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/9404056 | Delayed Gev Emission from Cosmological Gamma-Ray Bursts : Impact of a
Relativistic Wind on External Matter | Sudden collapse of a compact object, or coalescence of a compact binary, can
generate an unsteady relativistic wind that lasts for a few seconds. The wind
is likely to carry a high magnetic field; and its Lorentz factor depends on the
extent to which it is 'loaded' with baryons. If the Lorentz factor is $\sim
100$, int... | 1994-04-22 | 2016-06-08 | [
"astro-ph"
] | P. Meszaros and M.J. Rees |
astro-ph/9404053 | Direct mechanism in solar nuclear reactions | A short overview of the direct reaction mechanism and the models used for the
analysis of such processes is given. Nuclear reactions proceeding through the
direct mechanism and involved in solar hydrogen burning are discussed. The
significance of these nuclear reactions with respect to the solar neutrino
problem is inv... | 1994-04-22 | 2009-10-22 | [
"astro-ph"
] | H. Oberhummer and G. Staudt |
astro-ph/9404052 | Omega from the skewness of the cosmic velocity divergence | We propose a method for measuring the cosmological density parameter $\Omega$
from the statistics of the divergence field, $\theta \equiv H^{-1} \div v$, the
divergence of peculiar velocity, expressed in units of the Hubble constant, $H
\equiv 100 h km/s/Mpc$. The velocity field is spatially smoothed over $\sim 10
h^{-... | 1994-04-22 | 2015-06-24 | [
"astro-ph"
] | F. Bernardeau, R. Juszkiewicz, A. Dekel and F.R. bouchet |
astro-ph/9404054 | Scaling in the Universe | The aim of this review article is to give a comprehensive description of the
scaling properties detected for the distribution of cosmic structures. Due to
the great variety of statistical methods to describe the large-scale structure
of the Universe, I will mainly concentrate on those methods which reveal
remarkable re... | 1994-04-22 | 2008-11-26 | [
"astro-ph"
] | Stefano Borgani |
astro-ph/9404058 | The Properties of an HI-Selected Galaxy Sample | We analyze the properties of a sample of galaxies identified in a 21-cm,
HI-line survey of selected areas in the Perseus-Pisces supercluster and its
foreground void. Twelve fields were observed in the supercluster, five of them
(target fields) centered on optically bright galaxies, and the other seven
(blank fields) se... | 1994-04-22 | 2009-10-22 | [
"astro-ph"
] | A. Szomoru, P. Guhathakurta, J. van Gorkom, J. Knapen, D. Weinberg &
A. Fruchter |
astro-ph/9404057 | The Stellar Populations of the Carina Dwarf Spheroidal Galaxy: I. a New
Color-Magnitude Diagram for the Giant and Horizontal Branches | We report on the first in a series of studies of the Carina dwarf spheroidal
galaxy, a nearby satellite of our Galaxy. Our two major results are: 1) precise
BI photometry ($\sigma_{B-I} \simlt 0.05$ for $V \simlt 22$) for 11,489 stars
in the Carina field, and 2) the detection of two, morphologically distinct,
horizonta... | 1994-04-22 | 2009-10-22 | [
"astro-ph"
] | T. A. Smecker-Hane, P. B. Stetson, J. E. Hesser and M. D. Lehnert |
astro-ph/9404051 | Hierarchical Clustering and the Butcher-Oemler Effect | We show that the rapid evolution in the fraction of blue, star-forming
galaxies seen in clusters as a function of redshift (the Butcher-Oemler effect)
can be explained very simply if structure formation in the universe proceeeds
hierarchically. We show that a rich cluster observed at high redshift has had a
significant... | 1994-04-21 | 2015-06-24 | [
"astro-ph"
] | Guinevere Kauffmann |
astro-ph/9404046 | A Quantitative Analysis of IRAS Maps of Molecular Clouds | We present an analysis of IRAS maps of five molecular clouds: Orion,
Ophiuchus, Perseus, Taurus, and Lupus. For the classification and description
of these astrophysical maps, we use a newly developed technique which considers
all maps of a given type to be elements of a pseudometric space. For each
physical characteri... | 1994-04-20 | 2009-10-22 | [
"astro-ph"
] | Jennifer J. Wiseman and Fred C. Adams |
astro-ph/9404050 | Analysis of the 3d6 4s(6D)4f-5g Supermultiplet of Fe I in Laboratory and
Solar Infrared Spectra | The combined laboratory and solar analysis of the highly-excited
subconfigurations 4f and 5g of Fe I has allowed us to classify 87 lines of the
4f-5g supermultiplet in the spectral region 2545-2585 cm-1. The level structure
of these JK-coupled configurations is predicted by semiempirical calculations
and the quadrupoli... | 1994-04-20 | 2009-10-22 | [
"astro-ph"
] | Johansson, G. Nave, M. Geller, A. J. Sauval, N. Grevesse, W. G.
