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/9407030 | The detectability of planetary companions of compact galactic objects
from their effects on microlensed lightcurves of distant stars | We discuss a possible method for detection of dark companions of galactic
objects of stellar mass. Such binary systems are likely to occur in the
galactic disk and possibly also in the halo. The high incidence of binary and
higher-multiplicity systems in the solar neighborhood, if indicative of the
galactic disk at lar... | 1994-07-11 | 2009-10-22 | [
"astro-ph"
] | A.D. Bolatto and E.E. Falco |
astro-ph/9407027 | Structure Formation in the Universe from Texture Induced Fluctuation | The topic of this letter is structure formation with topological defects. We
first present a partially new, fully local and gauge invariant system of
perturbation equations to treat microwave background and dark matter
fluctuations induced by topological defects (or any other type of seeds). We
show that this treatment... | 1994-07-09 | 2010-11-01 | [
"astro-ph"
] | Ruth Durrer, Zhi-hong Zhou |
astro-ph/9407025 | Radial cluster lensing: A simple differential equation describing arclet
fields | Clusters of galaxies acting as gravitational lenses deform the images of
background galaxies. For small galaxies the deformation is determined by the
local properties of the lens (shear, convergence). Small circular shaped
galaxies are seen as small ellipses. The orientation and axial ratio of the
ellipses could then b... | 1994-07-08 | 2007-05-23 | [
"astro-ph"
] | T.Schramm and R.Kayser |
astro-ph/9407026 | The Inflationary Role of the Dilaton in String Cosmology | It is stressed that the kinematical problems of the standard cosmological
model can be solved by a phase of accelerated contraction of the cosmic scale
factor. Such a behaviour is only a particular case of a more general
``pre-big-bang" inflationary scenario, arising naturally in a string cosmology
context, and driven ... | 1994-07-08 | 2009-10-22 | [
"astro-ph",
"gr-qc",
"hep-th"
] | M.Gasperini |
astro-ph/9407022 | Bright Stars in the Galactic Globular M5 | We present a CCD investigation of the galactic globular M5 aimed to increase
the statistical relevance of the available sample of evolving bright stars.
Previous investigations, limited to the outer cluster region, have been
extended toward the cluster center, more than doubling the number of observed
luminous stars. O... | 1994-07-07 | 2009-10-22 | [
"astro-ph"
] | E.Brocato, V.Castellani, V.Ripepi |
astro-ph/9407024 | Baryonic Dark Matter | In the first two of these lectures, I present the evidence for baryonic dark
matter and describe possible forms that it may take. The final lecture
discusses formation of baryonic dark matter, and sets the cosmological context. | 1994-07-07 | 2009-09-25 | [
"astro-ph"
] | Joseph Silk |
astro-ph/9407019 | New Bounds on Omega Baryons from Observational Big Bang Nucleosynthesis | We re-examine the systematic errors in the determination of the primordial
helium abundance, $Y_{\rm P}$. We find that the systematics are significantly
larger than the statistical errors. The uncertainty in (the determination of)
$Y_{\rm P}$, is thus, larger than is currently claimed. Furthermore, most of
the systemat... | 1994-07-07 | 2009-09-25 | [
"astro-ph"
] | Dimitar D. Sasselov and Dalia Goldwirth |
astro-ph/9407021 | Reconstructing the Inflaton Potential | A review is presented of recent work by the authors concerning the use of
large scale structure and microwave background anisotropy data to determine the
potential of the inflaton field. The importance of a detection of the
stochastic gravitational wave background is emphasised, and some preliminary
new results of test... | 1994-07-07 | 2007-05-23 | [
"astro-ph"
] | Edward W Kolb, Mark Abney, Edmund J Copeland, Andrew R Liddle and
James E Lidsey |
astro-ph/9407023 | Dynamical and Observable Constraints on RAMBOs: Robust Associations of
Massive Baryonic Objects | If the halo dark matter consists of faint baryonic stars, then these objects
probably formed at an early epoch within large associations with similar
dynamical properties to globular or open clusters. We use the luminosity
function of globular clusters as a function of galactocentric distance to
provide a very strong c... | 1994-07-07 | 2009-10-22 | [
"astro-ph"
] | Ben Moore and Joseph Silk |
astro-ph/9407020 | Steady state shocks in accretion disks around a Kerr black hole | Results of numerical simulations of shock solutions in a geometrical thin
accretion disk around a Kerr black hole (BH) are presented. Using the smoothed
particle hydrodynamics (SPH) technique, the influence of the central object is
included by means of an effective potential, We first present the theory of
standing sho... | 1994-07-07 | 2015-06-24 | [
"astro-ph",
"gr-qc"
] | H. Sponholz and D. Molteni |
astro-ph/9407017 | Echo Mappping of the Broad Line Region of AGNs -- A Critical Appraisal | The results of recent AGN monitoring campaigns confirm the ``big picture'' of
the echo paradigm, but the details of the emission-line light curves cannot be
accurately reproduced with only the simplest assumptions, some of which must be
invalid. I discuss possible solutions. I present some preliminary optical light
cur... | 1994-07-06 | 2007-05-23 | [
"astro-ph"
] | Dan Maoz |
astro-ph/9407016 | Equilibrium State of a Massless Self-Interacting Scalar Field in the De
Sitter Background | Behaviour of a weekly self-interacting scalar field with a small mass in the
de Sitter background is investigated using the stochastic approach (including
the case of a double-well interaction potential). Existence of the de Sitter
invariant equilibrium quantum state of the scalar field in the presence of
interaction i... | 1994-07-06 | 2010-04-06 | [
"astro-ph",
"hep-th"
] | Alexei A. Starobinsky and Jun'ichi Yokoyama |
astro-ph/9407018 | The fate of central black holes in merging galaxies | This paper presents results of a series of numerical N-body experiments that
describe the merging of galaxy pairs containing a massive black hole in their
core. The aim is to study the orbital evolution of the two black holes through
the merger event. It is found that merging does NOT lead to the formation of a
CLOSE b... | 1994-07-06 | 2015-06-24 | [
"astro-ph"
] | F. Governato, M. Colpi and L. Maraschi |
astro-ph/9407014 | The Optical Depth to Gravitational Microlensing in the Direction of the
Galactic Bulge | We present the analysis of the first two years of the OGLE search for
gravitational lenses towards the Galactic bulge. We detected 9 microlensing
events in an algorithmic search of $ \sim 10^8 $ measurements of $ \sim 10^6 $
stars. The characteristic time scales are in the range $ 8.6 < t_0 < 62 $ days,
where $ t_0 = R... | 1994-07-05 | 2007-05-23 | [
"astro-ph"
] | A. Udalski, M. Szymanski, K.Z. Stanek, J. Kaluzny, M. Kubiak, M.
