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 |
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astro-ph/9511033 | Star-Formation Knots in IRAS Galaxies | Images of IRAS galaxies with a range of IR properties are examined for bright
knots, both within and outside the galaxy. These are found almost exclusively
in galaxies with steep IR spectra, but over a wide range of IR luminosity, and
usually without strong nuclear activity. In most cases, the knots are likely to
be st... | 1995-11-08 | 2009-10-28 | [
"astro-ph"
] | J.B. Hutchings |
astro-ph/9511032 | Constraints on massive black holes as dark matter candidates using
Galactic globular clusters | This work considers the idea of massive black holes being the constituents of
the Galactic dark matter halo. It constrains the maximum black hole mass to
$\mbh \sil 5 \times 10^4 \msun$ by examining their influence on the population
of globular clusters in our Milky Way. In the adopted halo model, globular
clusters are... | 1995-11-08 | 2015-06-24 | [
"astro-ph"
] | Ralf Klessen and Andreas Burkert |
astro-ph/9511030 | Low Mass Companions to T~Tauri Stars: a Mechanism for Rapid-rise
FU~Orionis Outbursts | We show that outside-in disc instabilities, which can produce rapid-\null
rise FU Orionis outbursts in T~Tauri systems, are a natural consequence of the
existence of protoplanetary protostellar companions. The \pcomp{} would be
formed through gravitational instability on a dynamical timescale ($\sim
10^5\y$), and provi... | 1995-11-08 | 2016-06-08 | [
"astro-ph"
] | Cathie Clarke (IoA), Dave Syer (MPA) |
astro-ph/9511027 | Numerical study of energy diffusion in King models | The energy diffusion coefficients D_n(E) (n=1,2) for a system of equal mass
particles moving self-consistently in an N-body realisation of a King model are
computed from the probability per unit time, P(E, Delta E), that a star with
initial energy E will undergo an energy change Delta E. In turn, P is computed
from the... | 1995-11-07 | 2015-06-24 | [
"astro-ph"
] | Tom Theuns (Oxford University) |
astro-ph/9511025 | Tracing the Dynamics of Disk Galaxies with Optical and IR Surface
Photometry: Color Gradients in M99 | We present optical and IR surface photometry of M99 (NGC 4254) at g, r_S i, J
and K'. We also present a K' image of M51 (NGC 5194) for comparison. Fourier
decomposition of the disk light reveals that the radial distribution of power
depends on wavelength, which in turn implies that the spiral structure traced
in the vi... | 1995-11-07 | 2009-10-28 | [
"astro-ph"
] | Rosa A. Gonzalez and James R. Graham (UC Berkeley) |
astro-ph/9511026 | Metal-rich globular clusters of the Galaxy: morphology of the
helium-burning "clump," and the determination of relative ages through the
"$\Delta V$" method | Morphological aspects of the $V, \bv$ diagram of metal-rich globular clusters
are analyzed, on the basis of stellar evolution models for horizontal-branch
(HB) and red giant branch stars. These have been incorporated into detailed
synthetic HB models, the influence of differential reddening upon which is also
discussed... | 1995-11-07 | 2016-08-30 | [
"astro-ph"
] | M. Catelan and J.A. de Freitas Pacheco |
astro-ph/9511024 | Global HI profiles of spiral galaxies | In this paper we present short HI synthesis observations of 57 galaxies
without HI information in the RC3. These are a by-product of a large survey
with the WSRT of the neutral hydrogen gas in spiral and irregular galaxies.
Global profiles and related quantities are given for the 42 detected galaxies
and upper limits f... | 1995-11-06 | 2007-05-23 | [
"astro-ph"
] | J.J. Kamphuis, D. Sijbring and T.S. van Albada (Kapteyn Astronomical
Institute) |
astro-ph/9511023 | Microlensing of pulsar radiation in the Galactic Center | We investigate the possibility of identifying massive objects (lenses) in the
Galactic Center region (GC) by means of pulsar timing. The well known intensity
change due to microlensing is found to be less important. For typical stellar
masses, the flux magnification can be significant only if the lens passes very
close... | 1995-11-05 | 2016-08-30 | [
"astro-ph"
] | N. Wex, J. Gil, M. Sendyk |
astro-ph/9511022 | Does There Really Exist the Problem of the Dark Matter in Spiral
Galaxies? | A simple model for the dust media describing evolution of the system like
spiral galaxy is considered. In contrast to previous considerations we show
that the initial density fold should be quasi-one-dimensional (bar-like)
instead of disc-like. The disc component of the galaxies appears only during
the evolution. The m... | 1995-11-04 | 2007-05-23 | [
"astro-ph"
] | A.E.Filippov and A.S.Zhedanov (DPTI, Donetsk, Ukraine) |
astro-ph/9511019 | Chemical Abundances in Virgo Spiral Galaxies II: Effects of Cluster
Environment | We present new measurements of chemical abundances in H II regions in spiral
galaxies of the Virgo cluster and a comparison of Virgo galaxies and field
spirals. With these new data there now exist nine Virgo spirals with abundance
measurements for at least four H II regions. Our sample of Virgo galaxies
ranges from H I... | 1995-11-03 | 2009-10-28 | [
"astro-ph"
] | Evan D. Skillman (U.Minn.), Robert C. Kennicutt Jr. (Steward Obs., U.
Arizona), Gregory A. Shields (U. Texas), and Dennis Zaritsky (UCO/Lick Obs.,
UCSC) |
astro-ph/9511017 | The Origin of Extreme Horizontal Branch Stars | Strong mass loss on the red giant branch (RGB) can result in the formation of
extreme horizontal branch (EHB) stars. The EHB stars spend most of their He
core and shell burning phase at high temperatures and produce copious
ultraviolet flux. They have very small hydrogen envelopes and occupy a small
range in mass. We h... | 1995-11-03 | 2016-02-17 | [
"astro-ph"
] | Noella Lambert d'Cruz (U. Va), Ben Dorman (U. Va/NASA-GSFC), Robert T.
Rood, and Robert W. O'Connell |
astro-ph/9511018 | Merger trees and the multiplicity function of halos | We present a new method for calculating the merger history of matter halos in
hierarchical clustering cosmologies. The linear density field is smoothed on a
range of scales, these are then ordered in decreasing density and a merger tree
constructed. The method is similar in many respects to the block model of Cole
\& K... | 1995-11-03 | 2015-06-24 | [
"astro-ph"
] | Domingos D. C. Rodrigues and Peter A. Thomas |
astro-ph/9511021 | Triaxial Galaxies with Cusps | We have constructed fully self-consistent models of triaxial galaxies with
central density cusps. The triaxial generalizations of Dehnen's spherical
models are presented, which have densities that vary as 1/r^gamma near the
center and 1/r^4 at large radii. We computed libraries of about 7000 orbits in
each of two triax... | 1995-11-03 | 2009-10-28 | [
"astro-ph"
] | David Merritt and Tema Fridman (Rutgers) |
astro-ph/9511020 | Neutral hydrogen in the nearby galaxies Dwingeloo 1 and Dwingeloo 2 | We present observations made with the Westerbork Synthesis Radio Telescope of
HI emission from Dwingeloo 1, a nearby barred spiral discovered during the
Dwingeloo Obscured Galaxies Survey for galaxies hidden in the Zone of
Avoidance, and of Dwingeloo 2, a small galaxy discovered in the beam of these
WSRT observations. ... | 1995-11-03 | 2007-05-23 | [
"astro-ph"
] | W.B. Burton (Leiden Observatory) M.A.W. Verheijen (Kapteyn
Astronomical Institute) R.C. Kraan-Korteweg (Observatoire de Paris) P.A.
