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 |
|---|---|---|---|---|---|---|
alg-geom/9301001 | Lines on Calabi Yau complete intersections, mirror symmetry, and Picard
Fuchs equations | A relation between the number of rational curves of fixed degree on Calabi
Yau threefolds and the Picard Fuchs equations, which was suggested as part of
the study of mirror symmetry, is verified in the case of complete intersection
of two cubics and lines. | 1993-01-04 | 2008-02-03 | [
"alg-geom",
"math.AG"
] | A.Libgober and J.Teitelbaum |
astro-ph/9312065 | Inhomogeneous Primordial Nucleosynthesis: Coupled Nuclear Reactions and
Hydrodynamic Dissipation Processes | We present a detailed study of inhomogeneous Big Bang nucleosynthesis where,
for the first time, nuclear reactions are coupled to all significant
fluctuation dissipation processes. Theses processes include neutrino heat
transport, baryon diffusion, photon diffusive heat transport, and hydrodynamic
expansion with photon... | 1993-12-30 | 2009-10-22 | [
"astro-ph"
] | K. Jedamzik, G.M. Fuller, and G.J. Mathews |
astro-ph/9312066 | Enhanced Heavy-Element Formation in Baryon-Inhomogeneous Big-Bang Models | We show that primordial nucleosynthesis in baryon inhomogeneous big-bang
models can lead to significant heavy-element production while still satisfying
all the light-element abundance constraints including the low lithium abundance
observed in population II stars. The parameters which admit this solution arise
naturall... | 1993-12-30 | 2009-10-22 | [
"astro-ph"
] | K. Jedamzik, G.M. Fuller, G.J. Mathews, and T. Kajino |
astro-ph/9312064 | Can Conformal Weyl Gravity be Considered a Viable Cosmological Theory? | We present exact analytical solutions to the Conformal Weyl Gravity
cosmological equations that are valid for both the matter and radiation
dominated eras. The Primordial Nucleosynthesis process is also exhaustively
studied. The main conclusion of our work is that cosmological models derived
from this theory are not li... | 1993-12-29 | 2009-10-22 | [
"astro-ph"
] | D. Elizondo and G. Yepes |
astro-ph/9312063 | The Evolution of Non-Linear Sub-Horizon Scale Entropy Fluctuations in
the Earlu Universe | We examine the damping of non-linear sub-horizon scale entropy fluctuations
in early epochs of the universe ($T\approx 100$ GeV to $T\approx 1$keV) by
neutrino, baryon, and photon induced dissipative processes. Results of
numerical evolution calculations are presented for broad ranges of initial
fluctuation amplitudes ... | 1993-12-28 | 2009-10-22 | [
"astro-ph"
] | K. Jedamzik and G.M. Fuller |
astro-ph/9312062 | Primordial Nucleosynthesis with a Decaying Tau Neutrino | A comprehensive study of the effect of an unstable tau neutrino on primordial
nucleosynthesis is presented. The standard code for nucleosynthesis is modified
to allow for a massive decaying tau neutrino whose daughter products include
neutrinos, photons, $e^\pm$ pairs, and/or noninteracting (sterile) daughter
products.... | 1993-12-28 | 2008-11-26 | [
"astro-ph",
"hep-ph"
] | S. Dodelson, G. Gyuk, and M.S. Turner |
astro-ph/9312061 | Glitches in the X-Ray Pulsar 1e 2259+586 | Starquakes are considered for fast-rotating magnetic white dwarfs. The X-ray
pulsar 1E 2259 + 586 may be such a white dwarf. It is shown that in this case
starquakes may be responsible for the decrease of the mean spin-down rate which
was observed for 1E 2259 + 586 between 1987 and 1990. The required mass of the
white ... | 1993-12-27 | 2009-10-22 | [
"astro-ph"
] | Vladimir V. Usov |
astro-ph/9312059 | Gravitational Microlensing by the MACHOs of the LMC | The expected microlensing events of the LMC by the MACHOs of the LMC itself
are calculated and compared with analogue events by objects in the Galactic
halo. The LMC matter distribution is modelled by a spherical halo and an
exponential disk while a face-on exponential disk is used for the stellar
distribution of the L... | 1993-12-24 | 2009-10-22 | [
"astro-ph"
] | Xiang-Ping Wu |
astro-ph/9312060 | Galaxy-cluster associations from gravitational lensing | We investigate the associations between background galaxies and foreground
clusters of galaxies due to the effect of gravitational lensing by clusters of
galaxies. Similar to the well-known quasar-galaxy ones, these associations
depend sensitively on the shape of galaxy number-magnitude or number-flux
relation, and bot... | 1993-12-24 | 2011-05-23 | [
"astro-ph"
] | Xiang-Ping Wu and Francois Hammer |
astro-ph/9312058 | A further discussion on quasar-galaxy associations from gravitational
lensing | Quasar-galaxy associations, if they result from the effect of gravitational
lensing by foreground galaxies, depend sensitively on the shape of the quasar
number counts. Two kinds of quasar number-magnitude relations are predicted to
produce quite different properties in quasar-galaxy associations: the counts of
Boyle, ... | 1993-12-24 | 2011-05-23 | [
"astro-ph"
] | Xiang-Ping Wu |
astro-ph/9312057 | Anisotropies of Cosmic Background Radiation from a Local Collapse | We present an exact solution of the anisotropies of cosmic background
radiation (CBR) from a local collapse described by a spherical over-dense
region embedded in a flat universe, with the emphasis on the relationship
between the dipole $(\Delta {\sf T}/{\sf T})_d$ and the quadrupole $(\Delta
{\sf T}/{\sf T})_q$ anisot... | 1993-12-24 | 2009-10-22 | [
"astro-ph"
] | Xiang-Ping Wu and Li-Zhi Fang |
astro-ph/9312056 | Dipole Anisotropy in the COBE DMR First-Year Sky Maps | We present a determination of the cosmic microwave background dipole
amplitude and direction from the COBE Differential Microwave Radiometers (DMR)
first year of data. Data from the six DMR channels are consistent with a
Doppler-shifted Planck function of dipole amplitude Delta T = 3.365 +/-0.027 mK
toward direction (l... | 1993-12-23 | 2009-10-22 | [
"astro-ph"
] | A. Kogut, C. Lineweaver, G.F. Smoot, C. L. Bennett, A. Banday, et al |
astro-ph/9312054 | The Role of Chaos in the Circularization of Tidal Capture Binaries. II.