Schoenfeld, E. S. Chang and C. B. Farmer |
astro-ph/9404044 | Optimized Lagrangian Approximations for Modelling Large--Scale Structure
at Non--Linear Stages | We report on a series of tests of Newtonian Lagrangian perturbation schemes
using N--body simulations for various power--spectra with scale--independent
indices in the range $-3$ to $+1$. The models have been evolved deeply into the
non--linear regime of structure formation in order to probe the dynamical and
statistic... | 1994-04-20 | 2007-05-23 | [
"astro-ph"
] | T. Buchert, A.L. Melott, A.G. Weiss |
astro-ph/9404043 | A new Contribution to Cosmological Perturbations of some Inflationary
Models | We show that there are inflationary models for which perturbations in the
energy momentum tensor, which are of second order in the scalar field, cannot
be neglected. We first specify the conditions under which the usual first order
perturbations are absent. We then analyze classically, the growth and decay of
our new t... | 1994-04-20 | 2009-10-22 | [
"astro-ph",
"gr-qc"
] | R. Durrer and M. Sakellariadou |
astro-ph/9404041 | Numerical analysis of the dynamics of a cosmic string loop as a vortex | Time evolution of a circular cosmic string loop is investigated by
numerically solving the field equations for the scalar and the gauge fields
consisting of the vortex. It is shown that the result agrees with an analytic
estimate based on the Nambu-Goto action, which supports its validity in
analyzing nonstraight and r... | 1994-04-20 | 2009-10-22 | [
"astro-ph"
] | Michiyasu Nagasawa and Jun'ichi Yokoyama |
astro-ph/9404048 | The Age of the Universe, the Hubble Constant and QSOs in a Locally
Inhomogeneous Universe | A local void in the globally Friedmann-Robertson-Walker cosmological model
with the critical density ($\Omega_{0}=1$) is studied. The inhomogeneity is
described using a Lema\^{\i}tre-Tolman-Bondi solution for a spherically
symmetric distribution of matter. The scale of the central underdense region is
$\sim 150$ Mpc. W... | 1994-04-20 | 2008-02-03 | [
"astro-ph",
"gr-qc"
] | J.W.Moffat and D.C.Tatarski |
astro-ph/9404045 | Formal Results Regarding Metric-Space Techniques for the Study of
Astrophysical Maps | We extend a newly developed formal system for the description of
astrophysical maps. In this formalism, we consider the difference between maps
to be the distance between elements of a pseudometric space (the space of all
such maps). This ansatz allows us to measure quantitatively the difference
between any two maps an... | 1994-04-20 | 2009-10-22 | [
"astro-ph"
] | Fred C. Adams and Jennifer J. Wiseman |
astro-ph/9404047 | Gamma Ray Bursts from Interaction of Relativistic Flows with Radiation
Fields | Relativistic flows resulting from sudden explosive events upscatter ambient
interstellar photons of local radiation fields. For Lorentz factor $ > 100$ and
dense optical - UV radiation fields the emergent signal is a typical gamma ray
burst. Presumably the explosions occur in dense globular clusters or in
galactic nucl... | 1994-04-20 | 2015-06-24 | [
"astro-ph"
] | Amotz Shemi |
astro-ph/9404049 | A New Multiplet Table for Fe | We have recorded spectra of iron-neon and iron-argon hollow cathode lamps in
the region 1700A -- 5um (59000 -- 2000cm-1), with Fourier transform (FT)
spectrometers at the National Solar Observatory, Tucson, Arizona, U.S.A. and
Imperial College, London, U.K., and with a high resolution grating spectrograph
at the Nation... | 1994-04-20 | 2007-05-23 | [
"astro-ph"
] | I. G. Nave, S. Johansson, R. C. M. Learner, A. P. Thorne, J. W. Brault |
astro-ph/9404042 | Synthetic and Observed Photometric Indices for Globular Clusters in the
Galaxy and M31 | Buzzoni's (1989) grid of synthetic spectral energy distributions,
representative of old stellar populations, was used to derive colours in
different photometric systems, and to compare the theoretical predictions with
the observational data referring to about $120$ globular clusters in the Galaxy
and to $159$ objects o... | 1994-04-20 | 2007-05-23 | [
"astro-ph"
] | S. Covino, L.E. Pasinetti Fracassini, M.L. Malagnini and A. Buzzoni |
astro-ph/9404039 | Yet Another Model of Soft Gamma Repeaters | We develop a model of SGR in which a supernova leaves planets orbiting a
neutron star in intersecting eccentric orbits. These planets will collide in
$\sim 10^4$ years if their orbits are coplanar. Some fragments of debris lose
their angular momentum in the collision and fall onto the neutron star,
producing a SGR. The... | 1994-04-19 | 2009-10-22 | [
"astro-ph"
] | J. I. Katz, H. A. Toole, S. H. Unruh |
astro-ph/9404040 | The Standard Cosmology | These lectures provide an introductory review of big bang cosmology. I
discuss the expanding Friedmann-Robertson-Walker universe, summarizing the
observational evidence which has led to its adoption as the `standard'
cosmological model and reviewing its basic properties. Subsequent lectures
provide an overview of the e... | 1994-04-19 | 2016-10-26 | [
"astro-ph",
"hep-ph"
] | Josh Frieman |
astro-ph/9404038 | Unsteady Outflow Models for Cosmological Gamma-Ray Bursts | The 'event' that triggers a gamma ray burst cannot last for more than a few
seconds. This is, however, long compared with the dynamical timescale of a
compact stellar-mass object ($\sim 10^{-3}$ seconds). Energy is assumed to be
released as an outflow with high mean lorentz factor $\Gamma$. But a compact
stellar-mass c... | 1994-04-18 | 2009-10-22 | [
"astro-ph"
] | M.J. Rees and P. Meszaros |
astro-ph/9404036 | Measurements of Anisotropy in the Cosmic Microwave Background Radiation
at 0.5 Degree Angular Scales Near the Star Gamma Ursae Minoris | We present results from a four frequency observation of a 6 x 0.6 degree
strip of the sky centered near the star Gamma Ursae Minoris during the fourth
flight of the Millimeter-wave Anisotropy eXperiment (MAX). The observation was
made with a 1.4 degree peak-to-peak sinusoidal chop in all bands. The FWHM beam
sizes were... | 1994-04-18 | 2009-10-22 | [
"astro-ph"
] | M.J. Devlin, A.C. Clapp, J.O. Gundersen, C.A. Hagmann, V.V. Hristov,
A.E. Lange, M.A. Lim, P.M. Lubin, P.D. Mauskopf, P.R. Meinhold, P.L.
Richards, G.F. Smoot, S.T. Tanaka, P.T. Timbie, and C.A. Wuensche |
astro-ph/9404037 | Biased Power Spectrum and Bispectrum for an Ensemble of
Three-Dimensional Scale Free Numerical Simulations | We examine the effect of a threshold bias on the power spectrum and the
bispectrum in an ensemble of numerical simulations (Gaussian initial
perturbations with power law spectra P(k) \sim k^n, n=+1, 0, -1, -2) and
compare our results with theoretical predictions. Our simulations are evolved
sufficiently that on the sca... | 1994-04-18 | 2015-06-24 | [
"astro-ph"
] | J.N. Fry, Adrian L. Melott and Sergei F. Shandarin |
astro-ph/9404035 | Has a Standard Physics Solution to the Solar Neutrino Problem Been
Found? - a Response | In a recent paper Dar and Shaviv (1994) presented results of calculations
with an improved standard solar model (SSM) that suggest a standard physics
solution to the solar neutrino problem. In a subsequent publication with a
similar title Bahcall et al. (1994) have claimed to refute the results obtained
by Dar and Shav... | 1994-04-17 | 2007-05-23 | [
"astro-ph"
] | Arnon Dar and Giora Shaviv |
astro-ph/9404033 | Internal Velocity and Mass Distributions in Clusters of Galaxies for a
Variety of Cosmogonic Models | The mass and velocity distributions in the outskirts ($0.5-3.0h^{-1}$Mpc) of
clusters of galaxies are examined for a suite of cosmogonic models utilizing
large-scale Particle-Mesh (PM) simulations ($500^3$ cells, $250^3$ particles
and box size of $100h^{-1}$Mpc, giving a nominal resolution of $0.2h^{-1}$Mpc
with the tr... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | Renyue Cen (Princeton University Observatory, Princeton, NJ USA) |
astro-ph/9404029 | High Altitude Molecular Clouds | A population of molecular clouds with a significantly greater scale height
than that of Giant Molecular Clouds has been identified by examining maps of
the latitude distribution of the $^{12}CO(1-0)$ emission in the first quadrant
of the Galaxy. These clouds are found by identifying emission more than 2.6
times the sca... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | Sangeeta Malhotra |
astro-ph/9404034 | A Connection between Submillimeter Continuum Flux and Separation in
Young Binaries | We have made sensitive 800-micron continuum observations of low-mass,
pre-main sequence (PMS) binary stars with projected separations less than 25 AU
in Taurus-Auriga to study disks in the young binary environment. We did not
detect any of the observed binaries, with typical 3-sigma upper limits of about
30 mJy. Combin... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | Eric L.N. Jensen, Robert D. Mathieu, and Gary A. Fuller |
astro-ph/9404027 | Observational Prospects for Extra-Galactic Microlensing Events | We consider the feasibility of directly observing gravitational microlensing
in extra-galactic sources, whose stars are not generally resolved. This
precludes use of the simple optical depth to microlensing formulation, which is
applicable only to resolved stars. We, instead, extend this method to consider
observationa... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | Wesley N. Colley |
astro-ph/9404028 | The Vertical Equilibrium of Molecular Gas in the Galactic Disk | We examine the vertical structure and equilibrium of the molecular gas layer
in the galactic disk, measuring its scale height and velocity dispersion as a
function of Galactic radius by modeling the CO emission at the tangent points.
