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/9309055 | Lagrangian theory of gravitational instability of Friedman-Lemaitre
cosmologies - generic third-order model for non-linear clustering | The Lagrangian perturbation theory on Friedman-Lemaitre cosmologies
investigated and solved up to the second order in earlier papers (Buchert 1992,
Buchert \& Ehlers 1993) is evaluated up to the third order. On its basis a
model for non-linear clustering applicable to the modeling of large-scale
structure in the Univer... | 1993-09-30 | 2015-06-24 | [
"astro-ph"
] | Thomas Buchert |
astro-ph/9309058 | On the Difference between Radio Loud and Radio Quiet AGN | Nuclear jets containing relativistic ``hot'' particles close to the central
engine cool dramatically by producing high energy radiation. The radiative
dissipation is similar to the famous Compton drag acting upon ``cold'' thermal
particles in a relativistic bulk flow. Highly relativistic protons induce
anisotropic show... | 1993-09-30 | 2007-05-23 | [
"astro-ph"
] | Karl Mannheim |
astro-ph/9309053 | The metal systems in Q0000--2619 at high resolution | We have obtained high, 11 and 14 \kms, and medium, 40 and 53 \kms, resolution
spectra of the $z_{em} = 4.11$ quasar Q0000--2619 covering the range 4400 \AA\
to 9265 \AA . We identify nine metal absorption systems, of which four were
previously known. A fifth previously suggested system at $z_{abs} \approx
3.409$ (Turns... | 1993-09-30 | 2011-05-23 | [
"astro-ph"
] | Sandra Savaglio, Sandro D'Odorico, Palle M{\o}ller |
astro-ph/9309054 | Blue perturbation spectra from inflation | We investigate inflationary models leading to density perturbations with a
spectral index $n>1$ (``blue spectra"). These perturbation spectra may be
useful to simultaneously account for both the amount of ultra large-scale power
required to fit cosmic microwave background anisotropies, such as those
measured by COBE, a... | 1993-09-29 | 2010-12-09 | [
"astro-ph"
] | S. Mollerach, S. Matarrese and F. Lucchin |
astro-ph/9309046 | Large-Scale Radio Structuers in the Galactic Center | Radio continuum observations of the galactic center region have revealed a
number of vertical structures running across the galactic plane. Most of the
vertical structures are reasonably attributed either to poloidal magnetic field
or to energy release toward the halo. The relation of the continuum structures
to the mo... | 1993-09-29 | 2007-05-23 | [
"astro-ph"
] | Yoshiaki SOFUE |
astro-ph/9309052 | Possible Gravitational Microlensing of a Star in the Large Magellanic
Cloud | There is now abundant evidence for the presence of large quantities of unseen
matter surrounding normal galaxies, including our own$^{1,2}$. The nature of
this `dark matter' is unknown, except that it cannot be made of normal stars,
dust, or gas, as they would be easily detected. Exotic particles such as
axions, massiv... | 1993-09-29 | 2009-10-22 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | C. Alcock, C.W. Akerlof, R.A. Allsman, T.S. Axelrod, D.P. Bennett, S.
Chan, K.H. Cook, K.C. Freeman, K. Griest, S.L. Marshall, H-S. Park, S.
Perlmutter, B.A. Peterson, M.R. Pratt, P.J. Quinn, A.W. Rodgers, C.W. Stubbs,
W. Sutherland, (The MACHO Collaboration) |
astro-ph/9309050 | A Simulation of the Intracluster Medium with Feedback from Cluster
Galaxies | The formation and evolution of an X--ray cluster is studied using a 3--D
N-body + hydrodynamical simulation which includes feedback of energy and iron
from cluster galaxies. The differences in evolution and final state between the
simulation and a similar run without feedback are highlighted. We address the
energetics ... | 1993-09-29 | 2008-11-26 | [
"astro-ph"
] | Christopher A. Metzler and August E. Evrard |
astro-ph/9309045 | Ram-Pressure Stripping of Gas from Companions and Accretion onto a
Spiral Galaxy: A Gaseous Merger | We simulated the behavior of interstellar gas clouds in a companion galaxy
during a gas-dynamical interaction with the halo and disk of a spiral galaxy.
By ram pressure, the gas clouds are stripped from the companion, and accreted
to ward the disk of the spiral galaxy. If the companion's orbit is retrograde
with respec... | 1993-09-29 | 2009-10-22 | [
"astro-ph"
] | Yoshiaki SOFUE |
astro-ph/9309047 | Face-on Barred Spiral Structure of Molecular Clouds in M31's Bulge | By image processing and color excess analyses of B, V, R, and I-band CCD
images of the central region of M31 taken with the Kiso 105-cm Schmidt
telescope, we found a bar of 200 pc length. We also found a more extended
``face-on" spiral feature of dark clouds, which appear t o be connected to this
bar and is probably an... | 1993-09-29 | 2007-05-23 | [
"astro-ph"
] | Y.Sofue, S.Yoshida, T. Aoki, T. Soyano, M. Hamabe, and K. Wakamatsu |
astro-ph/9309048 | Scrutinizing Supergravity Models through Neutrino Telescopes | Galactic halo neutralinos ($\chi$) captured by the Sun or Earth produce
high-energy neutrinos as end-products of various annihilation modes. These
neutrinos can travel from the Sun or Earth cores to the neighborhood of
underground detectors (``neutrino telescopes") where they can interact and
produce upwardly-moving mu... | 1993-09-29 | 2009-08-25 | [
"astro-ph",
"hep-ph"
] | Raj Gandhi, Jorge L. Lopez, D.V.Nanopoulos, Kajia Yuan, and A.
Zichichi |
astro-ph/9309049 | Confrontation of a Double Inflationary Cosmological Model with
Observations | CDM models with non-scale-free step-like spectra of adiabatic perturbations
produced in a realistic double inflationary model are compared with recent
observational data. The model contains two additional free parameters
relatively to the standard CDM model with the flat ($n=1$) initial spectrum.