Henning (University of New Mexico) |
astro-ph/9511014 | Keck Spectroscopy and HST Imaging of Field Galaxies at Moderate Redshift | We present 18 spectra, obtained with the Keck 10m telescope, of faint field
galaxies (19 $<$ I $<$ 22, 0.2 $<$ z $<$ 0.84) previously imaged by {\it HST's}
WFPC2. Though small, our sample appears to be representative of field spirals
with a magnitude--limit of I $\le$ 22. Combining the results from the spectral
and ima... | 1995-11-02 | 2009-10-28 | [
"astro-ph"
] | Duncan A. Forbes, Andrew C. Phillips, David C. Koo and Garth D.
Illingworth (Lick Observatory) |
astro-ph/9511012 | The Confluent System Formalism: II. The Growth History of Objects | With the present paper we conclude the presentation of a semianalytical model
of hierarchical clustering of bound virialized objects formed by gravitational
instability from a random Gaussian field of density fluctuations. In paper I,
we introduced the basic tool, the so-called ``confluent system'' formalism,
able to f... | 1995-11-02 | 2009-10-28 | [
"astro-ph"
] | Alberto Manrique and Eduard Salvador-Sole (University of Barcelona) |
astro-ph/9511016 | The Structure of CDM Halos | High resolution N-body simulations show that the density profiles of dark
matter halos formed in the standard CDM cosmogony can be fit accurately by
scaling a simple ``universal'' profile. Regardless of their mass, halos are
nearly isothermal over a large range in radius, but significantly shallower
than $r^{-2}$ near ... | 1995-11-02 | 2007-05-23 | [
"astro-ph"
] | Julio F. Navarro (Steward Observatory, University of Arizona) |
astro-ph/9511009 | The large scale structure of the soft X-ray background. I: Clusters of
galaxies | Large-scale fluctuations of the X-ray background are investigated using the
ROSAT All-Sky Survey. The autocorrelation function of the extragalactic
background at 1 keV is determined at separations 0.1 - 40 deg. We detect a
significant signal for separations < 6 deg, which is larger than previous upper
limits. We analys... | 1995-11-02 | 2007-05-23 | [
"astro-ph"
] | Andrzej M. Soltan, Guenther Hasinger, Roland Egger, Steve Snowden and
Joachim Truemper (MPE-Garching, Copernicus Center-Warsaw,
NASA/GSFC-Greenbelt) |
astro-ph/9511013 | The Lyman Alpha Forest from Gravitational Collapse in the CDM+Lambda
Model | We model the $\lya$ forest in a spatially flat, CDM model with $\Omega=0.4$,
with an Eulerian hydrodynamic simulation, and find that the intergalactic,
photoionized gas collapses into sheet-like and filamentary structures which
produce absorption lines like those observed in the $\lya$ forest. A typical
filament is $\s... | 1995-11-02 | 2009-10-28 | [
"astro-ph"
] | Jordi Miralda-Escude, Renyue Cen, Jeremiah P. Ostriker, Michael Rauch |
astro-ph/9511010 | The number, luminosity, and mass density of spiral galaxies as a
function of surface brightness | I give analytic expressions for the relative number, luminosity, and mass
density of disc galaxies as a function of surface brightness. These surface
brightness distributions are asymmetric, with long tails to lower surface
brightnesses. This asymmetry induces systematic errors in most determinations
of the galaxy lumi... | 1995-11-02 | 2015-06-24 | [
"astro-ph"
] | Stacy McGaugh |
astro-ph/9511011 | The Palomar Distant Cluster Survey: I. The Cluster Catalog | We present an optical/near IR selected catalog of 79 clusters distributed
over an area of 5.1~square~degrees. The catalog was constructed from images
obtained with the 4-Shooter CCD mosaic camera on the Hale 5m telescope
operating in ``scan" mode. The survey, hereafter known as the Palomar Distant
Cluster Survey (PDCS)... | 1995-11-02 | 2008-11-26 | [
"astro-ph"
] | M. Postman (STScI), L. M. Lubin (OCIW), J. E. Gunn (Princeton), J. B.
Oke (DAO), J. G. Hoessel (U. Wisconsin), D. P. Schneider (PSU), J. A.
Christensen (STScI) |
astro-ph/9511015 | Hubble Space Telescope Observations of the Lensing Cluster Abell 2218 | We present a striking new Hubble Space Telescope (HST) observation of the
rich cluster Abell 2218 taken with the Wide-Field and Planetary Camera (WFPC2).