Long-Term Evolution | A self-consistent, adiabatic model for the {\it long-time} behaviour of tidal
capture binaries is presented. It is shown that most capture orbits behave
chaotically, with the eccentricity following a quasi-random walk between the
values of $\appless 1$ and some lower limit associated with the periastron
separation at c... | 1993-12-22 | 2007-05-23 | [
"astro-ph"
] | Rosemary A. Mardling, (Monash, Australia) |
astro-ph/9312055 | The Variance of QSO Counts in Cells | {}From three quasar samples with a total of 1038 objects in the redshift
range $1.0 \div 2.2$ we measure the variance $\sigma^2$ of counts in cells of
volume $V_u$. By a maximum likelihood analysis applied separately on these
samples we obtain estimates of $\sigma^2(\ell)$, with $\ell \equiv V_u^{1/3}$.
The analysis fr... | 1993-12-22 | 2009-10-22 | [
"astro-ph"
] | P. Andreani, S. Cristiani, F. Lucchin, S. Matarrese and L. Moscardini |
astro-ph/9312053 | The Role of Chaos in the Circularization of Tidal Capture Binaries. I.
the Chaos Boundary | A self-consistent model for binary evolution devised by Gingold \& Monaghan
(1980) is used to show that two distinctly different types of behaviour are
possible for close eccentric binaries. The model is based on a linear adiabatic
normal mode analysis of the problem, which allows detailed examination of the
transfer o... | 1993-12-22 | 2007-05-23 | [
"astro-ph"
] | Rosemary A. Mardling, (Monash, Australia) |
astro-ph/9312049 | Detection of Signature Consistent with Cosmological Time Dilation in
Gamma-Ray Bursts | If gamma-ray bursters are at cosmological distances - as suggested by their
isotropic distribution on the sky and by their number-intensity relation - then
the burst profiles will be stretched in time, by an amount proportional to the
redshift, 1 + $z$. We have tested data from the {\it Compton} Gamma Ray
Observatory's... | 1993-12-21 | 2009-10-22 | [
"astro-ph"
] | J. P. Norris (NASA/GSFC), R. J. Nemiroff (NASA/GMU), J. D. Scargle
(NASA/AMES), C. Kouveliotou (NASA/USRA), G. J. Fishman (NASA/MSFC), C. A.