Mateo, W. Krzeminski, B. Paczynski, and R. Venkat |
astro-ph/9407012 | Fractal Cold Gas as Dark Matter in Galaxies and Clusters | The conjecture that dark matter in galaxies is mostly cold fractal gas is
developed in the more general context of the thermodynamics of the ideal
isothermal gas subject to gravitational instability. This simple gas model
already contains the contrary ingredients able to prevent an asymptotic
equilibrium: any growing g... | 1994-07-05 | 2007-05-23 | [
"astro-ph"
] | D. Pfenniger, F. Combes |
astro-ph/9407013 | News on Dark Matter in Galaxies and Clusters | Major progresses have been made this last year towards a better knowledge of
the invisible mass. Michel Spiro will talk in details about the micro-lensing
experiments and their promising results; the ROSAT satellite has provided
extended X-ray maps of the hot gas, which traces dark matter in galaxy
clusters: they revea... | 1994-07-05 | 2007-05-23 | [
"astro-ph"
] | F. Combes, D. Pfenniger |
astro-ph/9407015 | Surface Temperature of a Magnetized Neutron Star and Interpretation of
the ROSAT Data. I. Dipolar Fields | We model the temperature distribution at the surface of a magnetized neutron
star and study the effects on the observable X-ray spectra and light curves,
taking fully into account gravitational lensing. Only dipolar fields are
considered here. General features are studied and compared with the ROSAT data
from the pulsa... | 1994-07-05 | 2009-10-22 | [
"astro-ph"
] | Dany Page |
astro-ph/9407010 | Are the Ogle Microlenses in the Galactic Bar? | The analysis of the first two years of OGLE data revealed 9 microlensing
events of the galactic bulge stars, with the characteristic time scales in the
range $ 8.6 < t_0 < 62 $ days, where $ t_0 = R_E / V $. The optical depth to
microlensing is larger than $ ( 3.3 \pm 1.2 ) \times 10^{-6}$, in excess of
current theoret... | 1994-07-04 | 2008-12-18 | [
"astro-ph"
] | B. Paczynski, K. Z. Stanek, A. Udalski, M. Szymanski, J. Kaluzny, M.
Kubiak, M. Mateo, W. Krzeminski |
astro-ph/9407011 | Sizes of Voids as a test for Dark Matter Models | We use the void probability statistics to study the redshift-space galaxy
distribution as described by a volume-limited subsample of the Perseus-Pisces
survey. We compare the results with the same analysis realized on artificial
samples, extracted from high-resolution N-body simulations by reproducing the
observational... | 1994-07-04 | 2009-10-22 | [
"astro-ph"
] | S.Ghigna, S.Borgani, S.Bonometto, L.Guzzo, A.Klypin, J.R.Primack,
R.Giovanelli, M.Haynes |
astro-ph/9407009 | Probable Gravitational Microlensing towards the Galatic Bulge | The MACHO project carries out regular photometric monitoring of millions of
stars in the Magellanic Clouds and Galactic Bulge, to search for very rare
gravitational microlensing events due to compact objects in the galactic halo
and disk. A preliminary analysis of one field in the Galactic Bulge, containing
{$\sim430,0... | 1994-07-03 | 2009-10-22 | [
"astro-ph"
] | C.Alcock, R.Allsman, T.Axelrod, D.Bennett, S.Chan, K.Cook, K.Freeman,
K.Griest, S. Marshall, S.Perlmutter, B.Peterson, M.Pratt, P.Quinn, A.Rodgers,
C.Stubbs, and W.Sutherland |
astro-ph/9407008 | ROSAT PSPC observation of the X-ray faint early-type galaxy NGC5866 | We present the results of the analysis of the ROSAT PSPC pointed observation
of the S0 galaxy NGC5866. Previous Einstein observations had revealed that this
galaxy has a low X-ray to optical ratio Lx/Lb. Theoretical models of the X-ra
emission of early-type galaxies had suggested that in objects of this kind the
emissi... | 1994-07-03 | 2011-05-23 | [
"astro-ph"
] | S. Pellegrini |
astro-ph/9407001 | Gamma Line Radiation Emission from Stellar Winds in Orion Complex: A
test for cosmic ray origin theory | We consider $\gamma$-ray emission from heavy nuclei that are accelerated in
the shocks of stellar winds and are excited in interactions with the ambient
matter in the Orion complex. We show that the recent detection of $\gamma$-ray
lines in the Orion complex by COMPTEL telescope can be explained by such a
scenario, ass... | 1994-07-01 | 2007-05-23 | [
"astro-ph"
] | Biman B. Nath and Peter L. Biermann |
astro-ph/9407002 | A ROSAT Hri Obsrevation of the Cooling Flow Cluster MS0839.9+2938 | A ROSAT HRI observation of the cluster MS0839.9+2938 at z=0.194 is presented.
