in the quasilinear regime. | For Gaussian initial conditions the perturbation theory predicts a very
specific hierarchy for the projected matter $p$-point correlation functions. In
the small angle approximation and assuming a power-law spectrum I derive the
exact expressions of the coefficients $s_p$ relating the averaged $p$-order
angular correla... | 1995-02-21 | 2011-05-23 | [
"astro-ph"
] | F. Bernardeau |
astro-ph/9502090 | Gamma-ray Burst Models: General Requirements and Predictions | Whatever the ultimate energy source of gamma-ray bursts turns out to be, the
resulting sequence of physical events is likely to lead to a fairly generic,
almost unavoidable scenario: a relativistic fireball that dissipates its energy
after it has become optically thin. This is expected both for cosmological and
halo di... | 1995-02-21 | 2016-08-30 | [
"astro-ph"
] | P. Meszaros |
astro-ph/9502088 | On the Morphology of Density Perturbations | The morphological distribution of primordial density peaks is assessed.
Previous determinations, those of Peacock & Heavens (1985) and those of Bardeen
et al (1986) have contradictory concluded that there exist a tendency towards
prolate or towards oblate shapes, respectively. By using two methods, the
Hessian and the ... | 1995-02-21 | 2007-05-23 | [
"astro-ph"
] | Alejandro Gonzalez S. and Oscar Martinez (Instituto Nacional de
Astrofisica, Optica y Elect) |
astro-ph/9502087 | Constraints on Self-Interacting Dark Matter | We consider the growth of density perturbations in the presence of
self--interacting dark matter, SIDM, proposed by Carlson, Machacek and Hall
(1992). We determine the range of values for the coupling constant $\lambda$
and the particle mass $m^\prime$, for which the power spectrum lies in the
``allowed" range based on... | 1995-02-20 | 2011-05-12 | [
"astro-ph"
] | Andrew A. de Laix, Robert J. Scherrer and Robert K. Schaefer |
astro-ph/9502085 | TEV GAMMA-RAYS FROM PROTON BLAZARS | Proton acceleration in nearby blazars can be diagnosed measuring their
intense TeV $\gamma$-ray emission. Flux predictions for 1101+384 (Mrk421) and
1219+285 (ON231), both strong EGRET sources (0.1-10 GeV), are obtained from
model spectra of unsaturated synchrotron pair cascades fitted to publicly
available multifreque... | 1995-02-20 | 2009-10-28 | [
"astro-ph"
] | Karl Mannheim |
astro-ph/9502086 | W~UMa-type Systems in the Central Baade Window Discovered in the OGLE
Experiment | 77 W~UMa-type systems to $I=18$ mag in one of the 21 fields of OGLE have been
assessed in terms of utility for extraction of astrophysical information from
time-independent data such as colors, periods, maximum magnitudes, and
variability amplitudes in the final global OGLE catalog which will contain
$>1000$ contact bi... | 1995-02-20 | 2016-08-30 | [
"astro-ph"
] | Slavek M. Rucinski (David Dunlap Observatory, Toronto) |
astro-ph/9502084 | HST Images of the Eclipsing Pulsar B1957+20 | We have obtained images of the eclipsing pulsar binary PSR~B1957+20 using the
Planetary Camera of the Hubble Space Telescope. The high spatial resolution of
this instrument has allowed us to separate the pulsar system from a nearby
background star which has confounded ground-based observations of this system
near optic... | 1995-02-19 | 2016-08-30 | [
"astro-ph"
] | Andrew S. Fruchter, Jay Bookbinder and Charles D. Bailyn |
astro-ph/9502083 | MODELS OF LYMAN-ALPHA CLOUDS | The classic question regarding Lyman-alpha forest clouds is whether they are
confined by the pressure of a hot, diffuse surrounding medium, or by the
gravity of dark matter mini-halos. This paper reviews these basic models for
forest clouds, considering spherical and slab geometries. At high redshift, the
clouds are st... | 1995-02-19 | 2016-08-30 | [
"astro-ph"
] | Jane C. Charlton |
astro-ph/9502082 | Radio Survey of W UMa-type Systems | 12 W~UMa-type systems were observed at 3.6 cm with a goal to compare their
radio luminosities with those of non-contact, rapidly rotating, late-type
stars. Only 3 systems, all of spectral type K, have been detected. The
detections and (low) upper limits for remaining systems confirm the strong
under-luminosity of W~UMa... | 1995-02-17 | 2016-08-30 | [
"astro-ph"
] | Slavek Rucinski, David Dunlap Observatory |
astro-ph/9502081 | Do experiments and astrophysical considerations suggest an inverted
neutrino mass hierarchy? | The recent results from the Los Alamos neutrino oscillation experiment,
together with assumptions of neutrino oscillation solutions for the solar and
atmospheric neutrino deficit problems, may place powerful constraints on any
putative scheme for neutrino masses and mixings. Assuming the validity of these
experiments a... | 1995-02-17 | 2016-08-30 | [
"astro-ph",
"hep-ph"
] | George M. Fuller (University of California, San Diego), Joel R.