Meegan (NASA/MSFC), W. S. Paciesas (NASA/UAH), J. T. Bonnell (NASA/CSC) |
astro-ph/9312051 | Synthetic metal line indices for elliptical galaxies from super metal
rich alpha-enhanced stellar models | There are strong indications from recent papers (e.g. Worthey et al. 1992)
that the abundance ratio of Mg/Fe, and consequently also O/Fe in giant
elliptical galaxies is not solar. The line strengths of two Fe lines at 5270
and 5335 A are weaker than one expects from the strength of the Mg b line if
[Mg/Fe] = 0. We have... | 1993-12-21 | 2007-05-23 | [
"astro-ph"
] | A. Weiss, R.F. Peletier and F. Matteucci |
astro-ph/9312050 | On the Mass of the Dark Compact Halo Objects | Recently the French EROS collaboration and the American-Australian MACHO
collaboration have reported the observation of altogether three possible
microlensing events by monitoring over several years the brightness of millions
of stars in the Large Magellanic Cloud. For each of these events, assuming they
are due to mic... | 1993-12-21 | 2009-10-22 | [
"astro-ph"
] | Philippe Jetzer and Eduard Masso (Zurich Univ.) |
astro-ph/9312052 | On the Location of the Acceleration and Emission Sites in Gamma-Ray
Blazars | Compton scattering of external radiation by nonthermal particles in
outflowing blazar jets is dominated by accretion-disk photons rather than
scattered radiation to distances $\sim 0.01-0.1$ pc from the central engine for
standard parameters, thus clarifying the limits of validity of the model by the
present authors an... | 1993-12-21 | 2007-05-23 | [
"astro-ph"
] | Charles D. Dermer and Reinhard Schlickeiser |
astro-ph/9312048 | Radiation from Vela-Like Pulsars Near the Death Line | Radiation of both the outer gaps and the neutron star surface is considered
for a Vela-like pulsar near the death line. It is shown that if such a pulsar
is close enough to the death line, its optical, UV and X-ray emission has to
increase. Using results of this consideration, it is argued that Geminga is not
a close r... | 1993-12-20 | 2009-10-22 | [
"astro-ph"
] | Vladimir V. Usov |
astro-ph/9312047 | Can EROS/MACHO be detecting the galactic spheroid instead of the
galactic halo? | Models of our galaxy based on dynamical observations predict a spheroid
component much heavier than accounted for by direct measurements of star counts
and high velocity stars. If, as first suggested by Caldwell and Ostriker, this
discrepancy is due to a large population of faint low-mass stars or dark
objects in the s... | 1993-12-19 | 2010-11-30 | [
"astro-ph",
"hep-ph"
] | G.F. Giudice, S. Mollerach, and E. Roulet |
astro-ph/9312046 | The Very-Soft X-Ray Emission of X-Ray Faint Early-Type Galaxies | A recent re-analysis of Einstein data, and new ROSAT observations, have
revealed the presence of at least two components in the X-ray spectra of X-ray
faint early-type galaxies: a relatively hard component (kT>1.5 keV), and a very
soft component (kT\sim 0.2-0.3 keV). We address the problem of the nature of
the very sof... | 1993-12-19 | 2010-12-13 | [
"astro-ph"
] | S.Pellegrini and G. Fabbiano |
astro-ph/9312045 | Very High Energy Gamma-Rays from AGN: Cascading on the Cosmic Background
Radiation Fields and the Formation of Pair Halos | Recent high energy gamma-ray observations (E>100 MeV) of blazar AGN show
emission spectra with no clear upper energy cutoff. AGN, considered to be
possible sources for the highest energy cosmic rays, may have emission
extending well into the VHE (very high energy, E>100 GeV) domain. Because VHE
gamma-rays are absorbed ... | 1993-12-18 | 2019-08-17 | [
"astro-ph"
] | F.A. Aharonian, P.S. Coppi, H.J. Voelk |
astro-ph/9312044 | Optimizing the Zel'dovich Approximation | We have recently learned that the Zeldovich approximation can be successfully
used for a far wider range of gravitational instability scenarios than formerly
proposed; we study here how to extend this range. In previous work we studied
the accuracy of several analytic approximations to gravitational clustering in
the m... | 1993-12-18 | 2015-06-24 | [
"astro-ph"
] | A.L. Melott, T.F. Pellman, and S.F. Shandarin |
astro-ph/9312042 | Spectroscopy of Dwarf Elliptical Galaxies in the Fornax Cluster | We present the results of spectroscopic observations of 10 nucleated dwarf
elliptical galaxies (dE's) in the Fornax cluster. The blue spectra of Fornax dE
galaxies indicate a wide range of metallicities at a given luminosity, similar
to those of intermediate to \it metal-rich globular clusters. Metal abundances
derived... | 1993-12-17 | 2009-10-22 | [
"astro-ph"
] | Enrico V. Held and Jeremy R. Mould |
astro-ph/9312041 | CO Observations of Edge-on Galaxies, V. NGC 5907: Central Deficiency of
Gas in an Sc Galaxy - Merger in the Bulge | The edge-on Sc galaxy NGC 5907 has been observed in the 12CO(1-0)-line
emission using the Nobeyama 45-m telescope. The radial density distribution
between 2 and 13 kpc is well represented by a superposition of an
exponential-law disk of scale radius 3.5 kpc and a ring of 7 kpc radius.