The model takes into account emission from a large path length along the line
of sight... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | Sangeeta Malhotra |
astro-ph/9404026 | Color-Magnitude Diagram Distribution of the Bulge Red Clump Stars -
Evidence for the Galactic Bar | The color-magnitude diagrams of $\sim 5\times 10^5$ stars obtained for 13
fields towards the Galactic bulge with the OGLE project reveal a well-defined
population of bulge red clump stars. We find that the distributions of the
extinction-adjusted apparent magnitudes of the red clump stars in fields lying
at $l=\pm5\deg... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | K.Z. Stanek, M. Mateo, A. Udalski, M. Szymanski, J. Kaluzny, M. Kubiak |
astro-ph/9404030 | The Cosmological Dependence of Cluster Density Profiles | We use N-body simulations to study the shape of mean cluster density and
velocity profiles formed via gravitational instability. The dependence of the
final structure on both cosmology and initial density field is examined, using
a grid of cosmologies and scale-free initial power spectra P\propto k^n. For
each model, w... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | Mary M. Crone, August E. Evrard, and Douglas O. Richstone |
astro-ph/9404031 | Hydrodynamics of Rotating Stars and Close Binary Interactions:
Compressible Ellipsoid Models | We develop a new formalism to study the dynamics of fluid polytropes in three
dimensions. The stars are modeled as compressible ellipsoids and the
hydrodynamic equations are reduced to a set of ordinary differential equations
for the evolution of the principal axes and other global quantities. Both
viscous dissipation ... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | Dong Lai, Frederic A. Rasio, and Stuart L. Shapiro |
astro-ph/9404032 | Momentum Transfer by Astrophysical Jets | We have used 3-D smoothed particle hydrodynamical simulations to study the
basic properties of the outflow that is created by a protostellar jet in a
dense molecular cloud. The dynamics of the jet/cloud interaction is strongly
affected by the cooling in the shocked gas behind the bow shock at the head of
the jet. We sh... | 1994-04-15 | 2009-10-22 | [
"astro-ph"
] | L. Chernin, C. Masson, E.M. Gouveia Dal Pino and W. Benz |
astro-ph/9404025 | Gamma-Rays from Grazing Incidence Cosmic Rays in the Earth's Atmosphere | Interactions of grazing incidence, ultra high energy cosmic rays with the
earth's atmosphere may provide a new method of studying energetic cosmic rays
with gamma-ray satellites. It is found that these cosmic ray interactions may
produce gamma-rays on millisecond time scales which may be detectable by
satellites. An ex... | 1994-04-13 | 2010-11-01 | [
"astro-ph"
] | Andrew Ulmer |
astro-ph/9404023 | Gauge-Invariant Cosmological Perturbations in Generalized Einstein
Theories | Using the covariant approach and conformal transformations, we present a
gauge-invariant formalism for cosmological perturbations in generalized
Einstein theories (GETs), including the Brans-Dicke theory, theories with a
non-minimally coupled scalar field and certain curvature-squared theories. We
find an enhancement i... | 1994-04-12 | 2010-11-01 | [
"astro-ph"
] | Toshinari Hirai and Kei-ichi Maeda |
astro-ph/9404022 | Active Optics and Coronography with the Hubble Space Telescope | In the field of planet and proto-planetary disk detection, achieving high
angular resolution and high dynamic range is a necessity. Coronography coupled
with adaptive optics on Hubble Space Telescope is a way to get both good
spatial resolution and high dynamic range. However, because of the residual
figure errors on t... | 1994-04-12 | 2007-05-23 | [
"astro-ph"
] | Fabien Malbet, Michael Shao and Jeffrey Yu |
astro-ph/9404024 | Inside the Supernova: A Powerful Convective Engine | Condensed Abstract: We present an extensive study of the inception of
supernova explosions by following the evolution of the cores of two massive
stars (15 Msun and 25 Msun) in two dimensions. Our calculations begin at the
onset of core collapse and stop several 100 ms after the bounce, at which time
successful explosi... | 1994-04-12 | 2009-10-22 | [
"astro-ph"
] | Marc Herant, Willy Benz, W. Raphael Hix, Chris F. Fryer, and Stirling
Colgate |
astro-ph/9404021 | Microlensing and Halo Mass in Form of Stars | Paczy\'nski (1986) suggested that ``dark" objects in the halo of our Galaxy
could enhance the luminosity of foreground stars, acting as gravitational
microlenses. Such events has been recently reported by different
collaborations. We assume that these microlensing events are produced by
baryonic objects in the halo of ... | 1994-04-11 | 2007-05-23 | [
"astro-ph"
] | Sergio Campana (Osservatorio astronomico di Brera, Via Brera 28,
Milan, Italy) |
astro-ph/9404018 | Testing Higher--Order Lagrangian Perturbation Theory Against Numerical
Simulations -- 2. Hierarchical Models | We present results showing an improvement of the accuracy of perturbation
theory as applied to cosmological structure formation for a useful range of
scales. The Lagrangian theory of gravitational instability of
Friedmann--Lema\^\i tre cosmogonies investigated and solved up to the third
order in the series of papers by... | 1994-04-08 | 2009-09-25 | [
"astro-ph"
] | A.L. Melott, T. Buchert, A.G. Wei{\ss} |
astro-ph/9404020 | The Motions of Clusters and Groups of Galaxies | The distributions of peculiar velocities of rich clusters and of groups of
galaxies are investigated for different cosmological models and are compared
with observations. Four cosmological models are studied: standard ($\Omega=1$)
CDM, low-density CDM, HDM ($\Omega=1$), and PBI. We find that rich clusters of
galaxies e... | 1994-04-08 | 2007-05-23 | [
"astro-ph"
] | Neta A. Bahcall, Mirt Gramann and Renyue Cen (Princeton University
Observatory, Princeton, NJ) |
astro-ph/9404019 | An Accelerated Lambda Iteration Method for Multilevel Radiative Transfer
III. Noncoherent Electron Scattering | Since the mass of the electron is very small relative to atomic masses,
Thomson scattering of low-energy photons ($h\nu \ll m_ec^2$) produces thermal
Doppler frequency shifts that are much larger than atomic Doppler widths. A
method is developed here to evaluate the electron scattering emissivity from a
given radiation... | 1994-04-08 | 2011-05-23 | [
"astro-ph"
] | G.B. Rybicki and D.G. Hummer |
astro-ph/9404009 | The Amplitude and Spectral Index of the Large Angular Scale Anisotropy
in the Cosmic Microwave Background Radiation | In many cosmological models, the large angular scale anisotropy in the cosmic
microwave background is parameterized by a spectral index, $n$, and a
quadrupolar amplitude, $Q$. For a Peebles-Harrison-Zel'dovich spectrum, $n=1$.