Primack (University of California, Santa Cruz), and Yong-Zhong Qian
(Institute for Nuclear Theory, University of Washington) |
astro-ph/9502080 | Matter-enhanced antineutrino flavor transformation and supernova
nucleosynthesis | Matter-enhanced antineutrino flavor transformation between $\bar\nu_e$ and
$\bar\nu_{\mu(\tau)}$ can occur in supernovae if the vacuum masses for these
species satisfy $m_{\bar\nu_e}>m_{\bar\nu_{\mu(\tau)}}$. For $\delta m^2> 1$
eV$^2$, such flavor transformation can affect the electron fraction $Y_e$ in
the neutrino-h... | 1995-02-17 | 2016-08-30 | [
"astro-ph",
"hep-ph"
] | Yong-Zhong Qian (Institute for Nuclear Theory, University of
Washington) and George M. Fuller (University of California, San Diego) |
astro-ph/9502076 | Lyman alpha Emission from High-Redshift Galaxies | We summarise the results of a deep search for Lyman alpha emission from
star-forming regions associated with damped Lyman alpha absorption systems and
conclude that the Lyman alpha luminosity of high redshift galaxies is generally
less than 10^(42) erg/s . We also present a newly discovered case, in the field
of the QS... | 1995-02-16 | 2016-08-30 | [
"astro-ph"
] | Max Pettini (RGO), Richard W. Hunstead (Sydney University) David L.
King (RGO), and Linda J. Smith (University College London) |
astro-ph/9502077 | Element Abundances at High Redshifts: The N/O Ratio in a Primeval Galaxy | The damped Lyman alpha systems seen in the spectra of high redshift QSOs
offer the means to determine element abundances in galaxies observed while
still at an early stage of evolution. Such measurements, which have only
recently come within reach, complement and extend the data provided by studies
of different stellar... | 1995-02-16 | 2016-08-30 | [
"astro-ph"
] | Max Pettini (RGO), Keith Lipman (IoA), and Richard W. Hunstead (Sydney
University) |
astro-ph/9502079 | The density and peculiar velocity fields of nearby galaxies | We review the quantitative science that can be and has been done with
redshift and peculiar velocity surveys of galaxies in the nearby universe.
After a brief background setting the cosmological context for this work, the
first part of this review focuses on redshift surveys. The practical issues of
how redshift survey... | 1995-02-16 | 2016-08-30 | [
"astro-ph"
] | Michael A. Strauss and Jeffrey A. Willick |
astro-ph/9502078 | A COMPARATIVE STUDY OF MORPHOLOGICAL CLASSIFICATIONS OF APM GALAXIES | We investigate the consistency of visual morphological classifications of
galaxies by comparing classifications for 831 galaxies from six independent
observers. The galaxies were classified on laser print copy images or on
computer screen produced from scans with the Automated Plate Measuring (APM)
machine. Classificat... | 1995-02-16 | 2015-06-24 | [
"astro-ph"
] | A. Naim, O. Lahav, R. J. Buta, H. G. Corwin Jr., G. de Vaucouleurs, A.