HST's restored image quality reveals a sizeable number of
gravitationally-lensed features in this cluster, significantly more than had
been identified using ground-ba... | 1995-11-02 | 2009-10-28 | [
"astro-ph"
] | J.-P. Kneib, R.S. Ellis, I. Smail, W.J. Couch & R.M. Sharples |
astro-ph/9511008 | A Test of Gamma Ray Burst Recurrence in the BATSE 3B Data Set | We analyse the BATSE 3B catalog using the pair-matching statistic. This
statistic counts only the burst pairs which may have originated from the same
source, so it is less likely to yield false detections of ``repeating bursts"
than the nearest neighbor and correlation function statistics. Even in the
ideal case when r... | 1995-11-02 | 2007-05-23 | [
"astro-ph"
] | David P. Bennett and Sun Hong Rhie |
astro-ph/9511007 | The Cluster Abundance in Flat and Open Cosmologies | We use the galaxy cluster X-ray temperature distribution function to
constrain the amplitude of the power spectrum of density inhomogeneities on the
scale corresponding to clusters. We carry out the analysis for critical density
universes, for low density universes with a cosmological constant included to
restore spati... | 1995-11-01 | 2015-06-24 | [
"astro-ph"
] | Pedro T P Viana and Andrew R Liddle |
astro-ph/9510160 | The Formation of Dwarf Galaxies in Tidal Debris: A Study of the Compact
Group Environment | From R-band images of 42 Hickson compact groups, we present a sample of 47
candidate dwarf galaxies that are associated with the tidal tails and arms in
the groups. The candidates, found in 15 tidal features, have R magnitudes and
masses (for M/L = 1) in the ranges -16.5 < M_R - 5 log h_{75} < -11.5 and
2x10^6 M_{\odot... | 1995-11-01 | 2009-10-28 | [
"astro-ph"
] | Sally D. Hunsberger (PSU), Jane C. Charlton (PSU), and Dennis Zaritsky
(UCO/Lick Obs., UCSC) |
astro-ph/9511006 | Reverberation Mapping and the Disk Wind Model of the Broad Line Region | Using the disk wind model of Murray et al. (1995), we calculate line profiles
and frequency-resolved response functions for broad line emission from the
surface of an accretion disk in an AGN in the presence of a radiatively driven
wind. We find that the combined effects of the shears in the wind and in the
disk itself... | 1995-11-01 | 2009-10-28 | [
"astro-ph"
] | J. Chiang and N. Murray (CITA) |
astro-ph/9511001 | Mergers and the Formation of Disk Galaxies in Hierarchically Clustering
Universes | New simulations are presented which investigate the formation of smaller
groups of galaxies in a CDM like universe. The simulations follow the evolution
of dark matter and gas and are performed with an SPH code adapted for the
special-purpose hardware GRAPE. The mass resolution in the baryonic component
is 5 10^6 Msol,... | 1995-11-01 | 2016-08-30 | [
"astro-ph"
] | Matthias Steinmetz |
astro-ph/9511005 | The Optical Redshift Survey II: Derivation of the Luminosity and
Diameter Functions and of the Density Field | We quantify the effects of Galactic extinction on the derived luminosity and
diameter functions and on the density field of a redshift sample. Galaxy
magnitudes are more affected by extinction than are diameters, although the
effect on the latter is more variable from galaxy to galaxy, making it more
difficult to quant... | 1995-11-01 | 2009-10-28 | [
"astro-ph"
] | Basilio X. Santiago, Michael A. Strauss, Ofer Lahav, Marc Davis, Alan
Dressler and John Huchra |
astro-ph/9511004 | Rotating Winds from Accretion Disks in Cataclysmic Variables: Eclipse
Modeling of V347 Puppis | We study the eclipsing nova-like variable V347 Pup by matching its UV
emission line profiles in and out of eclipse to synthetic lines using a 3D
kinematic and radiation transfer model. Our results support the accretion disk
origin of winds in non-magnetic CVs as opposite to the WD origin. Our main
point concerns the im... | 1995-11-01 | 2009-10-28 | [
"astro-ph"
] | Isaac Shlosman, Peter Vitello, Christopher W. Mauche |
astro-ph/9511002 | Redshift dependence of clustering in numerical simulations | High resolution $N$-body simulations for variants of the CDM model are used
to derive the redshift dependence of galaxy formation and of galaxy correlation
functions. The reconstructed power spectra and clustering properties provide a
sensible test for the underlying power spectra. We compare our simulations with
new r... | 1995-11-01 | 2007-05-23 | [
"astro-ph"
] | Volker Mueller |
astro-ph/9511003 | The HI Content of Spirals. I. Field-Galaxy HI Mass Functions and HI
Mass-Optical Size Regression | A standard parametric maximum-likelihood technique is used to determine both
the probability distribution over total HI mass $M_{\rm HI}$ and the regression
of this quantity on the linear optical diameter $D_{\rm o}$ for field giant
spirals (Sa-Sc) from a complete HI-flux-limited data set of these objects.
Gaussian and... | 1995-11-01 | 2009-10-28 | [
"astro-ph"
] | Jos\'e M. Solanes, Riccardo Giovanelli, and Martha P. Haynes |
astro-ph/9510161 | Pixel Lensing Experiment toward the M31 Bulge | I demonstrate that one can detect pixel gravitational microlensing events at
the rate $\sim 180\ {\rm events}\ {\rm yr}^{-1}$ and that some fraction of
events ($\sim 15$) will be good enough to measure time scales at the $20\%$
level if the experiment is carried out toward the central M31 bulge region with
a dedicated ... | 1995-11-01 | 2009-10-28 | [
"astro-ph"
] | Cheongho Han |
astro-ph/9510153 | Energetics of star-disc encounters in the non-linear regime | We investigate the response of a circumstellar accretion disc to the fly-by
of a perturbing mass on a parabolic orbit. The energy and angular momentum
transferred during the encounter are calculated using a reduced three-body
method. In almost all close encounters the energy and angular momentum transfer
is dominated b... | 1995-10-31 | 2015-06-24 | [
"astro-ph"
] | S.M. Hall, C.J. Clarke, J.E. Pringle |
astro-ph/9510157 | Testing the Strong Equivalence Principle with Mars Ranging Data | The year 1996 will mark the initiation of a number of new space missions to
the planet Mars from which we expect to obtain a rich set of data, including
spacecraft radio tracking data. Anticipating these events, we have analyzed the
feasibility of testing a violation of the strong equivalence principle (SEP)
with Earth... | 1995-10-31 | 2007-05-23 | [
"astro-ph",
"gr-qc"
] | John D. Anderson, Mark Gross, Eunice L. Lau, Kenneth L. Nordtvedt and
Slava G. Turyshev |
astro-ph/9510154 | Hydrodynamic Simulations of Galaxy Formation. II. Photoionization and
the Formation of Low Mass Galaxies | Photoionization by the high-redshift ultraviolet radiation background heats
low density gas before it falls into dark matter potential wells, and it
eliminates the neutral hydrogen and singly ionized helium that dominate cooling
of primordial gas at temperatures of $10^4-10^5$K. We investigate the influence
of photoion... | 1995-10-31 | 2011-08-17 | [
"astro-ph"
] | Anne A. Thoul and David H. Weinberg |
astro-ph/9510155 | The Mass-to-Light Ratios of the Draco and Ursa Minor Dwarf Spheroidal
Galaxies. II. The Binary Population and Its Effect in the Measured Velocity
Dispersions of Dwarf Spheroidal Galaxies | We use a large set of radial velocities in the Ursa Minor and Draco dwarf
spheroidal galaxies to search for binary stars and to infer the binary
frequency. Of the 118 stars in our sample with multiple observations, six are
velocity variables with $\chi^2$ probabilities below 0.001. We use Monte Carlo
simulations that m... | 1995-10-31 | 2009-10-28 | [
"astro-ph"
] | E. Olszewski (Steward Obs), C. Pryor (Physics Dept, Rutgers) and T.