It confirms the earlier suggestion, based on the detection of extended
H$\alpha$ emission, that the inner regions of this cluster are dominated by a
cooling flow. The surface brightness distribution within the cooling radius
shows structures ... | 1994-07-01 | 2007-05-23 | [
"astro-ph"
] | R. Nesci, G.C. Perola and A. Wolter |
astro-ph/9407003 | The Ensemble Variability Properties of Faint QSOs | A refined sample of 64 variable objects with stellar image structure has been
identified in SA 57 to $B \sim 22.5$, over a time baseline of 15 years, sampled
at 11 distinct epochs. The photometric data typically have a root-mean-square
error at $B = 22$ of only 0.05 mag. Thirty-five quasars in this field have
already b... | 1994-07-01 | 2009-10-22 | [
"astro-ph"
] | D. Trevese, R.G. Kron, S.R. Majewski, M.A. Bershady, D.C. Koo |
astro-ph/9407006 | Big-Bang Nucleosynthesis and the Baryon Density of the Universe | Big-bang nucleosynthesis is one of the cornerstones of the standard
cosmology. For almost thirty years its predictions have been used to test the
big-bang model to within a fraction of a second of the bang. The concordance
that exists between the predicted and observed abundances of D, $^3$He, $^4$He
and $^7$Li provide... | 1994-07-01 | 2009-10-22 | [
"astro-ph"
] | Craig J Copi, David N. Schramm and Michael S. Turner |
astro-ph/9407007 | Cosmological Time Dilation in Gamma Ray Bursts? | Norris et al. (1994) report that the temporal structure of faint gamma ray
bursts is longer than that of bright bursts, as expected for time dilation in
the cosmological models of burst origin. I show that the observed trends can
easily be produced by a burst luminosity function and thus may not result from
cosmologica... | 1994-07-01 | 2009-10-22 | [
"astro-ph"
] | David Band |
astro-ph/9407005 | Models of Galaxies with Central Black Holes: Adiabatic Growth in
Spherical Galaxies | We add black holes to nonrotating, spherical galaxy models, with the
assumption that the black-hole growth is slow compared with the dynamical time
but fast compared with the relaxation time. The outcome differs depending on
whether the core of the initial galaxy does or does not resemble that of an
isothermal sphere. ... | 1994-07-01 | 2010-04-29 | [
"astro-ph"
] | Gerald D. Quinlan, Lars Hernquist, and Steinn Sigurdsson |
astro-ph/9407004 | Mapping the Dark Matter in Clusters | Massive clusters of galaxies gravitationally shear the images of faint
background galaxies. At large impact parameters the shear is weak, but can
still be measured, to a reasonable degree of significance, as a statistical
anisotropy of the faint galaxy images. We describe techniques for measuring the
shear and discuss ... | 1994-07-01 | 2007-05-23 | [
"astro-ph"
] | Nick Kaiser, Gordon Squires, Greg Fahlman and David Woods |
astro-ph/9406076 | Gravitational Wave Induced Large-scale Polarization of \\Cosmic
Microwave Background Radiation | We discuss the contribution of gravitational wave to the cosmic microwave
background radiation (CMBR) anisotropy and polarization. It is found that the
large-scale polarization of CMBR is less than 1\% for a standard recombination
universe. The effect of matter reionization will enhance the CMBR polarization
to a 10\% ... | 1994-06-30 | 2009-10-22 | [
"astro-ph",
"gr-qc"
] | Ka Lok Ng and Kin-Wang Ng |
astro-ph/9406074 | Comment on The Preprint ``Neutrino Flavor Evolution Near A Supernova's
Core'' (Astro-Ph 9405008) by J. Pantaleone | The revised version of the widely circulated preprint ``Neutrino Flavor
Evolution Near A Supernova's Core'' by J. Pantaleone (astro-ph 9405008 on the
Bulletin Board, Indiana University preprint IUHET-276) is wrong. It contains
two errors which lead to incorrect conclusions regarding neutrino flavor
transformation in th... | 1994-06-29 | 2009-09-25 | [
"astro-ph"
] | Yong-Zhong Qian and George M. Fuller |
astro-ph/9406073 | Neutrino-Neutrino Scattering and Matter-Enhanced Neutrino Flavor
Transformation in Supernovae | We examine matter-enhanced neutrino flavor transformation
($\nu_{\tau(\mu)}\rightleftharpoons\nu_e$) in the region above the neutrino
sphere in Type II supernovae. Our treatment explicitly includes contributions
to the neutrino-propagation Hamiltonian from neutrino-neutrino forward
scattering. A proper inclusion of the... | 1994-06-29 | 2010-04-06 | [
"astro-ph"
] | Yong-Zhong Qian and George M. Fuller |
astro-ph/9406075 | Testing Inflation with the Cosmic Background Radiation | In inflation cosmologies, cosmic structure develops through the gravitational
instability of the inevitable quantum noise in primordial scalar fields. I show
how the acceleration of the universe defines the shape of the primordial
spectrum of gravitational metric and scalar field fluctuations. I assess how we
can deter... | 1994-06-29 | 2009-09-25 | [
"astro-ph"
] | J. Richard Bond |
astro-ph/9406071 | The Nature versus Nurture of Anisotropies | With the rapidly growing number of cosmic microwave background measurements
on various scales, there is real hope that the number of acceptable models for
structure formation will be limited to a very few in the near future. Yet any
given model can always be saved by introducing and tuning extraneous free
parameters. T... | 1994-06-28 | 2007-05-23 | [
"astro-ph"
] | Wayne Hu |
astro-ph/9406067 | Beyond the Small-Angle Approximation For MBR Anisotropy from Seeds | In this paper we give a general expression for the energy shift of massless
particles travelling through the gravitational field of an arbitrary matter
distribution as calculated in the weak field limit in an asymptotically flat
space-time. It is {\it not} assumed that matter is non-relativistic. We
demonstrate the sur... | 1994-06-27 | 2009-12-30 | [
"astro-ph"
] | Albert Stebbins and Shoba Veeraraghavan |
astro-ph/9406069 | CBR Anisotropy in an Open Inflation, CDM Cosmogony | We compute the cosmic background radiation anisotropy, produced by
energy-density fluctuations generated during an early epoch of inflation, in an
open cosmological model based on the cold dark matter scenario. At $\Omega_0
\sim$ 0.3 -- 0.4, the COBE normalized open model appears to be consistent with
most observations... | 1994-06-27 | 2009-10-22 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | Marc Kamionkowski, Bharat Ratra, David N. Spergel, and Naoshi Sugiyama |
astro-ph/9406068 | Dynamics of Silent Universes | We investigate the local non--linear dynamics of irrotational dust with
vanishing magnetic part of the Weyl tensor, $H_{ab}$. Once coded in the initial
conditions, this dynamical restriction is respected by the relativistic