Dressler, J. P. Huchra, S. van den Bergh, S. Raychaudhury, L. Sodre Jr. and
M. C. Storrie-Lombardi |
astro-ph/9502073 | A new criterion for Bar-Forming Instability in Rapidly Rotating Gaseous
and Stellar Systems. I. Axisymmetric Form | This paper has been removed by arXiv admin because it was an erroneous
duplicate of astro-ph/9411031. | 1995-02-15 | 2009-10-28 | [
"astro-ph"
] | D.M. Christodoulou, I. Shlosman and J.E. Tohline |
astro-ph/9502072 | INTERMEDIATE RESOLUTION SPECTROSCOPY OF THE RADIO GALAXY B2 0902+34 AT
$Z\approx 3.4$ | We have carried out spectroscopic observations of the high redshift
($z\approx 3.4$) radio galaxy 0902+34 at intermediate resolution with the
William Herschel Telescope. The dynamical spectral ranges covered are 4600-5480
\AA and 5920-7680 \AA with resolutions of 5.4 \AA and 9.5 \AA, respectively. We
detect a continuum... | 1995-02-15 | 2016-08-30 | [
"astro-ph"
] | J. M. Martin-Mirones, E. Martinez-Gonzalez, J. I. Gonzalez-Serrano,
and J. L. Sanz |
astro-ph/9502074 | A new criterion for Bar-Forming Instability in Rapidly Rotating Gaseous
and Stellar Systems. II. Nonaxisymmetric Form | We have previously introduced the parameter `alpha' as an indicator of
stability to m=2 nonaxisymmetric modes in rotating, self-gravitating,
axisymmetric, gaseous and stellar systems. This parameter can be written as a
function of the total rotational kinetic energy, the total gravitational
potential energy, and as a f... | 1995-02-15 | 2016-08-30 | [
"astro-ph"
] | D.M. Christodoulou, I. Shlosman and J.E. Tohline |
astro-ph/9502075 | A HEURISTIC REMARK ON THE PERIODIC VARIATION IN THE NUMBER OF SOLAR
NEUTRINOS DETECTED ON EARTH | Four operating neutrino observatories confirm the long standing discrepancy
between detected and predicted solar neutrino flux. Among these four
experiments the Homestake experiment is taking data for almost 25 years. The
reliability of the radiochemical method for detecting solar neutrinos has been
tested recently by ... | 1995-02-15 | 2016-08-30 | [
"astro-ph"
] | H.J. Haubold and A.M. Mathai |
astro-ph/9502069 | The pattern speed of the bar in NGC 936 | We have used the Tremaine-Weinberg method to measure the angular speed of
rotation for the bar in the SB0 galaxy NGC 936. With this technique, the bar's
pattern speed, Omega_p, can be derived from the luminosity and
stellar-kinematic information in long-slit spectral observations taken parallel
to the major axis of the... | 1995-02-14 | 2015-06-24 | [
"astro-ph"
] | Michael R. Merrifield and Konrad Kuijken |
astro-ph/9502071 | GB1508+5714: a radio-loud quasar with z=4.30 and the space density of
high redshift, radio--loud quasars. | We report the discovery of a radio loud quasar with a redshift of 4.30. This
object, which is the first radio selected quasar with a redshift greater than
four, was discovered during an observational investigation into the evolution
of the luminosity function of radio loud quasars. Here we describe results
based on a s... | 1995-02-14 | 2016-06-08 | [
"astro-ph"
] | I. M. Hook, R. G. McMahon, A. R. Patnaik, I. W. A. Browne, P. N.