Using data from the Far Infra-Red Survey (FIRS) and a new statistical measure,
a contour plot... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Ken Ganga, Lyman Page, Edward Cheng and Stephan Meyer |
astro-ph/9404014 | A Comparison of Cosmological Hydrodynamic Codes | We present a detailed comparison of the simulation results of various
cosmological hydrodynamic codes. Starting with identical initial conditions
based on the Cold Dark Matter scenario for the growth of structure, we
integrate from redshift $z=20$ to $z=0$ to determine the physical state within
a representative volume ... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Hyesung Kang, Jeremiah P. Ostriker, Renyue Cen, Dongsu Ryu, Lars
Hernquist, August E. Evrard, Greg L. Bryan and Michael L. Norman |
astro-ph/9404016 | Adiabatic Invariants in Stellar Dynamics: II. Gravitational shocking | A new theory of gravitational shocking based on time-dependent perturbation
theory shows that the changes in energy and angular momentum due to a slowly
varying disturbance are not exponentially small for stellar dynamical systems
in general. It predicts significant shock heating by slowly varying
perturbations previou... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Martin D. Weinberg (U. of Massachusetts) |
astro-ph/9404013 | Hot Gas in the CDM Scenario: X-Ray Clusters from a High Resolution
Numerical Simulation | We exmaine the distribution of hot gas in a standard CDM model of the
universe using high resolution hydrodynamic simulations. Adopting standard
parameters determined from COBE and light element nucleosynthesis,
$\sigma_8=1.05$, $\Omega_b=0.06$ and assuming $h=0.5$, we find the X-ray
emitting clusters, compute the lumi... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Hyesung Kang, Renyue Cen, Jeremiah P. Ostriker and Dongsu Ryu
(Princeton University Observatory, Princeton, NJ USA) |
astro-ph/9404011 | A Hydrodynamic Approach to Cosmology: The Mixed Dark Matter Cosmological
Scenario | We compute the evolution of spatially flat, mixed cold and hot dark matter
(``MDM") models containing both baryonic matter and two kinds of dark matter.
The mean final Zeldovich-Sunyaev $y$ parameter is estimated to be $\bar
y=(5.4\pm 2.7)\times 10^{-7}$, with a rms fluctuation of approximately
$\bar{\delta y}=(6.0\pm ... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Renyue Cen and Jeremiah P. Ostriker (Princeton University Observatory,
Princeton, NJ USA) |
astro-ph/9404017 | Adiabatic Invariants in Stellar Dynamics: III. Application to Globular
Cluster Evolution | The previous two companion papers demonstrate that slowly varying
perturbations do not result in adiabatic cutoffs and provide a formalism for
computing the long-term effects of time-dependent perturbations on stellar
systems. Here, the theory is implemented in a Fokker-Planck code and a suite of
runs illustrating the ... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Martin D. Weinberg (U. of Massachusetts) |
astro-ph/9404015 | Adiabatic Invariants in Stellar Dynamics: I. Basic concepts | The adiabatic criterion, widely used in astronomical dynamics, is based on
the harmonic oscillator. It asserts that the change in action under a slowly
varying perturbation is exponentially small. Recent mathematical results
precisely define the conditions for invariance show that this model does not
apply in general. ... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Martin D. Weinberg (U. of Massachusetts) |
astro-ph/9404010 | The Correlation Function of Flux-Limited X-Ray Clusters | We show that the spatial correlation function of a flux-limited sample of
X-ray selected clusters of galaxies will exhibit a correlation scale that is
smaller than the correlation scale of a volume-limited, richness-limited sample
of comparable apparent spatial density. The flux-limited sample contains
clusters of diff... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Neta A. Bahcall and Renyue Cen (Princeton University Observatory,
Princeton, NJ USA) |
astro-ph/9404012 | X-Ray Clusters in a CDM$+\Lambda$ Universe: A Direct, Large-Scale, High
Resolution, Hydrodynamic Simulation | A new, three-dimensional, shock capturing, TVD hydrodynamic code is utilized
to determine the distribution of hot gas in a CDM$+\Lambda$ model universe.