evolution equations. Thus, the outcome of the latter are {\it exact solutions}
for special initi... | 1994-06-27 | 2009-10-22 | [
"astro-ph"
] | M. Bruni, S. Matarrese and O. Pantano |
astro-ph/9406070 | Reverberation mapping of active galactic nuclei : The SOLA method for
time-series inversion | In this paper a new method is presented to find the transfer function of the
broad-line region in active galactic nuclei. The subtractive optimally
localized averages (SOLA) method is a modified version of the Backus-Gilbert
method and is presented as an alternative to the more often used
maximum-entropy method. The SO... | 1994-06-27 | 2015-06-24 | [
"astro-ph",
"comp-gas",
"nlin.CG"
] | Frank P. Pijpers and Ignaz Wanders |
astro-ph/9406066 | The Dynamical Survival of Small-Scale Substructure in Relaxed Galaxy
Clusters | We consider the dynamical evolution of small-scale substructure in clusters
within two extreme alternate scenarios for their possible origin: 1) the
accretion of groups (or small clusters) on quasi-radial orbits, and 2) the
merger of clusters of similar masses, followed by the decoupling of their dense
cores. Using sim... | 1994-06-24 | 2009-10-22 | [
"astro-ph"
] | Guillermo Gonz\'alez-Casado, Gary A. Mamon, and Eduard Salvador-Sol\'e |
astro-ph/9406065 | Capanic: A Parallel Tree N-Body Code for Inhomogeneous Clusters of
Processors | We have implemented a parallel version of the Barnes-Hut 3-D N-body tree
algorithm under PVM 3.2.5, adopting an SPMD paradigm. We parallelize the
problem by decomposing the physical domain by means of the {\bf Orthogonal
Recursive Bisection} oct-tree scheme suggested by Salmon (1991), but we modify
the original hypercu... | 1994-06-24 | 2007-05-23 | [
"astro-ph"
] | V. Antonuccio-Delogu and U. Becciani |
astro-ph/9406064 | Relativistic Jets and the Fanaroff-Riley Classification of Radio
Galaxies | Recently, Owen(1993) and Owen and Ledlow (1994) have shown that the dividing
line between Fanaroff-Riley class~I and class~II Radio Sources is very sharp
when the sources are represented as points in the radio-optical luminosity
plane. It is shown that if one accepts the propositions that the sources in the
vicinity of... | 1994-06-23 | 2016-08-30 | [
"astro-ph"
] | Geoffrey V. Bicknell |
astro-ph/9406061 | Gravitational Wave Signatures of Superdense Objects in a Nonsingular
Solution of Gravity Theory | A massive gravitationally bound object with a radius $r \leq 2GM/c^2$, which
occurs in the non-singular version of the nonsymmetric gravitational theory
(NGT), replaces the black hole in Einstein gravity theory. This object is kept
stable by the attractive and repulsive forces generated by NGT, as well as
standard matt... | 1994-06-22 | 2007-05-23 | [
"astro-ph"
] | J. W. Moffat |
astro-ph/9406063 | Carbon Abundances in F and G Dwarfs | We have determined carbon abundances or upper limits from the forbidden [C I]
line at 8727.13 A for 85 F and early G type main sequence stars, with
metallicities ranging between [Fe/H] = -1.0 and [Fe/H] = +0.25. The [C I] line
has not been previously used for a study of this size. We find that the C/Fe
abundance ratio ... | 1994-06-22 | 2007-05-23 | [
"astro-ph"
] | Helena Andersson and Bengt Edvardsson |
astro-ph/9406062 | Blue Stragglers in Galactic Globular Clusters: Playing with Specific
Quantities | We present preliminary results obtained from the comparison of the specific
frequencies of Blue Straggler Stars (BSS) detected so far in a sample of 26
Galactic globular clusters. The number of BSS seems to increase almost linearly
with increasing the amount of sampled light in loose clusters, while it drops
abruptly f... | 1994-06-22 | 2011-05-23 | [
"astro-ph"
] | F.R. Ferraro, F. Fusi Pecci, M. Bellazzini |
astro-ph/9406060 | Quoting Experimental Information | There was a question raised at this meeting as to the best way to present the
results of experiments measuring anisotropies in the CMB. Here we will make
some simple comments about the 3 main competing methods and some suggestions.
In particular we will give an over-simplified but hopefully useful method of
comparing G... | 1994-06-21 | 2007-05-23 | [
"astro-ph"
] | Martin White and Douglas Scott |
astro-ph/9406058 | Dwarf Spheroidals and the Evolution of Not-Too-Old Population II Stars | Previous evolutionary computations concerning stars with masses in the range
of the ``Red Giants Transition Phase'' are extended to lower metallicities.
Clusters isochrones for two values of the metallicity Z (Z=10E-4, 4E-4) and for
ages down to 1 billion years are presented, discussing selected evolutionary
features c... | 1994-06-21 | 2009-09-25 | [
"astro-ph"
] | V.Castellani & S. Degl'Innocenti |
astro-ph/9406057 | Ubc/Laval 2.7-Meter Liquid Mirror Telescope | We report the successful development and operation of a large astronomical
liquid-mirror telescope. Employing a rotating 2.7-meter diameter mirror with a
surface of liquid mercury, the telescope images a half-degree diameter field
centered at the zenith. Located near Vancouver, British Columbia, it is
equipped with a l... | 1994-06-21 | 2019-08-17 | [
"astro-ph"
] | P.Hickson, E.F.Borra, R.Cabanac, R.Content, B.K.Gibson, G.A.H.Walker |
astro-ph/9406059 | Analytic Error Estimates | I present an analytic method for estimating the errors in fitting a
distribution. A well-known theorem from statistics gives the minimum variance
bound (MVB) for the uncertainty in estimating a set of parameters $\l_i$, when
a distribution function $F(z;\l_1 ... \l_m)$ is fit to $N$ observations of the
quantity(ies) $z... | 1994-06-21 | 2009-10-22 | [
"astro-ph"
] | Andrew Gould |
astro-ph/9406054 | Circumstellar Interaction in SN 1993J | The radio and X-ray observations of SN 1993J during the first year can be
consistently explained as a result of interaction of the expanding ejecta with
a circumstellar medium. The density of the circumstellar gas can be deduced
from the free-free absorption of the radio emission and from the X-ray
luminosity. During t... | 1994-06-18 | 2007-05-23 | [
"astro-ph"
] | C. Fransson, P. Lundqvist and R.A. Chevalier |
astro-ph/9406055 | Relativistic Radiative Transfer for Spherical Flows | We present a new complete set of Lagrangian relativistic hydrodynamical
equations describing the transfer of energy and momentum between a standard
fluid and a radiation fluid in a general non-stationary spherical flow. The new
set of equations has been derived for a particular application to the study of
the cosmologi... | 1994-06-18 | 2010-04-06 | [
"astro-ph"
] | Luciano Rezzolla, John C. Miller |
astro-ph/9406056 | Phenomenological Aspects of the Pre-Big-Bang Scenario in String