Armandroff (NOAO/KPNO) |
astro-ph/9510158 | Black Holes, Galaxy Formation and the Large-scale Structure of the
Universe | A new model for the formation of active galaxies is described. A key feature
of this model is the idea that the birth of black holes in the centers of
supergiant galaxies is strongly influenced by the large-scale distribution of
matter in the universe. This conjecture can successfully explain two observed
phenomena: th... | 1995-10-31 | 2007-05-23 | [
"astro-ph",
"gr-qc"
] | Michael J. West |
astro-ph/9510159 | Low Dimensional Dynamics in a Pulsating Star | We report the discovery of a low dimensional dynamical system in a 5.5 hr
Hubble Space Telescope High Speed Photometer observation of a rapidly
oscillating star. The topological description of the phase space orbits is
given, as well as a dynamical model which describes the results. This model
should motivate theorists... | 1995-10-31 | 2008-02-03 | [
"astro-ph",
"chao-dyn",
"nlin.CD"
] | G. B. Mindlin, P. T. Boyd, J. L. Caaminos, J. A. Nunez |
astro-ph/9510156 | A Morphological Indicator for Comparing Simulated Cosmological Scenarios
with Observations | We propose a morphological multi-scale analysis of large-scale structures
obtained by computer simulations and by observations. Structures are obtained
at different scales by applying a wavelet transform on the observed and
simulated data. Application of a segmentation algorithm allows a quantitative
morphological desc... | 1995-10-31 | 2007-05-23 | [
"astro-ph"
] | E. Lega(1), A. Bijaoui (1), J.-M. Alimi(2) and H. Scholl (1) ((1)
Observatoire de la Cote d'Azur, Nice, France, (2) LAEC, Observatoire de
Meudon, France) |
astro-ph/9510151 | Analysis of Galaxy Morphology and Evolution using the Pointwise
Dimension | In this paper we explore the application of the pointwise dimension (PD)
analysis as a large-scale structure descriptor to the RC3 catalog of galaxies
(de Vaucouleurs et al. 1991). This technique, which originated in the field of
fractal geometry (Mandelbrot 1983) and found many applications in non-linear
dynamics, is ... | 1995-10-30 | 2009-10-28 | [
"astro-ph"
] | Jason S. Best, Jane C. Charlton (Penn State University), Gottfried
Mayer-Kress (UIUC) |
astro-ph/9510150 | Dynamical Modelling of Hot Stellar Systems | Estimation of the distribution function f and potential Phi of hot stellar
systems from kinematical data is discussed. When the functional forms of f and
Phi are not specified a priori, accurate estimation of either function requires
very high quality data: either accurate ``line profiles'' at radii extending
well beyo... | 1995-10-30 | 2007-05-23 | [
"astro-ph"
] | David Merritt (Rutgers University) |
astro-ph/9510149 | Modelling Accretion in Protobinary Systems | A method for following fragmentation simulations further in time using
smoothed particle hydrodynamics (SPH) is presented. In a normal SPH simulation
of the collapse and fragmentation of a molecular cloud, high-density regions of
gas that form protostars are represented by many particles with small
separations. These h... | 1995-10-30 | 2015-06-24 | [
"astro-ph"
] | M.R. Bate, I.A. Bonnell, N.M. Price |
astro-ph/9510152 | The Influence of Binary Stars on Dwarf Spheroidal Galaxy Kinematics | We have completed a Monte-Carlo simulation to estimate the effect of binary
star orbits on the measured velocity dispersion in dwarf spheroidal galaxies.
This paper analyses previous attempts at this calculation, and explains the
simulations which were performed with mass, period and ellipticity
distributions similar t... | 1995-10-30 | 2015-06-24 | [
"astro-ph"
] | J.C. Hargreaves (IoA Cambridge), G. Gilmore (IoA), J.D. Annan |
astro-ph/9510148 | Coronal Gamma Ray Bursts as the sources of Ultra High Energy Cosmic
Rays? | I consider the possibility that Ultra High Energy Cosmic Rays are accelerated
in Gamma Ray Bursts located in the Galactic corona, thus circumventing the
problem raised by Greisen--Zatsepin--Kuz'min cutoff. The acceleration of UHECRs
could occur in the pulsars which, in the coronal GRB model, produce them: the
same para... | 1995-10-30 | 2016-06-08 | [
"astro-ph"
] | Mario Vietri (Osservatorio Astronomico di Roma) |
astro-ph/9510147 | The Structure of Dark Matter Haloes in Hierarchical Clustering Models | We use a set of large cosmological N-body simulations to study the internal
structure of dark matter haloes which form in scale-free models. We find that
the radius r_178 corresponding to a mean interior overdensity of 178 accurately
delineates the quasi-static halo interior from the surrounding infalling
material, in ... | 1995-10-30 | 2015-06-24 | [
"astro-ph"
] | Shaun Cole (Durham) and Cedric Lacey (Copenhagen) |
astro-ph/9510145 | Dynamics of Triaxial Galaxies | Luminous galaxies and their dark halos are likely to have triaxial shapes.
The construction of distribution functions for triaxial systems is a hard
problem, due to the existence of only one exact integral of motion, the energy
$E$. Even so, progress has been made by use of analytic methods for special
potentials, nume... | 1995-10-27 | 2008-02-03 | [
"astro-ph"
] | P.T. de Zeeuw |
astro-ph/9510143 | A modified R1 X R1 method for helioseismic rotation inversions | We present an efficient method for two dimensional inversions for the solar
rotation rate using the Subtractive Optimally Localized Averages (SOLA) method
and a modification of the R1 X R1 technique proposed by Sekii (1993). The SOLA
method is based on explicit construction of averaging kernels similar to the
Backus-Gi... | 1995-10-27 | 2015-06-24 | [
"astro-ph"
] | F.P. Pijpers, M.J. Thompson |
astro-ph/9510144 | 3-D SPH Simulations of HD and MHD Jets | We present fully three-dimensional hydrodynamical and magnetohydrodynamical
simulations of supersonic, radiative cooling jets propagating into homogeneous
and stratified environments based on Smoothed Particle Hydrodynamics technique. | 1995-10-27 | 2007-05-23 | [
"astro-ph"
] | E.M. Gouveia Dal Pino and A.H. Cerqueira |
astro-ph/9510146 | The 2D Power Spectrum of the Las Campanas Redshift Survey: Detection of
Excess Power on 100 h^{-1} Mpc Scales | We have measured the 2 dimensional (2D) power spectrum of the Las Campanas
Redshift Survey on scales between 30 and 200 Mpc (q_0=0.5, H_o=100h km sec^{-1}
Mpc^{-1}). Such an analysis is more sensitive to structure on scales > 50 Mpc
than a full 3 dimensional analysis given the geometry of the survey. We find a
strong p... | 1995-10-27 | 2009-06-16 | [
"astro-ph"
] | S. D. Landy, S. A. Shectman, H. Lin, R. P. Kirshner, A. A. Oemler and
D. Tucker |
astro-ph/9510142 | Behaviour of Lagrangian Approximations in Spherical Voids | We study the behaviour of spherical Voids in Lagrangian perturbation theories
L(n), of which the Zel'dovich approximation is the lowest order solution L(1).