Results of the COBE ex... | 1993-09-29 | 2010-12-09 | [
"astro-ph"
] | Stefan Gottloeber, Jan P. Muecket and A. Starobinsky |
astro-ph/9309043 | Comments on Inflationary Cosmology | In this talk we discuss three different issues. First of all, there exist
several proposals how to solve cosmological problems by adiabatic expansion of
the Universe, without any use of inflation. We explain why these models do not
solve the flatness/entropy problem. On the other hand there exist some claims
that infla... | 1993-09-28 | 2007-05-23 | [
"astro-ph"
] | Andrei Linde |
astro-ph/9309041 | Measuring Cosmological Parameters with Cosmic Microwave Background
Experiments | The cosmic microwave background anisotropy is sensitive to the slope and
amplitude of primordial energy density and gravitational wave fluctuations, the
baryon density, the Hubble constant, the cosmological constant, the ionization
history, {\it etc.} In this Letter, we examine the degree to which these
factors can be ... | 1993-09-28 | 2008-11-26 | [
"astro-ph"
] | J. R. Bond, Robert Crittenden, Richard L. Davis, George Efstathiou and
Paul J. Steinhardt |
astro-ph/9309044 | A Family of Models for Spherical Stellar Systems | We describe a one-parameter family of models of stable spherical stellar
systems in which the phase-space distribution function depends only on energy.
The models have similar density profiles in their outer parts ($\rho\propto
r^{-4}$) and central power-law density cusps, $\rho\propto r^{3-\eta}$,
$0<\eta\le 3$. The f... | 1993-09-28 | 2009-10-22 | [
"astro-ph"
] | S. Tremaine. D. O. Richstone, Y.-I. Byun, A. Dressler, S. M. Faber, C.
Grillmair, J. Kormendy, and T. R. Lauer |
astro-ph/9309042 | Why Disks Shine: the Transport of Angular Momentum in Hot, Thin Disks | I review recent work on the radial transport of angular momentum in ionized,
Keplerian accretion disks. Proposed mechanisms include hydrodynamic and MHD
local instabilities and long range effects mediated by wave transport. The most
promising models incorporate the Velikhov-Chandrasekhar instability, caused by
an insta... | 1993-09-28 | 2007-05-23 | [
"astro-ph"
] | E.T. Vishniac |
astro-ph/9309039 | Galaxy Velocity Field in Tilted Cold Dark Matter Models | We study the cosmic peculiar velocity field as traced by a sample of 1184
spiral, elliptical and S0 galaxies, grouped in 704 objects. We carry out a
statistical analysis, by calculating bulk flows and velocity correlation
functions for this sample and for mock catalogs which we extract from N--body
simulations. For the... | 1993-09-27 | 2007-05-23 | [
"astro-ph"
] | F. Lucchin, S. Matarrese, L. Moscardini and G. Tormen |
astro-ph/9309040 | Nonlinear Effects due to the Coupling of Long-Wave Modes | The cosmological fluid equations are used to study the nonlinear mode
coupling of density fluctuations. We find that for realistic cosmological
spectra there is a significant contribution to the nonlinear evolution on
scales of interest to large-scale structure from the long-wave part of the
initial spectrum. A consequ... | 1993-09-27 | 2007-05-23 | [
"astro-ph"
] | Bhuvnesh Jain and Edmund Bertschinger |
astro-ph/9309038 | Do Spirals and Ellipticals Trace the Same Velocity Field? | We test the hypothesis that the velocity field derived from Tully-Fisher
measurements of spiral galaxies, and that derived independently from Dn-sigma
measurements of ellipticals and S0s, are noisy versions of the same underlying
velocity field. The radial velocity fields are derived using tensor Gaussian
smoothing of ... | 1993-09-27 | 2009-10-22 | [
"astro-ph"
] | T. Kolatt and A. Dekel |
astro-ph/9309037 | A Multiwavelength Study of Star Formation in the L1495E Cloud in Taurus | We have carried out a deep (t=30000s) x-ray search of the eastern portion of
the L1495 cloud centered on the well known weak line T Tauri star (WTTS) V410
Tau using the ROSAT PSPC. This deep exposure enabled a search for candidate
pre-main sequence (PMS) objects in this cloud to a limit 20 times more
sensitive than tha... | 1993-09-26 | 2011-02-11 | [
"astro-ph"
] | Karen M. Strom, Stephen E. Strom |
astro-ph/9309036 | Reheating during Hierarchical Clustering in the Universe Dominated by
the Cold Dark Matter | We investigate reheating of the universe by early formation of stars and
quasars in the hierarchical clustering scheme of cold dark matter scenario,
with perturbation fluctuations normalized by the COBE data. It is found that
ionizing uv flux from OB stars with the abundance given by the standard initial
mass function ... | 1993-09-25 | 2015-06-24 | [
"astro-ph"
] | M. Fukugita and M. Kawasaki |
astro-ph/9309035 | Parallel P3M with exact calculation of short range forces | A P3M (Particle-Particle, Particle-Mesh) algorithm to compute the
gravitational force on a set of particles is described. The gravitational force
is computed using Fast Fourier Transforms. This leads to an incorrect force
when the distance between two particles is of the order of a grid cell. This
incorrect force is su... | 1993-09-24 | 2009-10-22 | [
"astro-ph"
] | T. Theuns |
astro-ph/9309034 | The Zero-Point of the Cluster-Cluster Correlation Function: A Key Test
of Cosmological Power Spectra | We propose the zero-point of the cluster-cluster correlation function as a
sensitive test for the shape of the power spectrum of initial fluctuations. It
is now possible to go beyond the power law description to measure the point at
which the correlation function becomes zero. Four independent measurements
indicate tha... | 1993-09-22 | 2009-10-22 | [
"astro-ph"
] | Anatoly Klypin and George Rhee |
astro-ph/9309033 | Testing Models for Structure Formation | I review a number of tests of theories for structure formation. Large-scale
flows and IRAS galaxies indicate a high density parameter $\Omega \simeq 1$, in
accord with inflationary predictions, but it is not clear how this meshes with
the uniformly low values obtained from virial analysis on scales $\sim$ 1Mpc.