However, no concentration of gas h... | 1993-12-17 | 2007-05-23 | [
"astro-ph"
] | Yoshiaki SOFUE |
astro-ph/9312040 | Anisotropy in the Angular Broadening of Sgr A$^*$ at the Galactic Center | We present the results of a $\lambda$20 cm VLA observation of the compact
Galactic center radio source Sgr A$^*$. The scatter-broadened image is
elongated in the East-West direction, with an axial ratio of 0.6$\pm$0.05 and a
position angle of 87$^0\pm$3$^0$. A similar shape and orientation has been
found previously at ... | 1993-12-17 | 2007-05-23 | [
"astro-ph"
] | F. Yusef-Zadeh W. Cotton M. Wardle F. Melia and D. Roberts |
astro-ph/9312043 | Can MACHOs Probe the Shape of the Galaxy Halo? | We study the prospects for the current microlensing searches, which have
recently discovered several candidates, to yield useful information about the
flattening of the Galaxy dark matter halo. Models of HI warps and N-body
simulations of galaxy formation suggest that disks commonly form in oblate
halos with a tilt bet... | 1993-12-17 | 2009-10-22 | [
"astro-ph"
] | Joshua A. Frieman and Rom\'an Scoccimarro |
astro-ph/9312038 | Theoretical Expectations for Bulk Flows in Large Scale Surveys | We calculate the theoretical expectation for the bulk motion of a large scale
survey of the type recently carried out by Lauer and Postman. Included are the
effects of survey geometry, errors in the distance measurements, clustering
properties of the sample, and different assumed power spectra. We consider the
power sp... | 1993-12-16 | 2009-10-22 | [
"astro-ph"
] | Hume A. Feldman and Richard Watkins |
astro-ph/9312035 | On Identifying the Present-Day Vacuum Energy with the Potential Driving
Inflation | There exists a growing body of observational evidence supporting a
non-vanishing cosmological constant at the present epoch. We examine the
possibility that such a term may arise directly from the potential energy which
drove an inflationary expansion of the very early universe. To avoid arbitrary
alterations in the sh... | 1993-12-16 | 2014-10-13 | [
"astro-ph"
] | Richard A. Frewin and James E. Lidsey |
astro-ph/9312036 | Groups and Clusters in the Near-Infrared | Massive multicolor digital surveys in the near infrared provide new
opportunities for statistical analyses of the properties of groups and
clusters. These galaxy systems provide a natural laboratory for studying
dynamical processes and galaxy evolution, and serve as powerful cosmological
diagnostics. The immediate scie... | 1993-12-16 | 2009-10-22 | [
"astro-ph"
] | Gary A. Mamon (DAEC, Obs. de Meudon & IAP) |
astro-ph/9312037 | Tilting the Primordial Power Spectrum with Bulk Viscosity | Within the context of the cold dark matter model, current observations
suggest that inflationary models which generate a tilted primordial power
spectrum with negligible gravitational waves provide the most promising
mechanism for explaining large scale clustering. The general form of the
inflationary potential which p... | 1993-12-16 | 2015-06-24 | [
"astro-ph"
] | James E. Lidsey |
astro-ph/9312039 | Fluctuations of the Gravitational Constant in the Inflationary
Brans-Dicke Cosmology | According to the Brans--Dicke theory, the value of the gravitational constant
G which we measure at present is determined by the value of the Brans--Dicke
scalar field \phi at the end of inflation. However, due to quantum fluctuations
of the scalar fields produced during inflation, the gravitational constant
G(\phi) ma... | 1993-12-16 | 2009-09-29 | [
"astro-ph",
"gr-qc",
"hep-th"
] | Juan Garcia-Bellido, Andrei Linde and Dmitri Linde |
astro-ph/9312032 | Orbital Variability in the Eclipsing Pulsar Binary PSR B1957+20 | We have conducted timing observations of the eclipsing millisecond binary
pulsar PSR~B1957+20, extending the span of data on this pulsar to more than
five years. During this time the orbital period of the system has varied by
roughly $\Delta P_b/P_b = 1.6 \times 10^{-7}$, changing quadratically with time
and displaying... | 1993-12-15 | 2009-10-22 | [
"astro-ph"
] | Z. Arzoumanian (Princeton), A. S. Fruchter (STScI), J. H. Taylor
(Princeton) |
astro-ph/9312033 | The Three--Point Correlation Function of the Cosmic Microwave Background
in Inflationary Models | We analyze the temperature three--point correlation function and the skewness
of the Cosmic Microwave Background (CMB), providing general relations in terms
of multipole coefficients. We then focus on applications to large angular scale
anisotropies, such as those measured by the {\em COBE} DMR, calculating the
contrib... | 1993-12-15 | 2009-10-22 | [
"astro-ph"
] | A.Gangui, F.Lucchin, S.Matarrese and S.Mollerach |
astro-ph/9312034 | Low Frequency Spectra of Gamma-Ray Bursts | Particles with energies below the mean energy $E_0$ in relativistic shocked
plasmas should assume an equilibrium energy distribution. This leads to a
synchrotron spectrum $F_\nu \propto \nu^{1/3}$ up to approximately the critical
frequency $\nu_0$ of an electron with the energy $E_0$. Application to GRBs
implies that a... | 1993-12-15 | 2011-03-17 | [
"astro-ph"
] | J. I. Katz |
astro-ph/9312030 | Stellar Content and Star Formation Histories | The evolution of irregular galaxies is examined from two points of view: on
the one hand, models of galactic chemical evolution have been computed and
their predictions compared with the corresponding observational data on the
element abundances, and on the other hand, the results of a new method to
derive the star for... | 1993-12-14 | 2007-05-23 | [
"astro-ph"
] | M.Tosi |
astro-ph/9312029 | Preliminary Results from the ESO Slice Project (ESP) | We present the first results of a galaxy redshift survey, ESO Slice Project
(ESP), we are accomplishing as an ESO Key--Project over about 40 square degrees
in a region near the South Galactic Pole. The limiting magnitude is $b_J =
19.4$. Up to now $\sim 85\%$ of the observations has been completed and $\sim
65\%$ of th... | 1993-12-14 | 2007-05-23 | [
"astro-ph"
] | G.Vettolani, E.Zucca, A.Cappi, R.Merighi, M.Mignoli, G.Stirpe,
G.Zamorani, C.Collins, H.MacGillivray, C.Balkowski, J.Alimi, A.Blanchard,
V.Cayatte, P.Felenbok, S.Maurogordato, D.Proust, G.Chincarini, L.Guzzo,
D.Maccagni, R.Scaramella, M.Ramella |
astro-ph/9312031 | Statistics and Topology of the COBE DMR First Year Maps | We use statistical and topological quantities to test the COBE-DMR first year
sky maps against the hypothesis that the observed temperature fluctuations
reflect Gaussian initial density perturbations with random phases. Recent
papers discuss specific quantities as discriminators between Gaussian and
non-Gaussian behavi... | 1993-12-14 | 2011-02-11 | [
"astro-ph"
] | G.F. Smoot, L. Tenorio, A.J. Banday, A. Kogut, E.L. Wright, G.