We find that at early times higher order L(n) give an increasingly accurate
picture of Void expansion. However at late times particle trajectories in L(2)
begin to... | 1995-10-27 | 2015-06-24 | [
"astro-ph"
] | V. Sahni and S.F. Shandarin |
astro-ph/9510139 | Scalar-Tensor Cosmological Models | We analyze the qualitative behaviors of scalar-tensor cosmologies with an
arbitrary monotonic $\omega(\Phi)$ function. In particular, we are interested
on scalar-tensor theories distinguishable at early epochs from General
Relativity (GR) but leading to predictions compatible with solar-system
experiments. After extend... | 1995-10-26 | 2009-10-28 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | Arturo Serna & Jean-Michel Alimi (LAEC, Observatoire de Meudon,
France) |
astro-ph/9510140 | Constraints on the Scalar-Tensor theories of gravitation from Primordial
Nucleosynthesis | We present a detailed calculation of the light element production in the
framework of Scalar-Tensor (ST) theories of gravitation. The coupling function
\omega has been described by an appropriate form which reproduces all the
possible asymptotic behaviors at early times of viable ST cosmological models
with a monotonic... | 1995-10-26 | 2011-09-09 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | Arturo Serna & Jean-Michel Alimi (LAEC, Observatoire de Meudon,
France) |
astro-ph/9510138 | Comparison of the dense molecular gas in the LINER galaxy NGC 6764 and
in the Wolf-Rayet galaxy NGC 5430 | We compare the dense molecular gas content in two barred spiral galaxies, NGC
6764 (classified LINER) and NGC 5430 (a Wolf-Rayet galaxy). We find a
significant difference in the proportion of dense molecular gas between the two
galaxies. CS(3-2) is detected in NGC 6764 but not in NGC 5430, even though the
intensities o... | 1995-10-26 | 2007-05-23 | [
"astro-ph"
] | T. Contini, H. Wozniak, E. Davoust and S. Considere |
astro-ph/9510141 | Formation of High Redshift Objects in a Cosmic String Theory with Hot
Dark Matter | Using a modification of the Zel'dovich approximation adapted to hot dark
matter, the accretion of such matter onto moving cosmic string loops is
studied. It is shown that a large number of $10^{12}M_\odot$ nonlinear objects
will be produced by a redshift of $z=4$. These objects could be the hosts of
high redshift quasa... | 1995-10-26 | 2015-06-24 | [
"astro-ph"
] | R. Moessner (Max Planck Institut fuer Astrophysik, Garching) and R.
Brandenberger (Brown Univ.) |
astro-ph/9510136 | The Neutron Star and Black Hole Initial Mass Function | Using recently calculated models for massive stellar evolution and supernovae
coupled to a model for Galactic chemical evolution, neutron star and black hole
birth functions (number of neutron stars and black holes as a function of their
mass) are determined for the Milky Way Galaxy. For those stars that explode as
Typ... | 1995-10-26 | 2011-05-05 | [
"astro-ph"
] | F. X. Timmes, S. E. Woosley, and T. A. Weaver |
astro-ph/9510137 | On Second-order Perturbation Theories of Gravitational Instability in
Friedmann-Lemaitre Models | The Eulerian and Lagrangian second-order perturbation theories are solved
explicitly in closed forms in $\Omega \neq 1$ and $\Lambda \neq 0$
{}Friedmann-Lema\^{\i}tre models. I explicitly write the second-order theories
in terms of closed one-dimensional integrals. In cosmologically interested
cases ($\Lambda = 0$ or $... | 1995-10-26 | 2009-10-28 | [
"astro-ph"
] | Takahiko Matsubara (The University of Tokyo) |
astro-ph/9510131 | Colors, Luminosity Function and Counts of Galaxies | Standard models for deep galaxy counts are based on luminosity functions (LF)
with relatively flat faint end ($\alpha\sim-1.0$). Galaxy counts in the B--band
exceed the prediction of such models by a factor of 2 to more than 5, forcing
the introduction of strong luminosity and/or density evolution. Recently Marzke
et a... | 1995-10-25 | 2015-06-24 | [
"astro-ph"
] | P. Saracco, G. Chincarini and A. Iovino |
astro-ph/9510135 | Truncation of the Binary Distribution Function in Globular Cluster
Formation | We investigate a population of primordial binaries during the initial stage
of evolution of a star cluster. For our calculations we assume that equal mass
stars form rapidly in a tidally truncated gas cloud, that $\sim10$\% of the
stars are in binaries and that the resulting star cluster undergoes an epoch of
violent r... | 1995-10-25 | 2009-10-28 | [
"astro-ph"
] | E.Vesperini, D.F. Chernoff |
astro-ph/9510134 | A linear programming approach to inhomogeneous primordial
nucleosynthesis | We examine inhomogeneous primordial nucleosynthesis for {\it arbitrary}
distributions $f$ of the baryon-to-photon ratio $\eta$, in the limit where
neither particle diffusion nor gravitational collapse is important. By
discretizing $f(\eta)$ and using linear programming, we show that for a set of
$m$ constraints on the ... | 1995-10-25 | 2016-08-30 | [
"astro-ph"
] | Richard E. Leonard and Robert J. Scherrer (Ohio State University) |
astro-ph/9510132 | Equilibrium and Stability of Elliptical Galaxies | Recent work on the equilibrium and stability of ellipsoidal stellar systems
is reviewed. The absence of constant-density cores in early-type galaxies
implies that chaos and high-order resonances are generic features of the motion
in triaxial stellar systems. Bending instabilities are now well understood and
may provide... | 1995-10-25 | 2007-05-23 | [
"astro-ph"
] | David Merritt and Tema Fridman (Rutgers University) |
astro-ph/9510133 | The performance of Lagrangian perturbation schemes at high resolution | We present high--spatial resolution studies of the density field as predicted
by Lagrangian perturbation approximations up to the third order. The
first--order approximation is equivalent to the ``Zel'dovich approximation''
for the type of initial data analyzed. The study is performed for two simple
models which allow ... | 1995-10-25 | 2011-05-23 | [
"astro-ph"
] | Thomas Buchert, Georgios Karakatsanis, Robert Klaffl, Peter Schiller |
astro-ph/9510126 | Anisotropy and inhomogeneity of the universe from $\Delta T/T$ | A recent paper (Martinez--Gonzalez & Sanz 1995) showed that if the universe
is homogeneous but anisotropic, then the small quadrupole anisotropy in the
cosmic microwave background radiation implies that the spacetime anisotropy is
very small. We point out that more general results may be established, without
assuming a... | 1995-10-24 | 2007-05-23 | [
"astro-ph"
] | Roy Maartens, George Ellis and William Stoeger |
astro-ph/9510127 | Search for emission-line galaxies towards nearby voids. Observational
data | We present the observational results of our search for emission-line galaxies
(ELG) towards nearby voids. In order to find ELG, we started a survey using the
IIIa-J objective prism plates from the Hamburg QSO Survey. The plates are
digitized and an automatic procedure was applied to select the candidates.