Gravita... | 1993-09-21 | 2007-05-23 | [
"astro-ph",
"hep-ph"
] | Nick Kaiser |
astro-ph/9309032 | Supercooling and Nucleation in Phase Transitions of the Early Universe - | The three phase transitions - the GUT, the electro-weak and the quark-hadron,
which the universe is assumed to have undergone produce very important physical
effects if they are assumed to be of first order. It is also important that
enough supercooling is produced at these transitions so that the rate of
nucleation of... | 1993-09-21 | 2015-06-24 | [
"astro-ph",
"hep-ph"
] | B.Banerjee and R. V. Gavai |
astro-ph/9309030 | Spherical Harmonic Reconstruction of Cosmic Density and Velocity Fields | The orthonormal set of Spherical Harmonics provides a natural way of
expanding whole sky redshift and peculiar velocity surveys. | 1993-09-20 | 2009-09-25 | [
"astro-ph"
] | Ofer Lahav |
astro-ph/9309029 | A Spherical Harmonic Approach to Redshift Distortion: Implications for
$\Omega$ and the Power Spectrum | We examine the nature of galaxy clustering in redshift space using a method
based on an expansion of the galaxian density field in Spherical Harmonics and
linear theory. We derive a compact and self-consistent expression for the
distortion when applied to flux limited redshift surveys. The amplitude of the
distortion i... | 1993-09-20 | 2007-05-23 | [
"astro-ph"
] | Karl B. Fisher |
astro-ph/9309031 | Cosmological Parameters from Spherical Harmonic Analyses | In the rest of this volume Lahav and Fisher have presented the method of
Spherical Harmonic Analysis (SHA) and its use in estimating cosmologically
interesting parameters. Here I demonstrate the use of SHA in cross-correlating
galazy catalogues and present an estimate of the ratio of the optical and IRAS
galaxy bias pa... | 1993-09-20 | 2007-05-23 | [
"astro-ph"
] | Caleb. A. Scharf |
astro-ph/9309028 | Determining Omega from Peculiar Velocities | The large-scale dynamics of matter is inferred from the observed peculiar
velocities of galaxies via the POTENT procedure. The smoothed fields of
velocity and mass-density fluctuations are recovered from the current data of
about 3000 galaxies. The cosmological density parameter Omega can then be
constrained in three w... | 1993-09-19 | 2007-05-23 | [
"astro-ph"
] | Avishai Dekel |
astro-ph/9309027 | A Spherical Harmonic Approach to Redshift Distortion and a Measurement
of Omega from the 1.2 Jy IRAS Redshift Survey | We present a formalism for analysing redshift distortions based on a
spherical harmonic expansion of the density field. We use a maximum likelihood
estimator for the combination of density and bias parameters, $\Omega^0.6/b$.
We test the method with $N$-body simulations and apply it to the 1.2 Jy IRAS
redshift survey. | 1993-09-18 | 2015-06-24 | [
"astro-ph"
] | Karl B. Fisher, Caleb A. Scharf, and Ofer Lahav |
astro-ph/9309025 | Astrophysical aspects of fermion number violation in the
supersymmetrical standard model | The model of the supersymmetrical ball in the supersymmetrical standard model
with additional global U(1) fermion symmetry is presented. We show that the
supersymmetry breaking scale ( R-parity ), the global U(1) fermion symmetry
scale and the electroweak symmetry breaking scale are strictly connected to
each other. Th... | 1993-09-17 | 2009-10-22 | [
"astro-ph"
] | R.Manka, I.Bednarek |
astro-ph/9309026 | A Cautionary Note on Gamma Ray Burst Nearest Neighbor Statistics | In this letter we explore the suggestion of Quashnock and Lamb (1993) that
nearest neighbor correlations among gamma ray burst positions indicate the
possibility of burst repetitions within various burst sub-classes. With the aid
of Monte Carlo calculations we compare the observed nearest neighbor
distributions with th... | 1993-09-17 | 2007-05-23 | [
"astro-ph"
] | Michael A. Nowak |
astro-ph/9309023 | The Fourier Space Statistics of Seedlike Cosmological Perturbations | We propose a new test for distinguishing observationally cosmological models
based on seed-like primordial perturbations (like cosmic strings or textures),
from models based on Gaussian fluctuations. We investigate analytically the
{\it Fourier space} statistical properties of temperature or density
fluctuation pattern... | 1993-09-16 | 2015-06-24 | [
"astro-ph",
"hep-ph"
] | Leandros Perivolaropoulos (Harvard-Smithsonian CfA) |
astro-ph/9309024 | Kinematical and Dynamical Approaches to Gravitational Instability | This paper reviews the essential physics of gravitational instability in a
Robertson-Walker background spacetime. Three approaches are presented in a
pedagogical manner, based on (1) the Eulerian fluid equations, (2) the
Lagrangian description of trajectories, and (3) the Lagrangian fluid equations.
Linear and nonlinea... | 1993-09-16 | 2007-05-23 | [
"astro-ph"
] | Edmund Bertschinger |
astro-ph/9309022 | Measuring Bulk Flows in Large Scale Surveys | We follow a formalism presented by Kaiser to calculate the variance of bulk
flows in large scale surveys. We apply the formalism to a mock survey of Abell
clusters \'a la Lauer \& Postman and find the variance in the expected bulk
velocities in a universe with CDM, MDM and IRAS--QDOT power spectra. We
calculate the vel... | 1993-09-15 | 2007-05-23 | [
"astro-ph"
] | Hume A. Feldman and Richard Watkins |
astro-ph/9309020 | Angular Diameters of Compact Planetary Nebulae | We have obtained H$\alpha$ CCD images of 21 compact planetary nebulae in the
galactic bulge. All objects are resolved and, after deconvolving the seeing
disk, we find diameters of 1--2$''$ with typical uncertainties of 20\%. The
values are generally in good agreement with radio measurements but are smaller
than older o... | 1993-09-14 | 2011-05-23 | [
"astro-ph"
] | Timothy R. Bedding and Albert A. Zijlstra |
astro-ph/9309021 | Cosmological Velocity Bias | Velocity bias is a reduction of the velocity dispersion of tracer galaxies in