This open model succeeds in matching local observations of clusters in contrast
to the standard $\Omega=1$, CDM model, which fails. It predicts an order of
magnitude d... | 1994-04-07 | 2009-10-22 | [
"astro-ph"
] | Renyue Cen and Jeremiah P. Ostriker (Princeton University Observatory,
Princeton, NJ USA) |
astro-ph/9404006 | On Solar Model Solutions to the Solar Neutrino Problem | Without assuming any solar models and neutrino flavor conversions, $^8$B
neutrinos seen by the Kamiokande experiment should contribute 2.6$\pm 0.45$ SNU
to the chlorine experiment. When this rate is compared with the total event
rate of 2.3$\pm 0.2$ SNU observed by the Homestake experiment which should
inlude a 0.2 SNU... | 1994-04-06 | 2009-09-25 | [
"astro-ph"
] | X. Shi, D. N. Schramm and D. S. P. Dearborn |
astro-ph/9404007 | Wiener Filtering of the COBE DMR Data | We derive an optimal linear filter to suppress the noise from the COBE DMR
sky maps for a given power spectrum. We then apply the filter to the first-year
DMR data, after removing pixels within $20^\circ$ of the Galactic plane from
the data. The filtered data have uncertainties 12 times smaller than the noise
level of ... | 1994-04-06 | 2009-10-22 | [
"astro-ph"
] | Emory F. Bunn, Karl B. Fisher, Yehuda Hoffman, Ofer Lahav, Joseph
Silk, and Saleem Zaroubi |
astro-ph/9404008 | Geminga: A Cooling Superfluid Neutron Star | We show that Geminga's surface temperature can be understood by both types of
neutrino cooling scenarios, i.e, slow neutrino cooling by the modified Urca
process or fast neutrino cooling by the direct Urca process or by some exotic
matter, and thus does not allow us to discriminate between these two competing
schemes. ... | 1994-04-06 | 2009-10-22 | [
"astro-ph",
"nucl-th"
] | Dany Page |
astro-ph/9404004 | Contribution to the local cosmic-ray flux from the Geminga supernova | The contribution to the local cosmic-ray flux from the Geminga supernova is
calculated assuming shock acceleration to 10^14 eV in a remnant which was
formed several 10^5 years ago along with the Geminga pulsar. The particles are
propagated to Earth using a simple diffusion model. In the region below the
knee in the spe... | 1994-04-06 | 2009-10-22 | [
"astro-ph"
] | P. A. Johnson |
astro-ph/9404005 | Velocity Bias in Clusters | Hierarchical gravitational clustering creates galaxies that usually do not
fully share the dynamical history of an average particle in the mass field. In
particular, galaxy tracers identified in numerical simulations can have
individual velocity dispersions in virialized regions a factor \bvs\ lower than
the dark matte... | 1994-04-05 | 2009-10-22 | [
"astro-ph"
] | R.G. Carlberg |
astro-ph/9404003 | The Settling of Warped Disks in Oblate Dark Halos | When a galaxy forms, the disk may initially be tilted with respect to a
flattened dark halo. The misalignment between the disk and the halo is a common
explanation for galactic disk warps, since in this state, disks have precessing
bending modes which resemble real warps. A dubious assumption in this theory is
that the... | 1994-04-05 | 2009-10-22 | [
"astro-ph"
] | John Dubinski and Konrad Kuijken |
astro-ph/9404002 | Has A Standard Model Solution to the Solar Neutrino Problem Been Found? | The claim by Dar and Shaviv that they have found a standard model solution to
the solar neutrino problem is based upon an incorrect assumption made in
extrapolating nuclear cross sections and the selective use of a small fraction
of the nuclear physics and of the neutrino data. In addition, five different
solar model c... | 1994-04-04 | 2007-05-23 | [
"astro-ph"
] | John N. Bahcall, et al |
astro-ph/9404001 | An Optical Interferometer with Wavelength Dispersion | MAPPIT is an optical interferometer installed at the coude focus of the 3.9-m
Anglo-Australian Telescope. The instrument combines non-redundant masking with
wavelength dispersion and is able to record fringes simultaneously over a wide
bandwidth. For typical observations centred near 600 nm, the bandwidth is 55 nm
and ... | 1994-04-04 | 2011-05-23 | [
"astro-ph"
] | T.R. Bedding, J.G. Robertson and R.G. Marson |
astro-ph/9403067 | On Determining the Spectrum of Primordial Inhomogeneity from the COBE
DMR Sky Maps: II. Results of Two Year Data Analysis | A new technique of Fourier analysis on a cut sky (Gorski, 1994) has been
applied to the two year COBE DMR sky maps. The Bayesian power spectrum
estimation results are consistent with the Harrison-Zel'dovich n=1 model. The
maximum likelihood estimates of the parameters of the power spectrum of
primordial perturbations a... | 1994-03-31 | 2009-06-16 | [
"astro-ph"
] | K.M. Gorski, G. Hinshaw, A.J. Banday, C.L. Bennett, E.L. Wright, A.
Kogut, G.F. Smoot & P. Lubin |
astro-ph/9403066 | On Determining the Spectrum of Primordial Inhomogeneity from the COBE
DMR Sky Maps: I. Method | The natural approach to a spectral analysis of data distributed on the sky
employs spherical harmonic decomposition. A common problem encountered in
practical astronomy is the lack of full sky coverage in the available data. For
example, the removal of the galactic plane data from the COBE DMR sky maps
compromises Four... | 1994-03-31 | 2009-10-22 | [
"astro-ph"
] | Krzysztof M. Gorski |
astro-ph/9403065 | Testing the Velocity Field in Non--Scale Invariant Cold Dark Matter
Models | We analyze the cosmic peculiar velocity field as traced by a sample of 1184
spiral, elliptical and S0 galaxies, grouped in 704 objects. We perform a
statistical analysis, by calculating the bulk flow, Cosmic Mach Number and
velocity correlation function for this sample and for mock catalogs extracted
from a set of N--b... | 1994-03-30 | 2009-10-22 | [
"astro-ph"
] | Lauro Moscardini, Giuseppe Tormen, Sabino Matarrese and Francesco
Lucchin |
astro-ph/9403062 | VLA Measurements of a sample of Planetary Nebulae | We report on new radio measurements of Galactic planetary nebulae, aimed at
resolving the controversies on the reliability of older VLA flux densities and
the suggested deviations from the standard Galactic extinction law found for
planetary nebulae. We show that for faint ($<$10 mJy) objects observed at high
angular r... | 1994-03-29 | 2007-05-23 | [
"astro-ph"
] | Stuart Pottasch and Albert Zijlstra |
astro-ph/9403064 | Possible Systematic Decreases in the Age of Globular Clusters | The ages of globular clusters inferred from observations depends sensitively
on assumptions like the initial helium abundance and the mass loss rate. A high
helium abundance (e.g., $Y\approx$0.28) or a mass loss rate of
$\sim$10$^{-11}M_\odot$ yr$^{-1}$ near the main sequence turn-off region lowers
the current age esti... | 1994-03-29 | 2009-09-25 | [
"astro-ph"
] | X. Shi, D. N. Schramm, D. S. P. Dearborn and J. W. Truran |
astro-ph/9403061 | Gravitino Production in the Inflationary Universe and the Effects on
Big-Bang Nucleosynthesis | Gravitino production and decay in the inflationary universe are reexanimed.