Hinshaw, and C. Bennett |
astro-ph/9312028 | Robust Morphological Measures for Large-Scale Structure in the Universe | We propose a novel method for the description of spatial patterns formed by a
coverage of point sets representing galaxy samples. This method is based on a
complete family of morphological measures known as Minkowski functionals, which
includes the topological Euler characteristic and geometric descriptors to
specify t... | 1993-12-14 | 2007-05-23 | [
"astro-ph"
] | K.R. Mecke, T. Buchert, H. Wagner |
astro-ph/9312026 | Skewness and Kurtosis in Large-Scale Cosmic Fields | In this paper, I present the calculation of the third and fourth moments of
both the distribution function of the large--scale density and the large--scale
divergence of the velocity field, $\theta$. These calculations are made by the
mean of perturbative calculations assuming Gaussian initial conditions and are
expect... | 1993-12-13 | 2009-10-22 | [
"astro-ph"
] | F. Bernardeau |
astro-ph/9312025 | Shock Excited Maser Emission from the Supernova Remnant W28 | We present VLA observations in the hydroxyl line OH(1720 MHz) towards the
supernova remnant W28. These high resolution images show a more extensive
distribution of 1720 MHz emission than had previously been suspected from
earlier single-dish observations. A total of 26 distinct maser spots were
detected which lie on th... | 1993-12-13 | 2009-10-22 | [
"astro-ph"
] | D. A. Frail, W. M. Goss and V. I. Slysh |
astro-ph/9312027 | The Effect of Repeating Gamma Ray Bursts on V/Vmax | I consider the effect of repeating gamma ray burst sources on the <V/Vmax>
statistic. I find that the treatment of repeating events, if applied
consistently, will not affect the effectiveness of <V/Vmax> as a test of burst
homogeneity. The calculation of <V/Vmax> for apparent repeating and
nonrepeating source populatio... | 1993-12-13 | 2009-10-22 | [
"astro-ph"
] | David Band |
astro-ph/9312024 | On the Nature of Nonthermal Radiation from Cosmological Gamma-Ray
Bursters | Relativistic electron-positron winds with strong magnetic fields are
considered as a source of radiation for cosmological $\gamma$-ray bursters.
Such a wind is generated by a millisecond pulsar with a very strong magnetic
field. An electron-positron plasma near the pulsar is optically thick and in
quasi-thermodynamic e... | 1993-12-13 | 2015-06-24 | [
"astro-ph"
] | Vladimir V. Usov |
astro-ph/9312023 | A Possible Local Counterpart to the Excess Population of Faint Blue
Galaxies | OBSERVATIONS of galaxies to very faint magnitudes have revealed a population
of blue galaxies at intermediate redshift$^{1-5}$. These galaxies represent a
significant excess over the expectation of standard cosmological models for
reasonable amounts of evolution of the locally observed galaxy population.
However, the s... | 1993-12-12 | 2009-10-22 | [
"astro-ph"
] | Stacy McGaugh |
astro-ph/9312022 | Introduction to Cosmology | These notes form an introduction to cosmology with special emphasis on large
scale structure, the cmb anisotropy and inflation. In some places a basic
familiarity with particle physics is assumed, but otherwise no special
knowledge is needed. Most of the material in the first two sections can be
found in several texts,... | 1993-12-12 | 2007-05-23 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | David H Lyth (School of Physics and Materials, Lancaster University,
52 LA1 4YB. U. K.) |
astro-ph/9312021 | Mass and radius of cosmic balloons | This revised version uses Gauss-Codazzi equations to derive the exact mass
and radius relations. The results remain qualitatively the same. | 1993-12-11 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | Yun Wang |
astro-ph/9312018 | Gravothermal Oscillations | Gravothermal oscillations occur in several models for the post-collapse
evolution of rich star clusters. This paper reviews the main literature, and
presents some new N-body results which appear to exhibit this phenomenon. | 1993-12-10 | 2007-05-23 | [
"astro-ph"
] | Douglas C. Heggie (University of Edinburgh, Department of Mathematics
and Statistics,King's Buildings,Edinburgh EH10 5NL,U.K.) |
astro-ph/9312019 | A Self-Consistent Approach to Neutral-Current Processes in Supernova
Cores | The problem of neutral-current processes (neutrino scattering, pair emission,
pair absorption, axion emission, \etc) in a nuclear medium can be separated
into an expression representing the phase space of the weakly interacting
probe, and a set of dynamic structure functions of the medium. For a
non-relativistic medium... | 1993-12-10 | 2011-05-12 | [
"astro-ph",
"hep-ph"
] | Georg Raffelt and David Seckel |
astro-ph/9312020 | Mixed Dark Matter from Neutrino Lasing | We investigate the production of dark matter with non-standard momentum
distributions arising from the decay of a relativistic massive neutrino into a
lighter fermion and boson H$\rightarrow$F$+$B. We develop the Boltzmann