comparison to the velocity dispersion of the underlying mass field. There are
two distinct forms of velocity bias. The single particle velocity reduction,
$b_v(1)$, is the result of energy loss of a tracer population, and in
virialized region... | 1993-09-14 | 2008-02-03 | [
"astro-ph"
] | Ray Carlberg |
astro-ph/9309018 | Neutrino Process Nucleosynthesis and the $^{11}$B/$^{10}$B Ratio | We consider the evolution of the light elements ($Li, Be$ and $B$)
incorporating the effects of their production by both neutrino process and
cosmic-ray nucleosynthesis. We test the viability of the neutrino process to
resolve the long standing problem of the $^{11}$B/$^{10}$B isotopic ratio which
amounts to 4 at the t... | 1993-09-13 | 2009-09-25 | [
"astro-ph"
] | Keith A. Olive, Nikos Prantzos, Sean Scully, and Elisabeth
Vangioni-Flam |
astro-ph/9309019 | High-order galaxy correlation functions in the APM Galaxy Survey | We estimate J-point galaxy averaged correlation functions $\wbar_J(\theta)$
for $J=2,...,9$, in a sample of the APM Galaxy Survey with more than $1.3
\times 10^6$ galaxies and a depth $ \calD \sim 400 \Mpc$. The hierarchical
amplitudes $s_J=\wbar_J/\wbar_2^{J-1}$ are roughly constant, up to $J=9$,
between $0.5 \Mpc$ an... | 1993-09-13 | 2015-06-24 | [
"astro-ph"
] | Enrique Gaztanaga |
astro-ph/9309017 | Constraints on Chaotic Inflation 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 COBE 53A+B x 90A+B angular correlation function are
obtained using simple... | 1993-09-13 | 2007-05-23 | [
"astro-ph",
"hep-ph"
] | Hannu Kurki-Suonio and Grant Mathews |
astro-ph/9309016 | The Past and Present Infrared Spectrum of BD+30 3639 | We present a radiative-transfer calculation which reproduces the infrared
spectrum of the planetary nebula BD+30$^{\circ}$3639, fitting both the spectral
energy distribution and the spatial extent at infrared wavelengths. We obtain
an acceptable fit to most of the spectrum, including the infrared bands. The
fit require... | 1993-09-13 | 2007-05-23 | [
"astro-ph"
] | Albert A. Zijlstra and Ralf Siebenmorgen |
astro-ph/9309014 | Standard and Non-Standard Plasma Neutrino Emission Revisited | On the basis of Braaten and Segel's representation of the electromagnetic
dispersion relations in a QED plasma we check the numerical accuracy of several
published analytic approximations to the plasma neutrino emission rates. As we
find none of them satisfactory we derive a new analytic approximation which is
accurate... | 1993-09-10 | 2009-10-22 | [
"astro-ph"
] | M. Haft, G. Raffelt, and A. Weiss |
astro-ph/9309015 | A New Radiation Hydrodynamics Code and Application to the Calculation of
Type Ia Supernovae Light Curves and Continuum Spectra | A new, fully dynamic and self-consistent radiation hydrodynamics code,
suitable for the calculation of supernovae light curves and continuum spectra,
is described. It is a multigroup (frequency-dependent) code and includes all
important $O(v/c)$ effects. It is applied to the model W7 of Nomoto,
Thielemann, \& Yokoi (19... | 1993-09-10 | 2009-10-22 | [
"astro-ph"
] | Xiao-he Zhang and Peter Sutherland |
astro-ph/9309013 | On the shape of the light profiles of early-type galaxies | We have obtained the best fit to the light profiles of a luminosity limited
sample of elliptical and S0 galaxies with a power law \rn, letting the exponent
remain free rather than keeping it fixed at $1/n=1/4$ as in the well known \GV
formula. The introduction of a free parameter in the fitting formula (ranging
from $n... | 1993-09-10 | 2015-06-24 | [
"astro-ph"
] | N. Caon, M. Capaccioli and M. D'Onofrio |
astro-ph/9309011 | Gamma-Ray Bursts: Multiwaveband Spectral Predictions for Blast Wave
Models | In almost any scenario for 'cosmological' gamma-ray bursts (and in many
models where they originate in our own Galaxy), the initial energy density is
so large that the resulting relativistic plasma expands with $v\sim c$
producing a blast wave ahead of it and a reverse shock moving into the ejecta,
as it ploughs into t... | 1993-09-09 | 2009-10-22 | [
"astro-ph"
] | P. Meszaros and M.J. Rees |
astro-ph/9309012 | Gamma-Ray Bursts from Blast Waves Around Galactic Nuetron Stars | If gamma-ray bursts originate in our Galaxy, they probably involve violent
disturbances in the magnetospheres of neutron stars. Any event of this kind is
likely to trigger the sudden expulsion of magnetic flux and plasma at
relativistic speed. We show that such ejecta would be braked by the
interstellar medium (ISM), a... | 1993-09-09 | 2016-06-08 | [
"astro-ph"
] | Mitchell C. Begelman, P. Meszaros, and Martin J. Rees |
astro-ph/9309010 | Cavitation of Matter in the Universe into a Degenerated Voronoi Foam | Fluids suspended in expanding laboratory systems cavitate into Voronoi foams
that degenerate through secondary cavitation of the foam walls. This robust
morphological mechanism results from a virtual competition for space between
the cavities. In cosmology, Voronoi foams are known to explain important
features of the l... | 1993-09-09 | 2007-05-23 | [
"astro-ph"
] | T. Norretranders, J. Bohr, and S. Brunak |
astro-ph/9309009 | On the Prediction of Velocity Fields from Redshift Space Galaxy Samples | We present a new method for recovering the underlying velocity field from an
observed distribution of galaxies in redshift space. The method is based on a
kinematic Zel'dovich relation between the velocity and density fields in
redshift space. This relation is expressed in a differential equation slightly
modified from... | 1993-09-08 | 2009-10-22 | [
"astro-ph"
] | Adi Nusser and Marc Davis |
astro-ph/9309008 | Sub-Arcsecond 2D Photometry and Spectrography of the Nucleus of M31: The
Supermassive Black Hole Revisited | Sub-arcsecond imagery (HRCAM, 0".35 - 0".57 FWHM) and two-dimensional
spectrography (TIGER, 0".9 FWHM) of the central nucleus of M31 have been
obtained at CFHT. The photometric data clearly show the double-peaked nucleus,