Cosmology | I review various aspects of the pre-big-bang scenario and of its main open
problems, with emphasis on the role played by the dilaton. Since the dilaton is
a compelling consequence of string theory, tests of this scenario are direct
tests of string theory and also, more generally, of Planck scale physics. | 1994-06-18 | 2016-08-30 | [
"astro-ph",
"gr-qc",
"hep-th"
] | M. Gasperini |
astro-ph/9406053 | Variable Smoothing Lengths and Energy Conservation in Smoothed Particle
Hydrodynamics | We present a new formulation of the equations of motion used in smoothed
particle hydrodynamics (SPH). The spatial resolution in SPH is determined by
the smoothing length, $h$, and it has become common practice for each particle
to be given its own adaptive smoothing length, $h_i$. Consequently, the dynamic
range that ... | 1994-06-17 | 2015-06-24 | [
"astro-ph"
] | Richard P. Nelson and John C.B. Papaloizou |
astro-ph/9406051 | The gravitational deflection of light in MOND | The deflection angle $\Delta\phi$ of light rays by the gravitational field of
a spherical system $M(r)$ is calculated using the MOdified Newtonian Dynamics
(MOND). It is shown that $\Delta\phi$ with an impact parameter $r_0$ can be
expressed by the measured rotation velocity $v(r)$ as
$\Delta\phi(r_0)=2\int_{r_0}^{\i... | 1994-06-17 | 2016-08-30 | [
"astro-ph"
] | Q. Bo, X.P. Wu and Z.L. Zou |
astro-ph/9406052 | Mapping Cluster Mass Distributions via Gravitational Lensing of
Background Galaxies | We present a new method for measuring the projected mass distributions of
galaxy clusters. The gravitational amplification is measured by comparing the
joint distribution in redshift and magnitude of galaxies behind the cluster
with that of field galaxies. We show that the total amplification is directly
related to the... | 1994-06-17 | 2009-10-22 | [
"astro-ph"
] | T.J. Broadhurst, A.N. Taylor and J.A. Peacock (Royal Observatory,
Blackford Hill, Edinburgh, UK) |
astro-ph/9406050 | A Two-Fluid Approximation for Calculating the Cosmic Microwave
Background Anisotropies | We present a simple, yet accurate approximation for calculating the cosmic
microwave background anisotropy power spectrum in adiabatic models. It consists
of solving for the evolution of a two-fluid model until the epoch of
recombination and then integrating over the sources to obtain the CMB
anisotropy power spectrum.... | 1994-06-17 | 2009-10-22 | [
"astro-ph"
] | Uros Seljak |
astro-ph/9406047 | Statistical Constraints on the Inflation Effective Potential from the
COBE DMR Results | We explore constraints on various forms for the effective potential during
inflation based upon a statistical comparison between inflation-generated
fluctuations in the cosmic microwave background temperature and the COBE DMR
results. Fits to the first year 53 A + B x 90 A + B cross correlation function
using an effect... | 1994-06-16 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | Hannu Kurki-Suonio and Grant J. Mathews |
astro-ph/9406049 | The Optical Redshift Survey: Sample Selection and the Galaxy
Distribution | This is the first in a series of papers describing the {\it Optical Redshift
Survey} (ORS), a redshift survey of optically selected galaxies covering 98\%
of the sky above $|b| = 20^\circ$ (8.09 ster). The survey is drawn from the
UGC, ESO, and ESGC galaxy catalogues, and contains two sub-samples, one
complete to a $B$... | 1994-06-16 | 2009-10-22 | [
"astro-ph"
] | B.X. Santiago, M.A. Strauss, O. Lahav, M. Davis, A. Dressler, J.
Huchra |
astro-ph/9406048 | Lyman alpha absorption at low redshifts and hot gas in galactic haloes | Motivated by recent observation of Lanzetta et al. that most luminous
galaxies at low redshifts produce $\lya$ absorption at impact parameter $l\lsim
160 \kpch$, we propose that these absorbers are clouds confined by the pressure
of ambient hot gas in galactic haloes. We determine the properties of this hot
gas and of ... | 1994-06-16 | 2016-06-08 | [
"astro-ph"
] | H.J. Mo |
astro-ph/9406046 | Polarization and Anisotropy of the Microwave Sky | We study the polarization-polarization and polarization-temperature
correlations in standard adiabatic scenarios for structure formation.
Temperature anisotropies due to gravitational potential wells and oscillations
in the photon-baryon-electron fluid on the surface of last scattering are each
associated with a correl... | 1994-06-14 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | David Coulson, Robert G. Crittenden and Neil Turok |
astro-ph/9406045 | Stochastic Inflation: New Results | This is an old article which has never been posted for public use and which
only appeard in a relatively hard-to-get Proceedings of the Sakharov Conference
in Moscow (May, 1991). The subject of this article has received a lot of
attention in last two years. Although we acknowledge that there has been a very
big progres... | 1994-06-14 | 2007-05-23 | [
"astro-ph"
] | A.Mezhlumian and A.Starobinsky |
astro-ph/9406043 | The Galaxy Group/Cosmology Connections | \def\spose#1{\hbox to 0pt{#1\hss}} \def\lta{\mathrel{\spose{\lower
3pt\hbox{$\mathchar"218$}}
\raise 2.0pt\hbox{$\mathchar"13C$}}} Groups of galaxies are highly linked to
cosmology: 1) groups are tidally destroyed by the tidal field of the cluster
they fall into; 2) spherical infall leads to the young cosmo-dynamical... | 1994-06-14 | 2007-05-23 | [
"astro-ph"
] | Gary A. Mamon (IAP) |
astro-ph/9406044 | Star Forming Galaxy Models: Blending Star Formation into TREESPH | We have incorporated star formation algorithms into a hybrid N-body/smoothed
particle hydrodynamics code (TREESPH) in order to describe the star forming
properties of disk galaxies over timescales of a few billion years. The models
employ a Schmidt law of index $n\sim 1.5$ to calculate star formation rates,
and explici... | 1994-06-14 | 2007-05-23 | [
"astro-ph"
] | Chris Mihos and Lars Hernquist |
astro-ph/9406042 | Femtolensing: Beyond the Semi-Classical Approximation | Femtolensing is a gravitational lensing effect in which the magnification is
a function not only of the positions and sizes of the source and lens, but also
of the wavelength of light. Femtolensing is the only known effect of
$(10^{-13}-10^{-16} M_{\sun})$ dark-matter objects and may possibly be
detectable in cosmologi... | 1994-06-13 | 2009-10-22 | [
"astro-ph"
] | A. Ulmer and J. Goodman |
astro-ph/9406036 | Determining Gravitational Masses of Galaxy Clusters With (1)Virial
Equilibrium And (2)Arc-like Images | The mass derived from gravitational lensing reflects the total mass contained
in the lensing system, independent of the specific matter contents and states.