Digitized dir... | 1995-10-24 | 2016-08-30 | [
"astro-ph"
] | Cristina C. Popescu, Ulrich Hopp, Hans J. Hagen, and Hans Elsaesser |
astro-ph/9510128 | X-ray analysis and matter distribution in the lens-cluster Abell 2390 | We present a deep X-ray ROSAT/HRI observation of the rich cluster-lens Abell
2390 and the analysis of the gas and matter distribution in the cluster. The
X-ray centroid coincides with the location of the central cD galaxy, and the
core appears to be dominated by a massive cooling flow, one of the strongest
ones ever st... | 1995-10-24 | 2008-02-03 | [
"astro-ph"
] | M. Pierre, J.F. Le Borgne, G. Soucail, J.P. Kneib |
astro-ph/9510125 | Hydrodynamics of Stellar Mergers and the Formation of Blue Stragglers | The hydrodynamics of stellar collisions and mergers is discussed in the
context of blue straggler formation. Emphasis is placed on the very important
question of hydrodynamic mixing during the merger process. Recent results of
three-dimensional hydrodynamic calculations suggest that the merger remnants
produced by stel... | 1995-10-24 | 2007-05-23 | [
"astro-ph"
] | Frederic A. Rasio (MIT) |
astro-ph/9510130 | On the Uncertainty in X-Ray Cluster Mass Estimates | We study the uncertainty in galaxy cluster mass estimates derived from X-ray
data assuming hydrostatic equilibrium (HE) for the intra cluster gas. Using a
Monte-Carlo procedure we generate a general class of mass models allowing very
massive clusters. We then compute the corresponding temperature profiles via
the HE eq... | 1995-10-24 | 2007-05-23 | [
"astro-ph"
] | C. Balland and A. Blanchard |
astro-ph/9510129 | The Angular Power Spectrum of BATSE 3B Gamma-Ray Burst | We compute the angular power spectrum C_l from the BATSE 3B catalog of 1122
gamma-ray bursts, and find no evidence for clustering on any scale. These
constraints bridge the entire range from small scales (which probe source
clustering and burst repetition) to the largest scales (which constrain
possible anisotropies fr... | 1995-10-24 | 2009-10-07 | [
"astro-ph"
] | Max Tegmark, Dieter Hartmann, Michael Briggs & Charles Meegan |
astro-ph/9510119 | Comparison of Optical, Radio, and Acoustical Detectors for
Ultrahigh-Energy Neutrinos | For electromagnetic cascades induced by electron-neutrinos in South Pole ice,
the effective volume per detector element (phototube, radio antenna, or
acoustic transducer) as a function of cascade energy is estimated, taking
absorption and scattering into account. A comparison of the three techniques
shows that the opti... | 1995-10-23 | 2011-05-23 | [
"astro-ph"
] | P. B. Price (Dept. of Physics, University of California, Berkeley) |
astro-ph/9510113 | The Dynamics of Galactic Warps | Large-scale warps in the outer parts of spiral galaxy discs have been
observed for almost forty years, but their origin remains obscure. We review
the dynamics of warped galaxy discs. We identify several mechanisms that could
excite warps, all involving the gravitational interaction between the disc and
the dark-matter... | 1995-10-23 | 2007-05-23 | [
"astro-ph"
] | Robert W. Nelson and Scott Tremaine |
astro-ph/9510117 | Small Scale Cosmological Perturbations: An Analytic Approach | Through analytic techniques verified by numerical calculations, we establish
general relations between the matter and cosmic microwave background (CMB)
power spectra and their dependence on cosmological parameters on small scales.
Fluctuations in the CMB, baryons, cold dark matter (CDM), and neutrinos receive
a boost a... | 1995-10-23 | 2009-07-22 | [
"astro-ph"
] | Wayne Hu (IAS, Princeton) and Naoshi Sugiyama (Kyoto) |
astro-ph/9510122 | Detection of C2, CN, and NaID absorption in the AGB remnant of HD56126 | We present the detection of molecular absorption lines in the optical
spectrum of the post-AGB star HD56126. The C2 Phillips
A^{1}\Pi_{u}-X^{1}\Sigma^{+}_{g} (1,0), (2,0), and (3,0); Swan
d^{3}\Pi_{g}-a^{3}\Pi_{u} (0,0) and (1,0); and CN Red system
A^{2}\Pi-X^{2}\Sigma^{+} (1,0), (2,0), (3,0), and (4,0) bands have been... | 1995-10-23 | 2007-05-23 | [
"astro-ph"
] | Eric J. Bakker, L.B.F.M. Waters, Henny J.G.L.M. Lamers, Norman R.
Trams, Frank L.A. Van der Wolf |
astro-ph/9510121 | Time resolved spectroscopy of the post-AGB star HD56126 | We have investigated the report of Tamura and Takeuti that the Halpha line of
the F-type post-AGB star HD56126 is variable on time scales of minutes. To this
end, HD56126 was observed on two occasions with the William Herschel Telescope.
Seventeen, respectively thirty spectra were taken within time span of 1.5 hours
in... | 1995-10-23 | 2015-06-24 | [
"astro-ph"
] | Rene D. Oudmaijer, Eric J. Bakker |
astro-ph/9510123 | Motion and Ionization Equilibrium of Hydrogen Atoms in Superstrong
Magnetic Field | We study the effects of finite proton mass on the energy levels of hydrogen
atoms moving transverse to a superstrong magnetic field $B$ with generalized
pseudomomentum $K_\perp$. Field strengths of order $B\sim 10^{12}$ Gauss are
typically found on the surfaces of neutron stars, but we also study the regime
$B\go B_{cr... | 1995-10-23 | 2008-11-26 | [
"astro-ph",
"atom-ph"
] | Dong Lai (Caltech) and Edwin E. Salpeter (Cornell) |
astro-ph/9510120 | The velocity gradient in the pseudo-photosphere of the peculiar
supergiant HD101584 | In this paper preliminary results are presented based on a study of the low
and high resolution ultraviolet spectrum of the peculiar supergiant (post-AGB
star) HD101584. By a comparison of the low resolution spectrum (1200-3200ang)
with standard stars, the star is classified as an A7I, indicating an effective
temperatu... | 1995-10-23 | 2007-05-23 | [
"astro-ph"
] | Eric J. Bakker |
astro-ph/9510114 | The Distance to IC 10 from Near-Infrared Observations of Cepheids | We have measured the distance to the Local Group dwarf irregular galaxy IC 10
from near-infrared $JHK$ observations of Cepheids. The reddening-corrected
distance modulus is $24.57\pm0.21$ mag or $0.82\pm 0.08$ Mpc. This distance
lies at the short end of the range of previous estimates, and is significantly
more accurat... | 1995-10-23 | 2009-10-28 | [
"astro-ph"
] | C.D. Wilson, D.L. Welch, I.N. Reid, A. Saha, and J. Hoessel |
astro-ph/9510124 | Hydrogen Molecules In Superstrong Magnetic Field: II. Excitation Levels | We study the energy levels of H$_2$ molecules in a superstrong magnetic field
($B\go 10^{12}$ G), typically found on the surfaces of neutron stars. The
interatomic interaction potentials are calculated by a Hartree-Fock method with
multi-configurations assuming electrons are in the ground Landau state. Both
the aligned... | 1995-10-23 | 2009-10-28 | [
"astro-ph",
"atom-ph"
] | Dong Lai (Caltech) and Edwin E. Salpeter (Cornell) |
astro-ph/9510118 | Three-body crystallization diagrams and the cooling of white dwarfs | The 3-body crystallization diagrams of C/O/Ne ionic mixtures characteristic
of white dwarf interiors are examined within the framework of the
density-functional theory of freezing. The crystallization process is described
more accurately than in former calculations where the three-component system
was treated as an eff... | 1995-10-23 | 2007-05-23 | [
"astro-ph"
] | Laurent Segretain (Centre de recherche Astronomique de Lyon, UMR 142
du CNRS, France) |
astro-ph/9510116 | X-ray spectra from convective photospheres of neutron stars | We present first results of modeling convective photospheres of neutron
stars. We show that in photospheres composed of the light elements convection
arises only at relatively low effective temperatures (< 3-5*10^4 K), whereas in
the case of iron compositon it arises at < 3*10^ K. Convection changes the
depth dependenc... | 1995-10-23 | 2008-02-03 | [
"astro-ph"
] | V.E. Zavlin, G.G. Pavlov, Yu.A. Shibanov, F.J. Rogers and C.A.