in excellent agreement with a recent HST image by Lauer et al. 1993. We built
deconvolved surface ... | 1993-09-03 | 2007-05-23 | [
"astro-ph"
] | R. Bacon, E. Emsellem, G. Monnet and J.L. Nieto |
astro-ph/9309007 | Infrared Searches for Dark Matter in the Form of Brown Dwarfs | Brown dwarfs, stars with insufficient mass to burn hydrogen, could contribute
to the dark matter in the Galactic disk, galactic halos or even a background
critical density. We consider the detectability of such brown dwarfs in various
scenarios, extending previous work by allowing for the possibility that they
may have... | 1993-09-02 | 2015-06-24 | [
"astro-ph"
] | E. J. Kerins & B. J. Carr |
astro-ph/9309006 | Implications of MAX for CDM | We analyze the Gamma Ursae Minoris (GUM) and Mu Pegasii (MuP) scans of the
Millimeter-wave Anisotropy eXperiment in the context of cold dark matter (CDM)
models of structure formation, paying particular attention to the
two-dimensional nature of the GUM scan. If all of the structure in the
(foreground subtracted) data ... | 1993-09-01 | 2008-11-26 | [
"astro-ph",
"hep-ph"
] | Mark Srednicki, Martin White, Douglas Scott and Emory T. Bunn |
astro-ph/9309005 | Star counts in NGC 6397 | I-band CCD images of a large area of the nearby globular cluster NGC~6397
have been used to construct a surface density profile and two luminosity and
mass functions. The surface density profile extends out to 14\arcm from the
cluster center and shows no sign of a tidal cutoff. The inner profile is a
power-law with slo... | 1993-09-01 | 2009-10-22 | [
"astro-ph"
] | G. A. Drukier, G. G. Fahlman, H.B. Richer, L. Searle, and I. Thompson |
astro-ph/9309003 | Maximum-Likelihood Analysis of the COBE Angular Correlation Function | We have used maximum-likelihood estimation to determine the quadrupole
amplitude $Q_{\rm rms-PS}$ and the spectral index $n$ of the density
fluctuation power spectrum at recombination from the \cobe\ DMR data. We find a
strong correlation between the two parameters of the form $Q_{\rm
rms-PS}=(15.7\pm 2.6)\exp[0.46(1-n... | 1993-09-01 | 2009-10-22 | [
"astro-ph"
] | Uros Seljak and Edmund Bertschinger |
astro-ph/9309002 | Reconciliation of the Disparate Gamma-Ray Burst Catalogs in the Context
of a Cosmological Source Distribution | It is well known that Gamma-ray Burst spectra often display a break at
energies $\simless 400$ keV, with some exceptions extending to several MeV.\ \
Modeling of a cosmological source population is thus non-trivial when comparing
the catalogs from instruments with different energy windows since this spectral
structure ... | 1993-09-01 | 2009-10-22 | [
"astro-ph"
] | Peter Tamblyn and Fulvio Melia |
astro-ph/9309004 | Formation of spiral and elliptical galaxies in a CDM cosmogony | The formation of galaxies in a CDM cosmogony is investigated by following the
evolution of dark and baryonic matter and of the frequency- dependent spatially
averaged radiation field. The gas is allowed to form stars which are
independently treated as a fourth collisionless component. By supernovae,
energy and metal en... | 1993-09-01 | 2007-05-23 | [
"astro-ph"
] | Matthias Steinmetz and Ewald Mueller |
astro-ph/9308047 | Pre-main sequence lithium burning. I. Weak T Tauri stars | We derive lithium abundances in 53 T Tauri stars (TTS), concentrating on
weak-line TTS. Our study gives the following results: 1)At luminosities $\ge
0.9 L\sun$ the Li abundances are remarkably uniform, with a mean value,
log~N(Li)=3.1, equal to the "cosmic" lithium abundance. 2)Significant Li
depletion appears below 0... | 1993-08-31 | 2019-08-17 | [
"astro-ph"
] | E.L.Martin, R.Rebolo, A.Magazzu, Ya.V.Pavlenko |
astro-ph/9309001 | The Effect of Dissipation on the Shapes of Dark halos | The dissipative infall of gas during the formation of a galaxy modifies the
density profile and shape of the dark halo. Gas dissipates energy radiatively
and sinks to the center of the dark halo forming the luminous part of a galaxy.
The resulting central density enhancement can alter the halo's orbital
distribution. W... | 1993-08-31 | 2009-10-22 | [
"astro-ph"
] | John Dubinski |
astro-ph/9308048 | Are Gamma-Ray Bursts at Cosmological Distances Optically-Thin? | The observed spatial distribution of $\gamma-$ray bursts indicates that they
probably originate at cosmological distances. At this distance scale their
variability timescale and flux above MeV imply an initial optical-depth to pair
production $> 10^{10}$. This appears to be in conflict with their highly
non-thermal spe... | 1993-08-31 | 2010-01-06 | [
"astro-ph"
] | Abraham Loeb |
astro-ph/9308045 | Co Observations of Edge-on Galaxies. IV, NGC 4565: Radial Variation of
the H2-to-Hi Ratio | The edge-on galaxy NGC 4565 has been observed in the 12CO(J=1-0)-line
emission using the Nobeyama 45-m telescope with an angular resolution of 15".
We obtained a scan along the major axis for +/-5' (+/- 15 kpc) about the
galactic center, and some scans perpendicular to the galactic plane. The radial
density distributio... | 1993-08-31 | 2007-05-23 | [
"astro-ph"
] | Y. Sofue and N. Nakai |
astro-ph/9308046 | Gravothermal Expansion in an $N$-Body System | This paper describes the numerical evolution of an $N$-body system with a
slight ``temperature inversion''; i.e. the maximum velocity dispersion occurs
not at the centre but further out. Fluid models predict that the core of such a
system expands on a time-scale of thousands of central relaxation times, and
here this b... | 1993-08-31 | 2015-06-24 | [
"astro-ph"
] | Douglas C. Heggie, Shogo Inagaki and Stephen L.W. McMillan |
astro-ph/9308044 | Reconstructing the Inflaton Potential---Perturbative Reconstruction to
Second Order | One method to reconstruct the scalar field potential of inflation is a
perturbative approach, where the values of the potential and its derivatives
are calculated as an expansion in departures from the slow-roll approximation.