A comparison of the dynamical masses from hydrostatic equilibrium with the
gravitational masses from arc-like images of background galaxies is made for
four cluste... | 1994-06-13 | 2009-10-22 | [
"astro-ph"
] | Xiang-Ping Wu |
astro-ph/9406037 | VLBI Observations of a Complete Sample of Radio Galaxies. IV-The Radio
Galaxies NGC2484, 3C109 and 3C382 | We present here new VLBI observations of one FR-I radio galaxy (NGC2484) and
two Broad Line FR-II radio galaxies (3C109 and 3C382). For 3C109 new VLA maps
are also shown. These sources belong to a complete sample of radio galaxies
under study for a better knowledge of their structures at parsec resolution.
The parsec s... | 1994-06-13 | 2009-10-22 | [
"astro-ph"
] | G. Giovannini, L. Feretti, T.Venturi, L. Lara, J. Marcaide, M. Rioja,
S. R. Spangler, A. E. Wehrle |
astro-ph/9406040 | Interpreting the candidate Galactic microlensing events | Four microlensing collaborations are presently searching for compact matter
in the Galaxy and all have detected possible candidates. Using the detection
efficiencies recently published by the MACHO and OGLE collaborations, we
present Monte-Carlo calculations of the expected optical depth, rates and
timescales, along th... | 1994-06-13 | 2015-06-24 | [
"astro-ph"
] | Eamonn J. Kerins |
astro-ph/9406039 | Solar Neutrinos: Sensitivity to Pre-Main Sequence Evolution and to the
Depth of the Convective Zone | Predicted rates for solar neutrino experiments that are obtained with a
modified stellar evolution code originally developed to study the advanced
stages of stellar evolution are shown to be in agreement with other
recently-calculated precise solar models to about 2% (0.2 SNU for the chlorine
experiment). Different sce... | 1994-06-13 | 2009-10-22 | [
"astro-ph"
] | John N. Bahcall and Ami Glasner |
astro-ph/9406038 | Can Standard Cosmological Models Explain the Observed Abell Cluster Bulk
Flow? | Lauer \& Postman (LP) observe that all Abell clusters with redshifts less
than 15,000\kms\ appear to be participating in a bulk flow of 689 km s$^{-1}$
with respect to the Cosmic Microwave Background. We find this result difficult
to reconcile with all popular models for large-scale structure formation that
assume Gaus... | 1994-06-13 | 2009-10-22 | [
"astro-ph"
] | M.A. Strauss, R. Cen, J.P. Ostriker, T.R. Lauer, and M. Postman |
astro-ph/9406041 | Simulations of Relativistic Extragalactic Jets | We describe a method for the numerical solution of the relativistic Euler
equations which we have found to be both robust and efficient, and which has
enabled us to simulate relativistic jets. The technique employs a solver of the
Godunov-type, with approximate solution of the local Riemann problems, applied
to laborat... | 1994-06-13 | 2007-05-23 | [
"astro-ph"
] | G. Comer Duncan and Philip A. Hughes |
astro-ph/9406033 | Dynamical Model of Pulsar-Planet Systems | About two years ago, Wolszczan and Frail announced the detection of a
possible planetary system consisting of two Earth-mass planets around a
millisecond pulsar. It was pointed out shortly thereafter that the mutual
gravitational interaction of the planets leads to predictable evolution of
their orbits. Because millise... | 1994-06-11 | 2007-05-23 | [
"astro-ph"
] | Renu Malhotra |
astro-ph/9406034 | Simulations of Clusters of Galaxies | The degree of complexity and, to a somewhat lesser degree, realism in
simulations has advanced rapidly in the past few years. The simplest approach -
modeling a cluster as collisionless dark matter and collisonal, non--radiative
gas is now fairly well established. One of the most fruitful results of this
approach is th... | 1994-06-11 | 2007-05-23 | [
"astro-ph"
] | August E. Evrard |
astro-ph/9406035 | Viscosity Prescriptions in Accretion Disks with Shock Waves | We study the evolution of viscous, isothermal, rotating, thin, axisymmetric
accretion disks around a compact object using Smoothed Particle Hydrodynamics.
We emphasize the effects of different choices of viscosity prescriptions on the
evolution of angular momentum as well as other physical quantities of the disk.
We sh... | 1994-06-11 | 2008-02-03 | [
"astro-ph"
] | Sandip K. Chakrabarti and Diego Molteni |
astro-ph/9406032 | Hydrodynamics of Binary Coalescence. II. Polytropes with Gamma=5/3 | We present a new numerical study of the equilibrium and stability properties
of close binary systems using the smoothed-particle hydrodynamics (SPH)
technique. We adopt a simple polytropic equation of state $p=K\rho^\gam$ with
$\gam=5/3$ and $K=\,$constant within each star, applicable to low-mass
degenerate dwarfs as w... | 1994-06-10 | 2009-10-22 | [
"astro-ph"
] | F. A. Rasio and S. L. Shapiro |
astro-ph/9406031 | Implications of Neutrino Balls as the Source of Gamma-Ray Bursts | (To appear in the Astrophysical Journal) Holdom and Malaney (1994) have
suggested a mechanism for gamma-ray bursts which requires that stars be
captured by a neutrino ball. Neutrino balls would be, for the most part, denser
than main sequence stars, but their density would decrease as their mass
increased. We show that... | 1994-06-10 | 2009-10-22 | [
"astro-ph"
] | D.Syer, Cita |
astro-ph/9406027 | New Automatic Identification Technique for OB Associations in Unresolved
Galaxies | We present a new automatic technique based on Principal Component Analysis
and Cluster Analysis, with the aim of its application to the identification of
those clumps in unresolved galaxies which likely represent regions of star
formation. We test the method by applying it to the galaxy M~31, for which
there are alread... | 1994-06-09 | 2011-05-23 | [
"astro-ph"
] | S. Adanti, P. Battinelli, R. Capuzzo--Dolcetta and P.W. Hodge |
astro-ph/9406030 | Evidence from Gravitational Lensing for a Non-Thermal Pressure Support
in the Cluster of Galaxies A2218 | The central mass distribution of clusters of galaxies can be inferred from
gravitationally lensed arcs with known redshifts. For the Abell cluster 2218,
this method yields a core mass which is larger by a factor of $2.5 \pm 0.5$
than the value deduced from X-ray observations, under the assumptions that the
gas is suppo... | 1994-06-09 | 2009-10-22 | [
"astro-ph"
] | Abraham Loeb and Shude Mao |
astro-ph/9406029 | The Mass Function of Cosmic Structures with Non-Spherical Collapse | Non-spherical dynamical approximations and models for the gravitational
collapse are used to extend the well-known Press \& Schechter (PS) approach, in
order to determine analytical expressions for the mass function of cosmic
structures. The problem is rigorously set up by considering the intrinsic
Lagrangian nature of... | 1994-06-09 | 2009-09-25 | [
"astro-ph"
] | Pierluigi Monaco |
astro-ph/9406028 | Black Holes from Blue Spectra | Blue primordial power spectra with a spectral index $n>1$ can lead to a
significant production of primordial black holes in the very early Universe.