equations for this process, paying particular attention to spin polarisation
effects. Such decays... | 1993-12-10 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | G.D. Starkman, N. Kaiser, R.A. Malaney |
astro-ph/9312016 | The Baryonic Fraction in Groups of Galaxies from X-Ray Measurements | The recent {\sl ROSAT \/} X-ray detections of hot intergalactic gas in three
groups of galaxies are reviewed and the resulting baryonic fraction in these
groups is reevaluated. We show that the baryonic fraction obtained, assuming
hydrostatic equilibrium, should depend, perhaps sensitively, on the radius out
to which t... | 1993-12-08 | 2009-10-22 | [
"astro-ph"
] | Mark J. Henriksen (U. of Alabama) and Gary A. Mamon (DAEC, Obs. de
Meudon) |
astro-ph/9312017 | Large-Angle Cosmic Microwave Background Anisotropies in an Open Universe | If the Universe is open, scales larger than the curvature scale may be probed
by large-angle fluctuations in the cosmic microwave background (CMB). We
consider primordial adiabatic perturbations and discuss power spectra that are
power laws in volume, wavelength, and eigenvalue of the Laplace operator. The
resulting la... | 1993-12-08 | 2008-11-26 | [
"astro-ph",
"hep-ph"
] | Marc Kamionkowski and David N. Spergel |
astro-ph/9312015 | Using FU Orionis Outbursts to Constrain Self-Regulated Protostellar Disk
Models | One dimensional, convective, vertical structure models and one dimensional,
time dependent, radial diffusion models are combined to create a
self-consistent picture in which FU~Orionis outbursts occur in young stellar
objects (YSOs) as the result of a large scale, self-regulated, thermal
ionization instability in the s... | 1993-12-08 | 2009-10-22 | [
"astro-ph"
] | K. R. Bell and D. N. C. Lin |
astro-ph/9312014 | Decaying Neutrinos in Galaxy Clusters | Davidsen et al. (1991) have argued that the failure to detect uv photons from
the dark matter DM) in cluster A665 excludes the decaying neutrino hypothesis.
Sciama et al. (1993) argued that because of high central concentration the DM
in that cluster must be baryonic. We study the DM profile in clusters of
galaxies sim... | 1993-12-07 | 2010-11-30 | [
"astro-ph"
] | Adrian L. Melott, Randall J. Splinter, Massimo Persic and Paolo
Salucci |
astro-ph/9312013 | Position Angles and Alignments of Galaxy Clusters | The position angles of a large number of Abell and Shectman clusters (in
total 637 clusters), identified in the Lick map as surface density
enhancements, are estimated. Using published redshifts for 277 of these I have
detected strong nearest neighbour alignments (2.5 - 3 sigma level), up to about
15 Mpc (Ho = 100). We... | 1993-12-07 | 2007-05-23 | [
"astro-ph"
] | Manolis Plionis (SISSA, via Beirut 2-4, Trieste 34013, Italy) |
astro-ph/9312012 | Quantum Noise in Gravitation and Cosmology | We begin by enumerating the many processes in gravitation and cosmology where
quantum noise and fluctuations play an active role such as particle creation,
galaxy formation and entropy generation. Using the influence functional we
first explain the origin and nature of noise in quantum systems interacting
with an envir... | 1993-12-07 | 2007-05-23 | [
"astro-ph",
"gr-qc"
] | Bei-lok Hu and Andrew Matacz |
astro-ph/9312011 | Dark Matter Annihilations in the Large Magellanic Cloud | The flat rotation curve obtained for the outer star clusters of the Large
Magellanic Cloud is suggestive of an LMC dark matter halo. From the composite
HI and star cluster rotation curve, I estimate the parameters of an isothermal
dark matter halo added to a `maximum disk.' I then examine the possibility of
detecting h... | 1993-12-06 | 2009-10-22 | [
"astro-ph"
] | P Gondolo |
astro-ph/9312010 | The formation of disk galaxies in a cosmological context: Populations,
metallicities and metallicity gradients | We present first results concerning the metallicities and stellar populations
of galaxies formed in a cosmologically motivated simulation. The calculations
include dark matter, gas dynamics, radiation processes, star formation,
supernovae feedback, and metal enrichment. A rotating, overdense sphere with a
mass of $8\,1... | 1993-12-05 | 2007-05-23 | [
"astro-ph"
] | Matthias Steinmetz & Ewald Mueller |
astro-ph/9312009 | Microlensing of Unresolved Stars as a Brown Dwarf Detection Method | We describe a project of brown dwarf detection in the dark halo of a galaxy
using the microlensing effect. We argue that monitoring pixels instead of stars
could provide an enhancement in the number of detectable events. We estimate
the detection efficiency with a Monte-Carlo simulation. We expect a ten-fold
increase w... | 1993-12-05 | 2009-09-25 | [
"astro-ph"
] | Alain Bouquet, Jean Kaplan, Anne-Laure Melchior, Yannick
Giraud-H\'eraud, Paul Baillon |
astro-ph/9312008 | Halo Cold Dark Matter and Microlensing | There is good evidence that most of the baryons in the Universe are dark and