They can then be expressed in terms of observable quantities, such as the
square of the ratio... | 1993-08-30 | 2013-11-13 | [
"astro-ph",
"hep-ph"
] | Edmund Copeland, Edward W. Kolb, Andrew R. Liddle, and James E. Lidsey |
astro-ph/9308043 | Constraints in the Context of Induced-gravity Inflation | Constraints on the required flatness of the scalar potential $V(\phi)$ for a
cousin-model to extended inflation are studied. It is shown that, unlike
earlier results, Induced-gravity Inflation can lead to successful inflation
with a very simple lagrangian and $\lambda \sim 10^{-6}$, rather than
$10^{-15}$ as previously... | 1993-08-28 | 2009-10-22 | [
"astro-ph",
"gr-qc"
] | David I. Kaiser |
astro-ph/9308042 | Dynamically Comptonized Spectra from Near Critical Accretion onto
Neutron Stars | We investigate the effects of dynamical Comptonization on the emergent
radiation spectrum produced by near critical accretion onto a neutron star. The
flow dynamics and the transfer of radiation are self--consistently solved in
the case of a spherically symmetric, ``cold'', pure scattering flow, including
general relat... | 1993-08-27 | 2009-10-22 | [
"astro-ph"
] | Luca Zampieri, Roberto Turolla and Aldo Treves |
astro-ph/9308041 | Constraints on the Strength of a Primordial Magnetic Field from Big Bang
Nucleosynthesis | The effects of magnetic fields on Big Bang Nucleosynthesis(BBN) have been
calculated, and the impact on the abundances of the light elements have been
investigated numerically. An upper limit on the strength of primordial magnetic
fields compatible with observations of light element abundances has been thus
obtained. I... | 1993-08-27 | 2009-12-30 | [
"astro-ph"
] | Baolian Cheng, David N. Schramm, and James W. Truran |
astro-ph/9308040 | A Possible Explanation for the Peculiar Correlations in the Angular
Distribution of Gamma-Ray Bursts | It has been recently discovered that the angular autocorrelation function of
gamma-ray bursts exhibits sharp peaks at angular separations of $\lesssim
4\deg$ (Quashnock and Lamb 1993), and at $\gtrsim 176\deg$ (Narayan and Piran
1993). While an excess of very close pairs of bursts can naturally arise from
burst repetit... | 1993-08-27 | 2016-06-08 | [
"astro-ph"
] | Eyal Maoz |
astro-ph/9308037 | A Polar-Nulceus Dark Lane in the Barred Spiral M83: Three-Dimensional
Accretion in the Nucleus | The central region of the barred spiral galaxy M83 reveals a polar-nucleus
dust lane, wh ich extends from the NE molecular bar and crosses the central
bulge. Its SW counterpart is not visible, being hidden behind the bulge. This
asymmetry, in spite of the galaxy's face-on orientation and the symmetric bar
struct ure in... | 1993-08-27 | 2009-10-22 | [
"astro-ph"
] | Y. Sofue and K. Wakamatsu |
astro-ph/9308039 | Feasibility study of a Superheated Superconducting Granule detector for
cold dark matter search | The presented results are part of a feasibility study of a Super- heated
Superconducting Granule (SSG) device for weakly interacting massive particles
(WIMPs) detection. The sensitivity of SSG to nuclear recoils has been explored
irradiating SSG detectors with a 70Me$\!$V neutron beam proving that energy
thresholds of ... | 1993-08-27 | 2009-09-25 | [
"astro-ph"
] | A. Gabutti, et al |
astro-ph/9308038 | CO versus HI in the Tully-Fisher relation for a sample of 32 galaxies | As a basic step for establishing the CO-line Tully-Fisher relation for
distant galaxies, we made a comparative study of HI versus CO line profiles.
Total line profiles of the CO line emission from 32 galaxies have been compared
with the corresponding HI emission. We found a good correlation between the
profiles of CO a... | 1993-08-27 | 2007-05-23 | [
"astro-ph"
] | F.Schoeniger and Y.Sofue |
astro-ph/9308036 | Co Emission from Molecular Clouds in the Central Region of M31 | We detected \co-line emission from a complex of dark cloud located at about
250 pc from M 31's center, which is the most conspicuous extinction feature
within the central few hund red pc as observed in $B,V,R,I$-band CCD imaging.
The darkest cloud has a 30-pc size, and the virial mass is estimated to be
$\sim 8.7\time ... | 1993-08-27 | 2009-10-22 | [
"astro-ph"
] | Yoshiaki SOFUE, and Shigeomi YOSHIDA |
astro-ph/9308035 | Interaction Rates at High Magnetic Field Strengths and High Degeneracy | In this paper, we have derived the the effects of strong magnetic fields
${\bf \vec B}$ on nucleon and particle reaction rates of astrophysical
significance. We have explored the sensitivity to the presence of arbitrary
degeneracy and polarization. The possible astrophysical applications of our
results are discussed. | 1993-08-26 | 2009-10-22 | [
"astro-ph"
] | Baolian Cheng, David N. Schramm, and James W. Truran |
astro-ph/9308033 | On the Relationship between BL-Lacertae Objects and FRI Radio Galaxies | The idea that Fanaroff-Riley Class~I Radio Galaxies contain core jets with
Lorentz factors of the order of a few and are the parent population for BL~Lac
Objects is examined, with particular reference to the data on two FRI Radio
Galaxies, NGC~315 and NGC~6251. Conservation laws for an entraining
relativistic jet are d... | 1993-08-25 | 2009-10-22 | [
"astro-ph"
] | Geoffrey V. Bicknell |
astro-ph/9308034 | Beamed Radiation in Radio Galaxies | This paper focuses on two aspects of the Physics of Radio Galaxies in which
it has been proposed that relativistic beaming of radiation is necessary to
account for the observations. Physical arguments are presented which show that
it is quite plausible that the jets in FRI radio galaxies are relativistic on
the parsec ... | 1993-08-25 | 2007-05-23 | [
"astro-ph"
] | Geoffrey V. Bicknell |
astro-ph/9308032 | Dynamical Theory of Groups and Clusters of Galaxies | The different dynamical processes (relaxation, dynamical friction, tides and
mergers) operating in groups and clusters are reviewed. The small-scale
substructure observed in clusters is argued to be the remnants of the cores of
rich clusters that merged together, rather than large groups falling into the
cluster. The {... | 1993-08-24 | 2007-05-23 | [
"astro-ph"
] | Gary A. Mamon |
astro-ph/9308031 | The Galactic Center radio jet | Recent observations of the radio and NIR source Sgr A* reinforce the
interpretation of the Galactic Center as a scaled down version of an AGN. The
discovery of an elongated structure at 43 GHz and increasing evidence for the
presence of an accretion disk surrounding a Black Hole lead us to assume that
both, an accretio... | 1993-08-24 | 2011-05-23 | [
"astro-ph"
] | Heino Falcke, Karl Mannheim, Peter L. Biermann |
astro-ph/9308030 | The Galactic Center - an AGN on a starvation diet | The Galactic Center shows evidence for the presence of three important AGN
ingredients: a Black Hole ($M_\bullet\sim10^6M_\odot$), an accretion disk
($10^{-8.5} - 10^{-7} M_\odot/{\rm yr}$) and a powerful jet (jet power $\ge$
10\% disk luminosity). However, the degree of activity is very low and can
barely account for ... | 1993-08-24 | 2007-05-23 | [
"astro-ph"
] | Heino Falcke & Peter L. Biermann |
astro-ph/9308029 | Omega from Velocities in Voids | We propose a method for deriving a dynamical lower bound on $\Omega$ from
diverging flows in low-density regions, based on the fact that large outflows
are not expected in a low-$\Omega$ universe. The velocities are assumed to be
induced by gravity from small initial fluctuations, but no assumptions are made
regarding ... | 1993-08-23 | 2009-10-22 | [
"astro-ph"
] | Avishai Dekel and Martin Rees |
astro-ph/9308027 | Confrontation of the Lauer and Postman Cluster Velocity Field with
Models | The large-scale bulk flow implied by the measurements of distances to
brightest cluster members within 15,000 km/s by Lauer and Postman has the
potential to put strong constraints on, or to even rule out, various models of
large-scale structure. Using PM simulations 400$h^{-1}$ Mpc on a side of five
cosmological models... | 1993-08-20 | 2007-05-23 | [
"astro-ph"
] | Michael Strauss, Renyue Cen, and Jeremiah Ostriker |
astro-ph/9308028 | Tests of the Hubble Law from the Luminosity Function of IRAS Galaxies | All direct measurements of peculiar velocities of glaxies assume the Hubble
law at low redshifts. However, it has been suggested by Segal et al (1993) that
the correlation of redshifts and fluxes in a complete sample of IRAS galaxies
is inconsistent with the Hubble law, and instead implies that redshifts are
proportion... | 1993-08-20 | 2007-05-23 | [
"astro-ph"
] | Michael Strauss and Daniel Koranyi |
astro-ph/9308025 | Errata in \em {Enclyclopedia of Cosmology} | I have noted a number of errors, most of them quite minor, in the {\em
Encyclopedia of Cosmology} (New York and London: Garland), 1993, Norriss S.