The evaporation of these objects leads to a number of observational
consequences and a model independent upper limit of $n \approx 1.4$. In some
cases this limit is streng... | 1994-06-09 | 2007-05-23 | [
"astro-ph",
"gr-qc"
] | James E. Lidsey, B.J. Carr & J.H. Gilbert |
astro-ph/9406024 | Stability of Fireballs and $\gamma$-Ray Bursts | Fireballs are an essential part of any cosmological $\gamma$-ray burst. We
drive here a stability criterion for fireballs and show that fireballs are
Rayleigh-Taylor unstable in any region in which the entropy decreases outward.
The instability begins to operate when the fireball becomes matter dominated.
Among the pos... | 1994-06-08 | 2009-10-22 | [
"astro-ph"
] | Eli Waxman and Tsvi Piran |
astro-ph/9406026 | The Imprint of $\Omega$ on the Cosmic Microwave Background | We investigate the dependence of large angular scale cosmic microwave
background anisotropies on various initial conditions, including both adiabatic
and isocurvature perturbations and the initial power law index $n$, in a
variety of low-$\Omega$ cosmological models. Cosmological constant- dominated
flat models and inf... | 1994-06-08 | 2009-10-22 | [
"astro-ph"
] | Naoshi Sugiyama and Joseph Silk |
astro-ph/9406022 | Secular Evolution of the Eccentricity in the PSR 1620-26 Triple System | A simple analytic calculation is presented for the secular evolution of the
eccentricities in a hierarchical triple system such as the one containing the
millisecond pulsar PSR 1620-26 in M4. If the second companion of PSR 1620-26 is
of stellar mass ($m_2\ga0.1\,M_\odot$), an eccentricity as large as that
observed toda... | 1994-06-08 | 2007-05-23 | [
"astro-ph"
] | F. A. Rasio |
astro-ph/9406025 | Integrated photometric properties of open clusters | Galactic open clusters provide an abundant sample of stellar aggregates of
various sizes, ages and metal abundances, apt to constitute a template for
comparison with star systems in other galaxies. In this paper we present and
discuss a standard methodology to synthesize {\sl U,B,V} fluxes and colours,
and apply it to ... | 1994-06-08 | 2011-05-23 | [
"astro-ph"
] | P. Battinelli, A. Brandimarti, and R. Capuzzo--Dolcetta |
astro-ph/9406023 | Environmental Effects on Local Active Galactic Nuclei | Using an extensive sample of nearby galaxies (the Nearby Galaxies Catalog, by
Tully), we investigate the environment of the galaxies hosting low-luminosity
AGNs (Seyferts and LINERs). We define the local galaxy density, adopting a new
correction for the incompleteness of the galaxy sample at large distances. We
conside... | 1994-06-08 | 2009-10-22 | [
"astro-ph"
] | Pierluigi Monaco, Giuliano Giuricin, Fabio Mardirossian, Marino
Mezzetti |
astro-ph/9406021 | $\gamma$-Ray Pulsars: Emission Zones and Viewing Geometries, A Computer
Animation | The computer animation illustrates the geometries described in a paper by the
same authors. The preprint is available as number 9401045. The opening scene
shows dipole field lines emanating from the polar caps of a rotating neutron
star. The dipole axis is inclined along the green rods. The field lines shown
are define... | 1994-06-08 | 2007-05-23 | [
"astro-ph"
] | I.-A. Yadigaroglu and Roger W. Romani |
astro-ph/9406020 | Power Spectrum of Cosmic String Perturbations on the Microwave
Background | I review recent progress towards a detailed understanding of the power
spectrum of cosmic string perturbations induced on the Microwave Background
(CMB). The use of a simple analytic model allows to include important effects
that have not been included in previous studies. These effects are potential
fluctuations on th... | 1994-06-07 | 2007-05-23 | [
"astro-ph",
"hep-ph"
] | Leandros Perivolaropoulos |
astro-ph/9406016 | Lagrangian Dynamics in Non-Flat Universes and Non-Linear Gravitational
Evolution | We present a new formalism which allows to derive the general Lagrangian
dynamical equations for the motion of gravitating particles in a non--flat
Friedmann universe with arbitrary density parameter $\Omega$ and no
cosmological constant. We treat the set of particles as a Newtonian
collisionless fluid. The non--linear... | 1994-06-07 | 2015-06-24 | [
"astro-ph"
] | Paolo Catelan (Department of Astrophysics, Oxford) |
astro-ph/9406018 | Abundances of four very metal-poor stars of the BPS survey | High resolution CASPEC and EMMI spectra (R$\approx$10$^4$) of the faint
metal- deficient candidates CS 22891--209, CS 22897--8, CS 22948--66 and CS
22968--14 taken from the survey of Beers, Preston and Shectman (1985, BPS) are
analyzed for abundances. The fine analysis with LTE model atmospheres gives an
iron metallici... | 1994-06-07 | 2007-05-23 | [
"astro-ph"
] | Francesca Primas, Paolo Molaro and Fiorella Castelli |
astro-ph/9406017 | Constraints to the Masses of Brown Dwarf Candidates from the Lithium
Test | We present intermediate dispersion (0.7-2.2 \AA ~pix$^{-1}$) optical
spectroscopic observations aimed at applying the ``Lithium Test'' to a sample
of ten brown dwarf candidates located in the general field, two in young open
clusters, and two in close binaries. We find evidence for strong Li depletion
in all of them, a... | 1994-06-07 | 2015-06-24 | [
"astro-ph"
] | E.L. Martin, R. Rebolo, A. Magazzu |
astro-ph/9406019 | M Dwarfs, Microlensing, and the Mass Budget of the Galaxy | We show that faint red stars do not contribute significantly to the mass
budget of the Galaxy or to microlensing statistics. Our results are obtained by
analyzing two long exposures of a high-latitude field taken with the Wide Field
Camera on the newly repaired {\it Hubble Space Telescope}. Stars are easily
distinguish... | 1994-06-07 | 2009-10-22 | [
"astro-ph"
] | John N. Bahcall, Chris Flynn, Andrew Gould, and Sofia Kirhakos |
astro-ph/9406014 | Non--Gaussian Effects in the Cosmic Microwave Background from Inflation | The presence of non--Gaussian features in the Cosmic Microwave Background
(CMB) radiation maps represents one of the most long--awaited clues in the
search for the actual structure of the primordial radiation, still needing
confirmation. These features could shed some light on the non trivial task of
distinguishing the... | 1994-06-06 | 2009-10-22 | [
"astro-ph"
] | Alejandro Gangui |
astro-ph/9406012 | New Evidence for the Cosmological Origin of Gama-Ray Bursts | We compare the burst distribution of the new (2B) BATSE catalogue to a
cosmological distribution. We find that the distribution is insensitive to
cosmological parameters such as Omega and Lambda and to the width of the bursts
luminosity function. The maximal red shift of the long bursts is ~2.1 (assuming
no evolution) ... | 1994-06-06 | 2009-09-25 | [
"astro-ph"
] | Ehud Cohen, Tsafrir Kolatt and Tsvi Piran (Racah Institute for
Physics, The Hebrew University, Jerusalem, Israel) |
astro-ph/9406015 | The Flattened Dark Halo of Polar Ring Galaxy NGC 4650A: A Conspiracy of
Shapes? | Kinematics and photometry of the polar ring galaxy NGC 4650A, including new
observations of the rotation and velocity dispersion of its central stellar
disk, are used to infer the presence of a dark matter halo and to measure its
shape. Fits to the observed disk and polar ring rotation curves from detailed
mass and pho... | 1994-06-06 | 2009-10-22 | [
"astro-ph"
] | Penny D. Sackett, Hans-Walter Rix, Brian J. Jarvis, and Kenneth C.