Iglesias |
astro-ph/9510115 | The MHD Kelvin-Helmholtz Instability: A Two-Dimensional Numerical Study | Using a new numerical code we have carried out two-dimensional simulations of
the nonlinear evolution of unstable sheared magnetohydrodynamic flows. We
considered two cases: a strong magnetic field (Alfven Mach number, M_a = 2.5)
and a weak field (M_a =5). Each flow rapidly evolves until it reaches a nearly
steady cond... | 1995-10-23 | 2009-10-28 | [
"astro-ph"
] | Adam Frank, T. W. Jones, Dongsu Ryu, Joseph B. Gaalaas |
astro-ph/9510112 | The Size and Nature of Lyman alpha Forest Clouds Probed by QSO Pairs and
Groups | We describe a robust Bayesian statistical method for determining Lyman alpha
forest cloud sizes in spherical and in thin disk geometries, using absorption
in adjacent sightlines toward closely separated QSO pairs and groups, apply
this method to the available data, and discuss implications of our results for
models of ... | 1995-10-20 | 2009-10-28 | [
"astro-ph"
] | Yihu Fang (Columbia), Robert C. Duncan (Univ of Texas), Arlin P. S.
Crotts (Columbia) and Jill Bechtold (Steward Observatory) |
astro-ph/9510107 | Distributions of Peak Flux and Duration for Gamma-Ray Bursts | Many of the important conclusions about Gamma-Ray Bursts follow from the
distributions of various quantities such as peak flux or duration. We show that
for astrophysical transients such as bursts, multiple selection thresholds can
lead to various forms of data truncation, which can strongly affect the
distributions ob... | 1995-10-20 | 2009-10-28 | [
"astro-ph"
] | Vahe Petrosian, Theodore T. Lee (Stanford University) |
astro-ph/9510102 | Producing Mega-pixel CMB Maps from Differential Radiometer Data | A major goal of cosmology is to obtain sensitive, high resolution maps of the
Cosmic Microwave Background (CMB) anisotropy. Such maps, as would be produced
by the recently proposed Microwave Anisotropy Probe (MAP), will contain a
wealth of primary information about conditions in the early universe. To
mitigate systemat... | 1995-10-20 | 2009-10-28 | [
"astro-ph"
] | Edward L. Wright, Gary Hinshaw and Charles L. Bennett |
astro-ph/9510104 | The MACHO Project Dark Matter Search | We provide a status report on our search for dark matter in our Galaxy in the
form of massive compact halo objects (or Machos), using gravitational
microlensing of background stars. This search uses a very large format CCD
camera on the dedicated 1.27m telescope at Mt.~Stromlo, Australia, and has been
taking data for a... | 1995-10-20 | 2007-05-23 | [
"astro-ph"
] | D.P. Bennett, C. Alcock, R.A. Allsman, T.S. Axelrod, K.H. Cook, K.C.
Freeman, K. Griest, S.L. Marshall, B.A. Peterson, M.R. Pratt, P.J. Quinn,
A.W. Rodgers, C.W. Stubbs, W. Sutherland (The MACHO Collaboration) |
astro-ph/9510106 | Spectral line identification of the ultraviolet spectrum of the peculiar
post-AGB star HD101584 (F0Iape) | The high-resolution (R = 10^4) near-ultraviolet IUE spectrum of the peculiar
post Asymptotic Giant Branch (post-AGB) supergiant HD101584 (F0Iape) has been
analyzed. In the wavelength range between 2500 and 3000ang, 291 out of 332
absorption features are identified. The main contribution comes from FeII, CrII
and MnII. ... | 1995-10-20 | 2008-02-03 | [
"astro-ph"
] | Eric J. Bakker |
astro-ph/9510108 | Voids in Real Space and in Redshift Space | Using two-dimensional numerical simulations of gravitational clustering, with
initial power spectra of a power-law form with index n, we compare the
properties of voids in real space to their properties in redshift space. Both
the void probability function (VPF) and the underdense probability function
(UPF) are enhance... | 1995-10-20 | 2009-10-28 | [
"astro-ph"
] | Barbara Ryden (Ohio State U.) and Adrian Melott (U. of Kansas) |
astro-ph/9510111 | The Frequency Function of Elliptical Galaxy Intrinsic Shapes | We present fully nonparametric estimates of the frequency function of
elliptical galaxy intrinsic shapes under the axisymmetric and triaxial
hypotheses. If elliptical galaxies are assumed to be oblate or prolate, the
frequency function of intrinsic shapes is negative for axis ratios near unity
due to the lack of appare... | 1995-10-20 | 2009-10-28 | [
"astro-ph"
] | Benoit Tremblay and David Merritt (Rutgers University) |
astro-ph/9510109 | Can the lack of symmetry in the COBE/DMR maps constrain the topology of
the universe? | Although the cubic T^3 "small universe" has been ruled out by COBE/DMR
results as an interesting cosmological model, we still have the possibility of
living in a universe with a more anisotropic topology such as a rectangular T^3
"small universe" with one or two of its dimensions significantly smaller than
the present ... | 1995-10-20 | 2009-10-28 | [
"astro-ph",
"gr-qc"
] | Angelica de Oliveira-Costa, George F. Smoot, Alexei A. Starobinsky |
astro-ph/9510110 | Stellar and dynamical evolution within triple systems | About 5-15% of stellar systems are at least triple. About 1% of systems with
a primary of $\tgs 1 \Mscun$ are triple with a {\it longer} peri od that is
less than 30y, and so may in principle be capable of Roche-lobe overflow in
both the inner and the outer orbits, at different times. We discuss possible
evolutionary p... | 1995-10-20 | 2007-05-23 | [
"astro-ph"
] | P.P. Eggleton, L.G. Kiseleva |
astro-ph/9510105 | The Intrinsic Shapes of Stellar Systems | I compute the estimated distribution function f(q) for the apparent axis
ratio q of various types of stellar systems, using a nonparametric kernel
method. I then invert f(q) to find the distribution of intrinsic axis ratios,
using two different hypotheses: first, that the stellar systems are all oblate,
and second, tha... | 1995-10-20 | 2009-10-28 | [
"astro-ph"