Hetherington, ed. The majority occur in my mathematically verbose article,
``Fundamental cosmological parameters". Some errata were passed on to me by
Prof. Ralph Alpher. In... | 1993-08-20 | 2007-05-23 | [
"astro-ph"
] | Kevin Krisciunas (Joint Astronomy Centre, Hilo, Hawaii, USA) |
astro-ph/9308026 | Production of Li, Be \& B from Baryon Inhomogeneous Primordial
Nucleosynthesis | We investigate the possibility that inhomogeneous nucleosynthesis may
eventually be used to explain the abundances of \li6, \be9 and B in population
II stars. The present work differs from previous studies in that we have used a
more extensive reaction network. It is demonstrated that in the simplest
scenario the abund... | 1993-08-20 | 2009-09-15 | [
"astro-ph",
"hep-ph"
] | David Thomas, David N. Schramm, Keith A. Olive, Grant J. Mathews,
Bradley S. Meyer, Brian D. Fields |
astro-ph/9308024 | Cored Apple Bipolarity : A Global Instability to Convection in Radial
Accretion? | We propose that the prevalence of bipolarity in Young Stellar Objects is due
to the fine tuning that is required for spherical accretion of an ambient
medium onto a central node.It is shown that there are two steady modes that are
more likely than radial accretion, each of which is associated with a
hyperbolic central ... | 1993-08-19 | 2015-06-24 | [
"astro-ph"
] | R.N. Henriksen and D. Valls-Gabaud |
astro-ph/9308022 | Can the Dark Matter be $10^6$ Solar Mass Objects? | If the dark matter in galactic halos is made up of compact, macroscopic
objects (MO), such as black holes with $M_\MO >>M_{stars}$, gravitational
scattering will lead to kinematic heating of the stars. Observational
constraints on the amount of heating in the disk of the Milky Way put upper
limits on $M_\MO \ltorder 10... | 1993-08-17 | 2009-10-22 | [
"astro-ph"
] | Hans-Walter Rix and George Lake |
astro-ph/9308023 | A Neutral Hydrogen Survey of Polar-Ring Galaxies: I. Green Bank
Observations of the Northern Sample | We present the results of a neutral hydrogen survey conducted with the Green
Bank 140-foot radio telescope of 47 northern objects in the polar-ring galaxy
atlas of Whitmore \etal\ (1990). We detected 39 of these above our detection
limit of 1.7 \hbox{Jy\CDOT\KMS}; the average measured flux of 21 Jy\CDOT\KMS\
correspond... | 1993-08-17 | 2008-11-26 | [
"astro-ph"
] | O.-G. Richter, P.D. Sackett and L.S. Sparke |
astro-ph/9308021 | Are SP91 and COBE Inconsistent with Cold Dark Matter? | We present results on the consistency of standard cold dark matter (CDM)
models with both the COBE normalization and the data from the 4th channel of
the 9-point South Pole scan. We find that CDM models are consistent with both
experiments, a conclusion which is at odds with some other analyses. This is
partly due to o... | 1993-08-17 | 2008-11-26 | [
"astro-ph",
"hep-ph"
] | E. Bunn, M. White, M. Srednicki, and D. Scott |
astro-ph/9308020 | The Optical Polarization Properties of X-ray Selected BL Lacertae
Objects | We discuss the optical polarization properties of X-ray selected BL Lacertae
objects (XSBLs) as determined from three years of monitoring 37 BL Lac objects
and candidates. The observed objects include a complete X-ray flux limited
sample drawn from the EMS Survey. The majority of the XSBLs classi- fied solely
on the ap... | 1993-08-16 | 2009-10-22 | [
"astro-ph"
] | B.T. Jannuzi, P.S. Smith & R. Elston |
astro-ph/9308019 | Re-Ionization and its Imprint on the Cosmic Microwave Background | Early reionization changes the pattern of anisotropies expected in the cosmic
microwave background. To explore these changes, we derive from first principles
the equations governing anisotropies, focusing on the interactions of photons
with electrons. Vishniac (1987) claimed that second order terms can be large in
a re... | 1993-08-16 | 2009-10-22 | [
"astro-ph"
] | Scott Dodelson and Jay Jubas |
astro-ph/9308018 | Why is the Temperature of the Universe 2.726K? | NASA's Cosmic Background Explorer (COBE) Satellite has recently made the most
accurate measurement of the temperature of the Universe determining it to be
$2.726\pm 0.01\,$K. In trying to understand why the temperature has this value,
one is led to discover the most fundamental features of the Universe---an
early, radi... | 1993-08-13 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | M.S. Turner (U. Chicago/Fermilab) |
astro-ph/9308017 | The large-scale structure in a universe dominated by cold plus hot dark
matter | Using numerical simulations, we investigate the large-scale gravitational
clustering in a flat universe dominated by cold plus hot dark matter (i.e.,
$\Omega_0=\ocdm+\ohdm+\obaryon=1$). Primordial density fluctuation spectrum is
taken to have the Zel'dovich-Harrison form. Three models are studied, with
Model I having $... | 1993-08-12 | 2010-12-09 | [
"astro-ph"
] | Y.P. Jing, H.J. Mo, G. Boerner, L.Z. Fang |
astro-ph/9308016 | Does Dissipation in AGN Disks Couple to the Total Pressure? | Recent work on the transport of angular momentum in accretion disks suggests
that the Velikhov-Chandrasekhar instability, in which a large scale magnetic
field generates small scale eddys in a shearing environment, may be ultimately
responsible for this process. Although there is considerable controversy about
the orig... | 1993-08-12 | 2007-05-23 | [
"astro-ph"
] | E.T. Vishniac |
astro-ph/9308015 | A Unique Mass Function from Galaxies to Clusters ? | We present an observational mass function ranging from galaxies to massive
galaxy clusters, derived from direct dynamical mass estimates. Our mass
function shows, in the low-mass range of galaxies and groups, a behaviour in
agreement with that of standard CDM (n=-2), while in the high-mass range
(clusters) our mass fun... | 1993-08-11 | 2007-05-23 | [
"astro-ph"
] | G.Giuricin, F.Mardirossian, M.Mezzetti, M.Persic, P.Salucci |
astro-ph/9308014 | Boson Stars in the Brans-Dicke Gravitational Theories | Boson stars consist of a system of self-gravitating scalar fields which form
a macroscopic quantum state and are a possible dark matter candidate. In this
paper, we address the existence of boson stars in Brans-Dicke gravity. We show
that solutions to the equations of motion of a boson star in Brans-Dicke
gravity exist... | 1993-08-10 | 2009-10-22 | [
"astro-ph",
"gr-qc"
] | Mark A. Gunderson and Lars Gerhard Jensen |
astro-ph/9308012 | Weakly Non-Linear Gaussian Fluctuations and the Edgeworth Expansion | We calculate the cosmological evolution of the 1-point probability
distribution function (PDF), using an analytic approximation that combines
gravitational perturbation theory with the Edgeworth expansion of the PDF. Our
method applies directly to a smoothed mass density field or to the divergence
of a smoothed peculia... | 1993-08-09 | 2009-10-22 | [
"astro-ph"
] | R. Juszkiewicz, D. Weinberg, P. Amsterdamski, M. Chodorowski & F.