Assuming that gravitino mainly decays into photon and photino, we have
calculated the upperbound of the reheating temperature. Compared to previous
works, we have essentially improved the following two points; (i) the helicity
$\pm\frac{3}{2}$ ... | 1994-03-29 | 2009-09-25 | [
"astro-ph"
] | M. Kawasaki and T. Moroi |
astro-ph/9403063 | On the Luminosity Function of Early--Type Galaxies | In a recent paper Loveday et al. (1992) have presented new results on the
luminosity function for a sample of galaxies with $b_J \le 17.15$. After having
morphologically classified each galaxy (early--type, late--type, merged or
uncertain), they have estimated the parameters of a Schechter luminosity
function for early... | 1994-03-29 | 2015-06-24 | [
"astro-ph"
] | Elena Zucca, Lucia Pozzetti and Giovanni Zamorani |
astro-ph/9403059 | A Search for Extragalactic Methanol Masers | A sensitive search for 6.7--GHz methanol maser emission has been made towards
10 galaxies that have yielded detectable microwave molecular--line transitions.
These include several which show OH megamaser or superluminous \water\/ maser
emission. Within the Galaxy, \methanol\/ and OH masers often occur in the same
star ... | 1994-03-28 | 2015-06-24 | [
"astro-ph"
] | S.P.Ellingsen, R.P.Norris, J.B.Whiteoak, R.A.Vaile, P.M.McCulloch and
M.Price |
astro-ph/9403060 | On the Mass of the Dark Compact Objects in the Galactic Disk | Recently the Polish-American collaboration OGLE has reported the observation
of four possible microlensing events by monitoring, over several months, the
brightness of millions of stars in the region of the galactic bulge. If these
events are due to microlensing, the most accurate way to get information on the
mass of ... | 1994-03-28 | 2009-10-22 | [
"astro-ph"
] | Ph. Jetzer |
astro-ph/9403058 | The Structure and Evolution of Lyman-alpha Forest Clouds in the Minihalo
Model | Results are presented for one-dimensional numerical hydrodynamics
computations of the structure and evolution of Lya forest clouds
gravitationally confined by dark matter minihalos. The clouds are developed
from linear perturbations at high redshift and exposed to either a QSO- or
galaxy-dominated metagalactic radiatio... | 1994-03-26 | 2009-10-22 | [
"astro-ph"
] | Avery Meiksin |
astro-ph/9403056 | Light Propagation in Arbitrary Spacetimes and the Gravitational Lens
Approximation | We reformulate the transport equation which determines the size, shape and
orientation of infinitesimal light beams in arbitrary spacetimes. The behaviour
of such light beams near vertices and conjugate points is investigated, with
special attention to the singular behaviour of the optical scalars. We then
specialize t... | 1994-03-24 | 2010-04-06 | [
"astro-ph"
] | Stella Seitz, Peter Schneider, and Juergen Ehlers |
astro-ph/9403055 | Diffuse X-Ray Emission Around High-Redshift, Radio-Loud Qsos | We announce the detection of correlations on angular scales of $\ga10'$
between optically bright, high-redshift, radio-loud QSOs with diffuse X-ray
emission seen by ROSAT in the {\it All-Sky Survey}. These correlations reach
significance levels of up to $99.8\%$. A comparison of the results with a
sample of control fie... | 1994-03-24 | 2007-05-23 | [
"astro-ph"
] | Matthias Bartelmann, Peter Schneider, and Guenther Hasinger |
astro-ph/9403057 | Long-term planetary integration with individual time steps | We describe an algorithm for long-term planetary orbit integrations,
including the dominant post-Newtonian effects, that employs individual
timesteps for each planet. The algorithm is symplectic and exhibits short-term
errors that are $O(\epsilon\Omega^2\tau^2)$ where $\tau$ is the timestep,
$\Omega$ is a typical orbit... | 1994-03-24 | 2009-10-22 | [
"astro-ph"
] | Prasenjit Saha and Scott Tremaine |
astro-ph/9403050 | The Hamburg Quasar Monitoring Program (HQM) at Calar Alto III.
Lightcurves of optically violent variable sources | HQM is an optical broad-band photometric monitoring program carried out since
September 1988. We use a CCD camera at the MPIA 1.2$\,$m telescope. Fully
automatic photometric reduction relative to stars in the frames is done within
a few minutes after each exposure, thus interesting brightness changes can be
followed in... | 1994-03-23 | 2007-05-23 | [
"astro-ph"
] | K.-J. Schramm. U. Borgeest, D.K\"uhl, J. von Linde, M.D. Linnert, T.
Schramm |
astro-ph/9403053 | The Zel'dovich Approximation and the Relativistic Hamilton-Jacobi
Equation | Beginning with a relativistic action principle for the irrotational flow of
collisionless matter, we compute higher order corrections to the Zel'dovich
approximation by deriving a nonlinear Hamilton-Jacobi equation for the velocity
potential. It is shown that the velocity of the field may always be derived
from a poten... | 1994-03-23 | 2015-06-24 | [
"astro-ph",
"gr-qc"
] | D.S. Salopek, J.M. Stewart and K.M. Croudace |
astro-ph/9403047 | Chaos and the Dynamical Evolution of Tidal Capture Binaries in Globular
Clusters | Globular clusters cores harbour many low-mass X-ray binaries, cataclysmic
variables, and millisecond pulsar binaries which are likely to have been formed
via the process of tidal capture. Tidal capture binaries were originally
thought to be responsible for halting core collapse and for subsequent
re-expansion via the p... | 1994-03-23 | 2007-05-23 | [
"astro-ph"
] | Rosemary A. Mardling, (Monash, Australia) |
astro-ph/9403049 | The Hamburg Quasar Monitoring Program (HQM) at Calar Alto. II.