] | Barbara S. Ryden |
astro-ph/9510098 | Planetary Nebulae as Probes of Dark Matter in NGC 3384 | We have obtained radial velocities of 68 planetary nebulae surrounding the
SB0 galaxy NGC 3384 in the Leo I group, using the CTIO 4 m telescope and the
Rutgers Fabry-Perot interferometer. The PN system exhibits a well-ordered
rotation field aligned with the photometric axes of the galaxy. The rotation
curve is flat fro... | 1995-10-19 | 2009-10-28 | [
"astro-ph"
] | Benoit Tremblay, David Merritt and T. B. Williams (Rutgers) |
astro-ph/9510097 | Circumstellar molecular line absorption and emission in the optical
spectra of post-AGB stars | We present a list of post-AGB stars showing molecular line absorption and
emission in the optical spectrum. Two objects show CH+, one in emission and one
in absorption, and ten stars show C2 and CN in absorption. The Doppler
velocities of the C2 lines and the rotational temperatures indicate that the
line forming regio... | 1995-10-19 | 2009-10-28 | [
"astro-ph"
] | Eric J. Bakker, Henny J.G.L.M. Lamers, L.B.F.M. Waters, Ton
Schoenmaker |
astro-ph/9510096 | Dynamical Families in the Galacti Globular Cluster System | The Halo Galactic Globular Clusters (GCs) lying inside the solar circle
(\inn, \r $< 8 Kpc$, \feh$<-0.8$) are shown to keep no record of the strong
correlation between GC absolute integrated magnitudes and core parameters
(concentration and central density) clearly detected for the Halo GCs lying
outside this circle (\... | 1995-10-19 | 2015-06-24 | [
"astro-ph"
] | M. Bellazzini, E. Vesperini, F. Fusi Pecci and F.R. Ferraro |
astro-ph/9510094 | Model Atmospheres for Low Field Neutron Stars | We compute model atmospheres and emergent spectra for low field (B<10^10 G)
neutron stars, using new opacity and equation of state data from the OPAL
project. These computations, incorporating improved treatments of flux
transport and convective stability, provide spectra for hydrogen, solar
abundance and iron atmosphe... | 1995-10-19 | 2009-10-28 | [
"astro-ph"
] | Mohan Rajagopal and Roger Romani |
astro-ph/9510100 | Kinematics of the Broad Emission Line Region in NGC 5548 | We derive both total flux and velocity-resolved response functions for the
CIV 1549 emission line from the data obtained in the 1993 NGC 5548 monitoring
campaign. These response functions imply: 1.) the emission region stretches
from inside 1 lt-d to outside 10 lt-d, and is probably better described as
round than flat;... | 1995-10-19 | 2009-10-28 | [
"astro-ph"
] | Christine Done (Durham University) and Julian Krolik (Johns Hopkins
University) |
astro-ph/9510093 | HST Observations of the Luminous IRAS Source FSC10214+4724: A
Gravitationally Lensed Infrared Quasar | We present an image of the redshift 2.3 IRAS source FSC10214+4724 at 0.8
microns obtained with the HST WFPC2 Planetary Camera. The source appears as an
unresolved (< 0.06") arc 0.7" long, with significant substructure along its
length. The arc is centered near an elliptical galaxy 1.18" to the north. An
unresolved comp... | 1995-10-19 | 2009-10-28 | [
"astro-ph"
] | Peter R. Eisenhardt (JPL/Caltech), Lee Armus, David W. Hogg, B. T.
Soifer, G. Neugebauer (Caltech), Michael W. Werner (JPL/Caltech) |
astro-ph/9510099 | Microlensing rates from self-consistent galactic models | We study different models of dark matter distribution for the halo of our
galaxy. In particular, we consider Eddington and King-Michie models, which
[C[C, which include anisotropy in the velocity space, and compute in a
self-consistent way the amount of dark matter present in the halo. Assuming
that the dark matter is ... | 1995-10-19 | 2009-10-28 | [
"astro-ph"
] | F. De Paolis, G. Ingrosso and Ph. Jetzer |
astro-ph/9510095 | Morphological classification and structural parameters for early-type
galaxies in the Coma cluster | We present the results of an isophotal shape analysis of three samples of
galaxies in the Coma cluster. Quantitative morphology, together with structural
and photometric parameters, is given for each galaxy. Special emphasis has been
placed on the detailed classification of early-type galaxies.
The three samples are:... | 1995-10-19 | 2007-05-23 | [
"astro-ph"
] | S. Andreon, E. Davoust, R. Michard, J.-L. Nieto, P. Poulain |
astro-ph/9510101 | The metallicity distribution of G dwarfs in the solar neighbourhood | We derive a new metallicity distribution of G dwarfs in the solar
neighbourhood, using uvby photometry and up-to-date parallaxes. Our
distribution comprises 287 G dwarfs within 25 pc from the Sun, and differs
considerably from the classic solar neighbourhood distribution of Pagel &
Patchett and Pagel by having a promin... | 1995-10-19 | 2015-06-24 | [
"astro-ph"
] | Helio J. Rocha-Pinto and Walter J. Maciel (IAG/USP) |
astro-ph/9510092 | Spiral Structure In The Circum-nuclear Disk At The Center Of The Galaxy
NGC 4258 | Observations of line emission from water masers near the center of the galaxy
NGC 4258 have recently provided compelling evidence for rotating disk of gas,
viewed nearly edge-on, surrounding a massive black hole (Miyoshi etal. 1995).
We show that the disk is only marginally stable to radial perturbations - a
stabilit... | 1995-10-18 | 2009-10-28 | [
"astro-ph"
] | Eyal Maoz |
astro-ph/9510089 | The Nature of the Dark Matter | We review some recent determinations of the amount of dark matter on galactic
and larger scales, with special attention to the dark matter in the Milky Way.
We then briefly review the motivation for and basic physics of several dark
matter candidates, and then go into more depth for two candidates, the
neutralino from ... | 1995-10-18 | 2007-05-23 | [
"astro-ph",
"hep-ph"
] | Kim Griest |
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