some evidence that most of the matter in the Universe is nonbaryonic with cold
dark matter (cdm) being a promising possibility. We discuss expectations for
the abundance of baryons and cdm in the halo of our galaxy and locally. We show
that in... | 1993-12-04 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | Evalyn Gates and Michael S. Turner |
astro-ph/9312004 | The Angular Bispectrum of The Cosmic Microwave Background | COBE has provided us with a whole-sky map of the CBR anisotropies. However,
even if the noise level is negligible when the four year COBE data are
available, the cosmic variance will prevent us from obtaining information about
the Gaussian nature of the primordial fluctuations. This important issue is
addressed here by... | 1993-12-03 | 2016-08-30 | [
"astro-ph"
] | Xiaochun Luo |
astro-ph/9312005 | Cluster Correlations in the Zel'dovich Approximation | We show how to simulate the clustering of rich clusters of galaxies using a
technique based on the Zel'dovich approximation. This method well reproduces
the spatial distribution of clusters obtainable from full N-body simulations at
a fraction of the computational cost. We use an ensemble of large--scale
simulations to... | 1993-12-03 | 2015-06-24 | [
"astro-ph"
] | S. Borgani, P. Coles, L. Moscardini |
astro-ph/9312007 | Perturbation Theory Confronts Observations~: Implications for the
``Initial'' Conditions and Omega | This paper covers the material of our two talks. We describe a series of
projects based upon perturbative expansions to follow the gravitational
evolution of the one point probability distribution functions (PDFs) for the
density contrast field and for the divergence of the corresponding velocity
field. The Edgeworth e... | 1993-12-03 | 2007-05-23 | [
"astro-ph"
] | F. R. Bouchet and R. Juszkiewicz |
astro-ph/9312006 | The Time Development of a Resonance Line in the Expanding Universe | The time-dependent spectral profile of a resonance line in a homogeneous
expanding medium is studied by numerically solving an improved Fokker-Planck
diffusion equation. The solutions are used to determine the time required to
reach a quasi-static solution near the line center. A simple scaling law for
this relaxation ... | 1993-12-03 | 2009-10-22 | [
"astro-ph"
] | George B. Rybicki, and Ian P. Dell'Antonio |
astro-ph/9312002 | Solar Neutrinos: What We Have Learned | The four operating solar neutrino experiments confirm the hypothesis that the
energy source for solar luminosity is hydrogen fusion. However, the measured
rate for each of the four solar neutrino experiments differs significantly (by
factors of 2.0 to 3.5) from the corresponding theoretical prediction that is
based upo... | 1993-12-02 | 2015-06-24 | [
"astro-ph"
] | John N. Bahcall |
astro-ph/9312003 | Visual Distortions Near a Neutron Star and Black Hole | The visual distortion effects visible to an observer traveling around and
descending to the surface of an extremely compact star are described.
Specifically, trips to a ``normal" neutron star, a black hole, and an
ultracompact neutron star with extremely high surface gravity, are described.
Concepts such as multiple im... | 1993-12-02 | 2008-11-26 | [
"astro-ph",
"gr-qc"
] | Robert J. Nemiroff (NASA/GSFC and George Mason University) |
astro-ph/9312001 | Galaxy Groups in Cold + Hot and CDM Universes: Comparison with CfA | This letter presents results of new high resolution $\Omega=1$ Cold + Hot
Dark Matter (CHDM) and Cold Dark Matter (CDM) simulations. Properties of groups
in these simulations reflect the lower small-scale velocities and the greater
tendency to form distinct filaments on both small and large scales in CHDM as
compared t... | 1993-12-01 | 2009-10-22 | [
"astro-ph"
] | Richard Nolthenius, Anatoly Klypin, and Joel R. Primack |
astro-ph/9311076 | Quantitative Analysis of Voids in Percolating Structures in
Two-Dimensional N-Body Simulations | We present in this paper a quantitative method for defining void size in
large-scale structure based on percolation threshold density. Beginning with
two-dimensional gravitational clustering simulations smoothed to the threshold
of nonlinearity, we perform percolation analysis to determine the large scale
structure. Th... | 1993-11-30 | 2008-02-03 | [
"astro-ph"
] | P.M. Harrington, A.L. Melott, and S.F. Shandarin |
astro-ph/9311074 | Arc Statistics with Realistic Cluster Potentials. I. Method and First
Results | {}From the lensing properties of a numerically simulated cluster, from the
statistical properties of the giant arcs produced by the cluster, and from
comparing the cluster properties derived both from lensing and from the X-ray
properties of the intracluster gas, we conclude (1) that clusters may be
significantly more ... | 1993-11-30 | 2007-05-23 | [
"astro-ph"
] | M. Bartelmann and A.Weiss |
astro-ph/9311077 | The Gravitational Lens System B1422$+$231: Dark Matter, Superluminal