Wilkinson, M. J. Irwin, C. Hazard |
astro-ph/9502068 | Spectral classification and HR diagram for symbiotic stars in the
galactic bulge | A sample of 45 symbiotic stars observed in the direction of the galactic
bulge are classified in spectral type using TiO $\lambda \lambda 6180, 7100
\AA$ and VO $\lambda \lambda 7865 \AA$ absorption feature indices and visual
comparison. The effective temperatures obtained are used together with K data
from the literat... | 1995-02-14 | 2009-10-28 | [
"astro-ph"
] | G. A. Medina Tanco and J. E. Steiner |
astro-ph/9502070 | INFRARED EMISSION AND DYNAMICS OF OUTFLOWS IN LATE-TYPE STARS | The dynamical structure and infrared emission of winds around late-type stars
are studied in a self-consistent model that couples the equations of motion and
radiative transfer. Both the dynamics and IR spectrum of the solution are fully
characterized by the flux averaged optical depth. Five types of dust grains are
co... | 1995-02-14 | 2016-08-30 | [
"astro-ph"
] | Zeljko Ivezic, Moshe Elitzur |
astro-ph/9502065 | An Eccentric Disk Model for the Nucleus of M31 | The nucleus of M31 may be a thick eccentric disk, composed of stars traveling
on nearly Keplerian orbits around a black hole or other dark compact object.
This hypothesis reproduces most of the features seen in HST photometry of the
center of M31; in particular the bright off-center source P1 is the apoapsis of
the dis... | 1995-02-13 | 2016-08-30 | [
"astro-ph"
] | Scott Tremaine |
astro-ph/9502066 | Genus and spot density in the COBE DMR first year anisotropy maps | A statistical analysis of texture on the {\it COBE}-DMR first year sky maps
based on the genus and spot number is presented. A generalized $\chi^2$
statistic is defined in terms of ``observable'' quantities: the genus and spot
density that would be measured by different cosmic observers. This strategy
together with the... | 1995-02-13 | 2015-06-24 | [
"astro-ph"
] | S. Torres, L. Cayon, E. Martinez-Gonzalez and J.L. Sanz |
astro-ph/9502067 | Generic Evolution Of Deuterium And Helium-3 | The primordial abundances of deuterium and of helium-3, produced during big
bang nucleosynthesis, depend sensitively on the baryon density. Thus, the
observed abundances of D and \he may provide useful ``baryometers'' provided
the evolution from primordial to present (or, presolar nebula) abundances is
understood. Inev... | 1995-02-13 | 2016-08-30 | [
"astro-ph"
] | Gary Steigman and Monica Tosi |
astro-ph/9502064 | EVAPORATION OF QUARK DROPS DURING THE COSMOLOGICAL Q-H TRANSITION | We have carried out a study of the hydrodynamics of disconnected quark
regions during the final stages of the cosmological quark-hadron transition. A
set of relativistic Lagrangian equations is presented for following the
evaporation of a single quark drop and results from the numerical solution of
this are discussed. ... | 1995-02-13 | 2016-08-30 | [
"astro-ph",
"hep-ph"
] | L. Rezzolla, J.C. Miller and O. Pantano |
astro-ph/9502063 | THE GUNN-PETERSON EFFECT FROM UNDERDENSE REGIONS IN A PHOTOIONIZED
INTERGALACTIC MEDIUM | We use the Zel'dovich approximation and another analytical approximation to
calculate the evolution under gravitational instability of the underdense
regions of a photoionized intergalactic medium (IGM). We find that over most of
the spectrum of a quasar, the optical depth to $\lya$ scattering originates
from gas in un... | 1995-02-13 | 2016-08-30 | [
"astro-ph"
] | Andreas Reisenegger and Jordi Miralda-Escude |
astro-ph/9502062 | COLD + HOT AND COLD DARK MATTER COSMOLOGIES: ANALYSIS OF NUMERICAL
SIMULATIONS | We present a series of four simulations of Cold Dark Matter (CDM) and Cold +
Hot Dark Matter (CHDM) cosmologies. We discuss the power spectrum and
correlation functions in real and redshift space, with comparisons to the CfA2
and IRAS redshift data, the pairwise velocity of galaxies, and the distribution
of hot and col... | 1995-02-12 | 2016-08-30 | [
"astro-ph"