Lightcurves of weakly variable objects | HQM is an optical broad-band photometric monitoring program carried out since
Sept.~1988. We use a CCD camera equipped to the MPIA 1.2$\,$m telescope. Fully
automatic photometric reduction relative to stars in the frames is done within
a few minutes after each exposure, thus interesting brightness changes can be
follow... | 1994-03-23 | 2009-09-25 | [
"astro-ph"
] | K.-J. Schramm, U. Borgeest, D. K\"uhl, J. v. Linde, M.D. Linnert |
astro-ph/9403052 | Advection-Dominated Accretion: A Self-Similar Solution | We consider viscous rotating accretion flows in which most of the viscously
dissipated energy is stored as entropy rather than being radiated. Such
advection-dominated flows may occur when the optical depth is either very small
or very large. We obtain a family of self-similar solutions where the
temperature of the acc... | 1994-03-23 | 2009-10-22 | [
"astro-ph"
] | Ramesh Narayan and Insu Yi |
astro-ph/9403048 | The Hamburg Quasar Monitoring Program (HQM) at Calar Alto. I. Low
amplitude variability in quasars | HQM is an optical broad-band photometric monitoring program carried out since
Sept.~1988. Our main intention is to search for indications of microlensing in
a sample of $\sim$\,100 selected quasars; however, we also want to study the
intrinsic variability. We use a CCD camera equipped to the MPIA 1.2$\,$m
telescope. Fu... | 1994-03-23 | 2008-02-03 | [
"astro-ph"
] | U. Borgeest, K.-J. Schramm |
astro-ph/9403054 | Relaxing the Big-bang Bound to the Baryon Density | In the standard picture of big-bang nucleosynthesis the yields of D, $^3$He,
$^4$He, and $^7$Li only agree with their inferred primordial abundances if the
fraction of critical density contributed by baryons is between $0.01h^{-2}$ and
$0.02h^{-2}$ ($h$ is the present value of the Hubble constant in units of
$100\kms\M... | 1994-03-23 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | G. Gyuk and M.S. Turner |
astro-ph/9403051 | The Orion OB1 Association I. Stellar content | Walraven photometry of established and probable members of the Orion OB1
association is presented. Effective temperature, surface gravity, luminosity
and mass are derived for all stars, using atmosphere models by Kurucz (1979).
Absolute magnitudes are calculated using the Straizys and Kuriliene (1981)
tables. Distance ... | 1994-03-23 | 2009-09-15 | [
"astro-ph"
] | A.G.A. Brown, E.J. de Geus and P.T. de Zeeuw |
astro-ph/9403045 | Null Result in Gamma-Ray Burst Lensed Echo Search | We have searched for gravitational-lens induced echoes between gamma-ray
bursts (GRBs) in NASA's orbiting {\it Compton} Gamma Ray Observatory's Burst
and Transient Source Experiment (BATSE) data. The search was conducted in two
phases. In the first phase we compared all GRBs in a brightness complete sample
of the first... | 1994-03-22 | 2009-10-22 | [
"astro-ph"
] | R.J. Nemiroff (NASA/GMU), W.A.D.T. Wickramasinghe (UPenn), J.P. Norris
(NASA/GSFC), C. Kouveliotou (NASA/USRA), G.J. Fishman (NASA/MSFC), C.A.
Meegan (NASA/MSFC), W.S. Paciesas (NASA/UAH), J.M. Horack (NASA/MSFC) |
astro-ph/9403046 | Modelling of Shallow and Inefficient Convection in the Outer Layers of
the Sun Using Realistic Physics | In an attempt to understand the properties of convective energy transport in
the solar convection zone, a numerical model has been constructed for turbulent
flows in a compressible, radiation-coupled, non-magnetic, gravitationally
stratified medium using a realistic equation of state and realistic opacities.
The time-d... | 1994-03-22 | 2007-05-23 | [
"astro-ph"
] | Yong -Cheol Kim, Peter A. Fox, Sabatino Sofia, and Pierre Demarque |
astro-ph/9403044 | The Evolution of Voids in the Adhesion Approximation | We apply the adhesion approximation to study the formation and evolution of
voids in the Universe. Our simulations -- carried out using 128$^3$ particles
in a cubical box with side 128 Mpc -- indicate that the void spectrum evolves
with time and that the mean void size in the standard COBE-normalised Cold Dark
Matter (... | 1994-03-21 | 2009-10-22 | [
"astro-ph"
] | Varun Sahni, B.S. Sathyaprakash and Sergei F. Shandarin |
astro-ph/9403043 | $^7$Li Abundances in Halo Stars: Testing Stellar Evolution Models and
the Primordial $^7$Li Abundance | A large number of stellar evolution models with [Fe/H] = -2.3 and -3.3 have
been calculated in order to determine the primordial $^7$Li abundance and to
test current stellar evolution models by a comparison to the extensive database
of Li abundances in extremely metal poor halo stars observed by Thorburn
(1994). Standa... | 1994-03-21 | 2009-10-22 | [
"astro-ph"
] | Brian Chaboyer and P. Demarque |
astro-ph/9403042 | The Clustering Properties of IRAS Galaxies | We investigate the clustering of galaxies in the QDOT redshift survey of IRAS
galaxies. We find that the redshift space two-point correlation function is
well approximated by a power-law of slope -1.11+\-0.09, with clustering length
3.87+\-0.32 Mpc/h out to pair separations of 25 Mpc\h. On scales larger than 40
Mpc/h, ... | 1994-03-21 | 2015-06-24 | [
"astro-ph"
] | Ben Moore, Carlos Frenk, George Efstathiou and Will Saunders |
astro-ph/9403040 | Anisotropies of the Cosmic Background Radiation in a Reionized Universe | We trace the evolution of cosmic microwave background photons propagating
through a reionized model universe. The reionization of the intergalactic
medium is achieved by UV photons emitted from the decaying `hot' dark matter
neutrinos. The model universe is represented by a comoving cube through which
we propagate phot... | 1994-03-18 | 2009-10-22 | [
"astro-ph"
] | Robin Tuluie, Richard A. Matzner and Peter Anninos |
astro-ph/9403041 | The Fate of the Magellanic Stream | We show that HI clouds in the Magellanic Clouds are stripped by the
ram-pressure due to the halo and disk gases of the Galaxy. Molecular clouds are
swept to the edge of the LMC, showing an eccentric distribution. The stripped
HI clouds form a narrow band on the sky, and mimics the Magellanic Stream, when
the LMC takes ... | 1994-03-18 | 2007-05-23 | [
"astro-ph"
] | Yoshiaki SOFUE |
astro-ph/9403035 | Kurtosis as a Non--Gaussian Signature of the Large--Scale Velocity Field | We discuss the non--linear growth of the kurtosis of the smoothed peculiar
velocity field (along an arbitrary direction), in an Einstein--de Sitter
universe, induced by Gaussian primordial density fluctuations. Applying the
perturbative theory, we show that, for different cosmological models, a
departure from the origi... | 1994-03-17 | 2008-11-26 | [
"astro-ph"
] | Paolo Catelan and Lauro Moscardini |
astro-ph/9403038 | An Axisymmetric Distribution Function for the Galactic Bulge | We describe a method for parameterizing two-integral distribution functions,