Freeman |
astro-ph/9406013 | Perturbative Lagrangian Approach to Gravitational Instability | This paper deals with the time evolution in the matter era of perturbations
in Friedman-Lemaitre models with arbitrary density parameter $\Omega$, with
either a zero cosmological constant, $\Lambda = 0$, or with a non-zero
cosmological constant in a spatially flat Universe. Unlike the classical
Eulerian approach where ... | 1994-06-06 | 2011-05-23 | [
"astro-ph"
] | F.R. Bouchet, S. Colombi, E. Hivon, R. Juszkiewicz |
astro-ph/9406010 | Introduction: Why and How to Probe the Zone of Avoidance ? | The motivation and major ways for probing the Zone of Avoidance (ZOA) are
reviewed. Galaxies hidden behind the ZOA may have important implications for
the internal dynamics of the Local Group, for the origin of its motion relative
to the Microwave Background, and for the connectivity of the large scale
structure. Curre... | 1994-06-05 | 2007-05-23 | [
"astro-ph"
] | Ofer Lahav |
astro-ph/9406011 | Wiener Reconstruction of All-Sky Spherical Harmonic Maps of the Large
Scale Structure | A statistical method for reconstructing large scale structure behind the Zone
of Avoidance is presented. It also corrects for shot-noise and for redshift
distortion in galaxy surveys. The galaxy distribution is expanded in an
orthogonal set of spherical harmonics. We show that in the framework of
Bayesian statistics an... | 1994-06-05 | 2007-05-23 | [
"astro-ph"
] | Ofer Lahav |
astro-ph/9406009 | Wiener Reconstruction of Density, Velocity, and Potential Fields from
All-Sky Galaxy Redshift Surveys | We present a new method for recovering the cosmological density, velocity,
and potential fields from all-sky redshift catalogues. The method is based on
an expansion of the fields in orthogonal radial (Bessel) and angular (spherical
harmonic) functions. In this coordinate system, peculiar velocities introduce a
couplin... | 1994-06-03 | 2015-06-24 | [
"astro-ph"
] | Karl Fisher, Ofer Lahav, Yehuda Hoffman, Donald Lynden-Bell, and
Saleem Zaroubi |
astro-ph/9406008 | Cosmological Simulations of Galaxy Formation Including Hydrodynamics
(hyper-abridged) | The formation of galaxies in hierarchical cosmogonies is studied using high
resolution N-body plus SPH hydrodynamics simulations. The collapse of structure
is followed self-consistently from Mpc scale filamentary structures to kpc
scale galactic objects. The characteristics and formation processes of the
galaxy like ob... | 1994-06-02 | 2007-05-23 | [
"astro-ph"
] | F J Summers |
astro-ph/9406007 | On the nature of gamma-ray burst time dilations | The recent discovery that faint gamma-ray bursts are stretched in time
relative to bright ones has been interpreted as support for cosmological
distances: faint bursts have their durations redshifted relative to bright
ones. It was pointed out, however, that the relative time stretching can also
be produced by an intri... | 1994-06-02 | 2009-10-22 | [
"astro-ph"
] | Ralph A.M.J. Wijers and Bohdan Paczy\'nski |
astro-ph/9406006 | On the Nature of Photospheric Oscillations in Strong X--Ray Bursts | A possible sound origin for the photospheric oscillations in the X--ray
bursting sources 1608-522 and 2127+119 is suggested. It is shown that standing
sound waves in an expanding spherical envelope can have periods very close to
the observed ones. The quite large ratio, $\sim$ 10, of the periods in the two
sources is e... | 1994-06-02 | 2009-10-22 | [
"astro-ph"
] | Iosif Lapidus, Luciano Nobili and Roberto Turolla |
astro-ph/9406005 | Effects of Photoionization on Galaxy Formation | We investigate the effects of the observed UV background radiation on galaxy
formation. Photoionization by UV radiation decreases the cooling rate of the
gas in halos, so that objects with only large density contrasts can self-shield
against the background radiation, thereby allowing the shielded neutral cores
to cool ... | 1994-06-02 | 2009-10-22 | [
"astro-ph"
] | Masashi Chiba and Biman B. Nath |
astro-ph/9406004 | Modeling the Radial Distribution of Blue Stragglers in M3 | Recent surveys of the blue straggler (BS) population in the galactic globular
cluster M3 (NGC 5272) give the first complete characterization of the number
density of BSs as a function of radius over an entire globular cluster. The BSs
in M3 are overabundant at large radii, and significantly underabundant at
intermediat... | 1994-06-01 | 2009-10-22 | [
"astro-ph"
] | Steinn Sigurdsson, Melvyn B. Davies and Michael Bolte |
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