] | A.Klypin (NMSU), R.Nolthenius, and J.Primack (UCSC) |
astro-ph/9502060 | The Signatures of Voids and the CMBR | We explore the signature of a cold dark matter compensated void in the quasi
non-linear regime. We find that this void is entirely a cold spot on the
microwave background, in contrast to a non-linear void. On the last scattering
surface(LSS), it appears as either a hot or cold spot depending on where this
surface cuts ... | 1995-02-11 | 2016-08-30 | [
"astro-ph"
] | Sharon L. Vadas |
astro-ph/9502059 | The Double Cluster G185 in M31 | We have identified a small globular cluster in M31 located approximately 4
arcseconds northwest of the M31 globular cluster G185. While several multiple
globular clusters have been observed in the Magellanic Clouds none have been
found in the Galaxy or in M31. We estimate the probability of such a chance
line-of-sight ... | 1995-02-11 | 2009-10-28 | [
"astro-ph"
] | Stephen Holland, Gregory G. Fahlman, & Harvey B. Richer |
astro-ph/9502061 | Magnetically modulated accretion in T Tauri stars | We examine how accretion on to T Tauri stars may be modulated by a
time-dependent `magnetic gate' where the inner edge of the accretion disc is
disrupted by a varying stellar field. We show that magnetic field variations on
time-scales shorter than 10^5 yr can modulate the accretion flow, thus
providing a possible mech... | 1995-02-11 | 2015-06-24 | [
"astro-ph"
] | C.J. Clarke, P.J. Armitage, K.W. Smith and J.E. Pringle |
astro-ph/9502054 | Hubble Parameter in Void Universe | We investigate the distance-redshift relation in the simple void model. As
discussed by Moffat and Tatarski, if the observer stays at the center of the
void, the observed Hubble parameter is not so different from the background
Hubble parameter. However, if the position of observer is off center of the
void, we must co... | 1995-02-10 | 2016-08-30 | [
"astro-ph"
] | Ken-ichi Nakao, Naoteru Gouda, Takeshi Chiba, Satoru Ikeuchi, Takashi
Nakamura and Masaru Shibata |
astro-ph/9502056 | The Large-Scale Distribution of Quasars | We report the investigation of spatial distribution of quasars using two
different methods: the statistical study by means of 2-point correlation
function and direct search for structures such as previously reported Large
Quasar Groups. Having analyzed the combined sample of eight homogeneous quasar
surveys (totalling ... | 1995-02-10 | 2016-08-30 | [
"astro-ph"
] | B.V.Komberg, A.V.Kravtsov, V.N.Lukash (Astro Space Center, Lebedev
Physical Institute, Moscow) |
astro-ph/9502057 | LYMAN $\alpha$ FORESTS AND COOLING OUTFLOW FROM DWARF GALAXIES | We propose that cooling outflows from star-forming dwarf galaxies that are
spatially correlated with but unbound to bright galaxies may account for the
low column QSO Ly$\alpha$ forests, providing an explanation for both the heavy
elements recently detected in them and the large sizes associated with them.
Thus, we sug... | 1995-02-10 | 2016-08-30 | [
"astro-ph"
] | Boqi Wang (The Johns Hopkins University) |
astro-ph/9502058 | Binary Pulsar Shock Emissions as Galactic Gamma-Ray Sources | We address several issues regarding the interpretation of galactic \ggg-ray
sources. We consider powerful pulsars in binaries producing X-ray and gamma-ray
{\it unpulsed} emission from the shock interaction of relativistic pulsar winds
with circumbinary material. Nebular mass outflows from companion stars of
binary pul... | 1995-02-10 | 2016-08-30 | [
"astro-ph"
] | M. Tavani |
astro-ph/9502055 | HOT ACCRETION DISKS WITH ADVECTION | The global structure of optically thin hot accretion disks with radial
advection included has been investigated. We solve the full energy conservation
equation explicitly and construct the radial structure of the disk. It is found
that advection is a real cooling process and that there are two solutions
co-exist for a ... | 1995-02-10 | 2016-08-30 | [
"astro-ph"
] | Xingming Chen |
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