based on triangular tesselations of the integral plane. We apply the method to
the axisymmetric isotropic rotator model for the Galactic bulge of Kent~(1992),
and compare the results with observations of proper motions in Baade's Window,
and w... | 1994-03-17 | 2009-10-22 | [
"astro-ph"
] | Konrad Kuijken |
astro-ph/9403037 | Confrontation of Double-Inflationary Models with Observations | We consider double-inflationary models with two noninteracting scalar fields,
a light scalar field $\phi_l$ with potential $\frac{1}{2}m_l^2\phi_l^2$ and a
heavy scalar field $\phi_h$ with potential $\frac{\lambda}{n}\phi_h^n$ with
$n=2,4$. CDM with the initial spectrum of adiabatic perturbations produced in
these mode... | 1994-03-17 | 2010-12-09 | [
"astro-ph",
"gr-qc"
] | P.Peter, D.Polarski and A.A.Starobinsky |
astro-ph/9403036 | Radio and Infrared Emission from a [WC]-Type Planetary Nebula in the LMC | Radio continuum emission has been detected from a planetary nebula in the
Large Magellanic Cloud: this is the first radio continuum detection for any
planetary nebula outside our galaxy. The radio flux density is a factor of two
lower than predicted from the \hbeta\ flux. This could be due either to a
two-component mor... | 1994-03-17 | 2007-05-23 | [
"astro-ph"
] | Albert A. Zijlstra, Peter A.M. van Hoof, Jessica M. Chapman and Cecile
Loup |
astro-ph/9403039 | On the Origin of Highest Energy Cosmic Rays | In this paper we show that the conventional diffusive shock acceleration
mechanism for cosmic rays associated with relativistic astrophysical shocks in
active galactic nuclei (AGNs) has severe difficulties to explain the highest
energy cosmic ray events. We show that protons above around $2\times10^{20}\eV$
could have ... | 1994-03-17 | 2010-11-01 | [
"astro-ph"
] | G. Sigl, D. N. Schramm and P. Bhattacharjee |
astro-ph/9403034 | "The Contribution of Active Galactic Nuclei to the Diffuse Gamma Ray
Background" | We consider the emission of high energy to very high energy $\gamma$-rays in
radio-quiet active galactic nuclei (AGN) or the central regions of radio-loud
AGN. We use our results to estimate the $\gamma$-ray flux from the central
regions of nearby AGN, and then to calculate the contribution to the diffuse
$\gamma$-ray ... | 1994-03-16 | 2011-05-12 | [
"astro-ph"
] | P.A. Johnson, A. Mastichiadis, R.J. Protheroe, T.S. Stanev and A.P.
Szabo |
astro-ph/9403033 | A Search for X-Ray Bright Distant Clusters of Galaxies | We present the results of a search for X--ray luminous distant clusters of
galaxies. We found extended X--ray emission characteristic of a cluster towards
two of our candidate clusters of galaxies. They both have a luminosity in the
ROSAT bandpass of $\simeq10^{44}{\rm \,erg\,s^{-1}}$ and a redshift of $>0.5$;
thus mak... | 1994-03-15 | 2009-10-22 | [
"astro-ph"
] | R.C.Nichol, M.P.Ulmer, R.G.Kron, G.D.Wirth & D.C.Koo |
astro-ph/9403032 | A Relativistic Approch to Gravitational Instability in the Expanding
Universe: Second Order Lagrangian Solutions | A Lagrangian relativistic approach to the non--linear dynamics of
cosmological perturbations of an irrotational collisionless fluid is
considered. Solutions are given at second order in perturbation theory for the
relevant fluid and geometric quantities and compared with the corresponding
ones in the Newtonian approxim... | 1994-03-15 | 2015-06-24 | [
"astro-ph"
] | S. Matarrese, O. Pantano and D. Saez |
astro-ph/9403031 | Thermal History Constraints on the Isocurvature Baryon Model | We present a thorough and detailed investigation of baryon isocurvature
models including realistic thermal histories, \ie, late or partial reionization
of the universe and compact object formation after standard recombination.
Constraints on these models are imposed from spectral distortion in the cosmic
microwave back... | 1994-03-14 | 2009-07-17 | [
"astro-ph"
] | Wayne Hu and Naoshi Sugiyama |
astro-ph/9403030 | High-Resolution Simulation of Deep Pencil Beam Surveys | We report on a recent paper (Wei\ss\ \& Buchert 1993), where we carry out
pencil beam constructions in a high-resolution simulation of the large-scale
structure of galaxies. As an example we present the results for the case of
``Hot-Dark-Matter" (HDM) initial conditions (with scale-free $n = 1$ power
index on large sca... | 1994-03-14 | 2007-05-23 | [
"astro-ph"
] | A. G. Weiss and T. Buchert |
astro-ph/9403029 | Equations of Gravitational Instability are Non-Local | Few recent generations of cosmologists have solved non-local newtonian
equations of the gravitational instability in an expanding universe. In this
approach pancaking is the predominant form of first collapsing objects.
Relativistic counterparts of these equations contain the electric and magnetic
parts of the Weyl ten... | 1994-03-13 | 2009-10-22 | [
"astro-ph",
"gr-qc",
"hep-th"
] | Lev Kofman (IFA, U. of Hawaii) and Dmitry Pogosayn (CITA) |
astro-ph/9403027 | Doppler Ghosts in a Hall of Mirrors: Polarisation Profiles of Scattered
Emission Lines | The Doppler shifts of optical emission lines which have been scattered by
surrounding dust and electrons can provide useful information about the
kinematics, geometry and physical conditions of astrophysical flows. In
principle, the scatterers can provide views of the line-emitting gas from
different directions, allowi... | 1994-03-12 | 2007-05-23 | [
"astro-ph"
] | W. J. Henney |
astro-ph/9403028 | Properties of the Cosmological Density Distribution Function | The properties of the probability distribution function of the cosmological
continuous density field are studied. We present further developments and
compare dynamically motivated methods to derive the PDF. One of them is based
on the Zel'dovich approximation (ZA). We extend this method for arbitrary
initial conditions... | 1994-03-12 | 2009-10-22 | [
"astro-ph"
] | F. Bernardeau and L. Kofman |
astro-ph/9403023 | Higher--Order Lagrangian Perturbation Theory | Fundamental assumptions which form the basis of models for large-scale
structure in the Universe are sketched in light of a Lagrangian description of
inhomogeneities. This description is introduced for Newtonian self-gravitating
flows. On its basis a Lagrangian perturbation approach is discussed and
compared with the s... | 1994-03-11 | 2009-09-25 | [
"astro-ph"
] | T. Buchert |
astro-ph/9403024 | Statistics of N-Body Simulations. II. Equal Masses after Core Collapse | This paper presents and analyses statistical results from a large number of
$N$-body simulations of isolated systems with equal masses, in which $250\le
N\le 2000$. It concentrates on the phase starting around the end of core
collapse, when binaries start to play a crucial role. Interactions of hard
binaries are consis... | 1994-03-11 | 2015-06-24 | [
"astro-ph"
] | Mirek Giersz and Douglas C. Heggie |
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