Bouchet |
astro-ph/9308013 | Clustering in the 1.2 Jy IRAS Galaxy Redshift Survey II: Redshift
Distortions and \xi(r_p,\pi) | We examine the effect of redshift space distortions on the galaxy two-point
correlation function $\xi(r_p,\pi)$ as a function of separations parallel
($r_p$) and perpendicular ($\pi$) to the line of sight. We find that the
relative velocity dispersion of pairs of IRAS galaxies is $\sigma(r)=
317^{+40}_{-49}$ \kms at $r... | 1993-08-09 | 2015-06-24 | [
"astro-ph"
] | Karl B Fisher, Marc Davis, Michael A Strauss, Amos Yahil, John P
Huchra |
astro-ph/9308011 | On the probability of major-axis precession in triaxial ellipsoidal
potentials | Orbits in triaxial ellipsoidal potentials precess about either the major or
minor axis of the ellipsoid. In standard perturbation theory it can be shown
that a circular orbit will precess about the minor axis if its angular momentum
vector lies in a region bounded by two great circles which pass through the
intermediat... | 1993-08-09 | 2015-06-24 | [
"astro-ph"
] | P. A. Thomas, S. Vine and F. R. Pearce |
astro-ph/9308008 | Testing the Frozen-Flow Approximation | We investigate the accuracy of the frozen--flow approximation (FFA), recently
proposed by Matarrese \etal (1992), for following the nonlinear evolution of
cosmological density fluctuations under gravitational instability. We compare a
number of statistics between results of the FFA and nbody simulations,
including thos... | 1993-08-06 | 2015-06-24 | [
"astro-ph"
] | Adrian L. Melott, Francesco Lucchin, Sabino Matarrese and Lauro
Moscardini |
astro-ph/9308010 | Atmospheric Models of Flare Stars: The Quiescent State of Ad Leo | We compute a semi-empirical atmospheric model for the dMe star AD Leo, which
constitutes the first model computed to match the continuum observations, as
well as a wide set of chromospheric spectral lines. We find good agreement
between the computed and observed spectral features, with the exception of the
Ca II K line... | 1993-08-06 | 2007-05-23 | [
"astro-ph"
] | P. Mauas and A. Falchi |
astro-ph/9308009 | Our Galactic Center: A laboratory for the feeding of AGNs? | We demonstrate that our Galactic Center, despite little evidence for the
presence of a currently active nucleus, provides insight into the feeding of
AGN: The observed velocity field of molecular clouds can be interpreted as
tracing out the spiralling inwards of gas in a large accretion flow towards the
Galactic Center... | 1993-08-06 | 2007-05-23 | [
"astro-ph"
] | Susanne von Linden, Peter L. Biermann, Wolfgang J. Duschl, Harald
Lesch, and Thomas Schmutzler |
astro-ph/9308007 | Do Gamma-Ray Burst Sources Repeat | Following the discovery by Quashnock and Lamb (1993) of an apparent excess of
$\gamma$-ray burst pairs with small angular separations, we reanalyze the
angular distribution of the bursts in the BATSE catalogue. We find that in
addition to an excess of close pairs, there is also a comparable excess of
antipodal bursts, ... | 1993-08-05 | 2016-06-08 | [
"astro-ph"
] | Ramesh Narayan and Tsvi Piran |
astro-ph/9308004 | Dust-Radiation Universes: Stability Analysis | Flat and open universe models are considered, containing a mixture of cold
matter (dust) and radiation interacting only through gravity, with the aim of
studying their stability with respect to linear scalar perturbations. To this
end the perturbed universe is considered as a dynamical system, described by
coupled diff... | 1993-08-04 | 2015-06-24 | [
"astro-ph"
] | Marco Bruni and Kamilla Piotrkowska |
astro-ph/9308002 | Kurtosis and Large--Scale Structure | We discuss the non--linear growth of the excess kurtosis parameter of the
smoothed density fluctuation field $\delta$,
$S_4\equiv[\lan\delta^{\,4}\ran-3\lan\delta^{\,2}\ran^2]/
\lan\delta^{\,2}\ran^3$ in an Einstein--de Sitter universe. We assume Gaussian
primordial density fluctuations with scale--free power spectrum ... | 1993-08-04 | 2009-10-22 | [
"astro-ph"
] | Paolo Catelan and Lauro Moscardini |
astro-ph/9308005 | The Sign of Four: A new class of cool non-radially pulsating stars? | In this paper we discuss four early F-type variable stars whose periods are
an order of magnitude slower than known pulsators of comparable luminosity.
They cannot be stars undergoing simple radial pulsations. For one or more of
these stars we can discount the possibility that the variability is due to
rotational modul... | 1993-08-04 | 2007-05-23 | [
"astro-ph"
] | Kevin Krisciunas |
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