Expansion and the Hubble Constant | A gravitational lens model of the radio quasar B1422+231 is presented which
can account for the image arrangement and approximately for the relative
magnifications. The locations of the principal lensing mass and a more distant
secondary mass concentration were predicted and subsequently luminous galaxies
were found at... | 1993-11-30 | 2015-06-24 | [
"astro-ph"
] | David W. Hogg & R. D. Blandford |
astro-ph/9311075 | A Test of the Adhesion Approximation for Gravitational Clustering | We quantitatively compare a particle implementation of the adhesion
approximation to fully non--linear, numerical nbody simulations. Our primary
tool, cross--correlation of nbody simulations with the adhesion approximation,
indicates good agreement, better than that found by the same test performed
with the Zel'dovich ... | 1993-11-30 | 2009-10-22 | [
"astro-ph"
] | A.L. Melott, S.F. Shandarin, and D.H. Weinberg |
astro-ph/9311073 | Geometrical Evidence for Dark Matter: X-ray Constraints on the Mass of
the Elliptical Galaxy NGC 720 | (shortened for babbage) We describe (1) a new test for dark matter and
alternate theories of gravitation based on the relative geometries of the X-ray
and optical surface brightness distributions and an assumed form for the
potential of the optical light, (2) a technique to measure the shapes of the
total gravitating m... | 1993-11-29 | 2008-11-26 | [
"astro-ph"
] | D. A. Buote & C. R. Canizares |
astro-ph/9311071 | Spectral Properties of Blast Wave Models of Gamma-Ray Burst Sources | We calculate the spectrum of blast wave models of gamma-ray burst sources,
for various assumptions about the magnetic field density and the relativistic
particle acceleration efficiency. For a range of physically plausible models we
find that the radiation efficiency is high, and leads to nonthermal spectra
with breaks... | 1993-11-29 | 2011-09-30 | [
"astro-ph"
] | P. Meszaros, M.J.Rees and H.Papathanassiou |
astro-ph/9311070 | Second Order Power Spectrum and Nonlinear Evolution at High Redshift | The Eulerian cosmological fluid equations are used to study the nonlinear
mode coupling of density fluctuations. We evaluate the second-order power
spectrum including all four-point contributions. In the weakly nonlinear regime
we find that the dominant nonlinear contribution for realistic cosmological
spectra is made ... | 1993-11-29 | 2009-10-22 | [
"astro-ph"
] | Bhuvnesh Jain and Edmund Bertschinger |
astro-ph/9311072 | Amplitude of Primeval Fluctuations from Cosmological Mass Density
Reconstructions | We use the POTENT reconstruction of the mass density field in the nearby
universe to estimate the amplitude of the density fluctuation power spectrum
for various cosmological models. We find sigma_8\Omega_m^{0.6}=
1.3^{+0.4}_{-0.3}, almost independently of the power spectrum. This value
agrees well with the COBE normal... | 1993-11-29 | 2009-10-22 | [
"astro-ph"
] | Uros Seljak and Edmund Bertschinger |
astro-ph/9311069 | Cosmic Structure Formation | This article reviews the prevailing paradigm for how galaxies and larger
structures formed in the universe: gravitational instability. Basic
observational facts are summarized to motivate the standard cosmological
framework underlying most detailed investigations of structure formation. The
observed universe approaches... | 1993-11-29 | 2009-10-22 | [
"astro-ph",
"chao-dyn",
"nlin.CD"
] | Edmund Bertschinger |
astro-ph/9311068 | The power spectrum implied by COBE and the matter correlation function | A phenomenological power spectrum of primordial density perturbations has
been constructed by using both COBE data to probe the large wavelength region,
and a double power law, locally deduced from galaxy catalogs, which describes
the matter correlation function up to tens of Megaparsec. The shape of the
spectrum P(k) ... | 1993-11-28 | 2008-02-03 | [
"astro-ph"
] | S. Torres, R. Fabbri, R. Ruffini |
astro-ph/9311067 | Topological Analysis of COBE-DMR CMB Maps | Geometric characteristics of random fields are exploited to test the
consistency of density perturbation model spectra with COBE data. These CMB
maps are analyzed using the number of anisotropy hot spots and their boundary
curvature. CMB maps which account for instrumental effects and sky coverage are
Monte Carlo gener... | 1993-11-28 | 2008-02-03 | [
"astro-ph"
] | Sergio Torres |
astro-ph/9311063 | An Analysis of IRAS Identified Hii Regions and their Radio Properties | To try and confirm the types of object in the list of 2298 potential HII
regions identified by Hughes \& MacLeod from the IRAS Point Source Catalog, we
selected a sample of 82 for observing at the VLA. We selected half with values
of Y = log(F$_{25}$/F$_{12}$) $\geq$ 0.8, and for control purposes, half with
values of 0... | 1993-11-26 | 2009-10-22 | [
"astro-ph"
] | V.A.Hughes, and G.C.MacLeod |
astro-ph/9311064 | Oxygen Abundances in Low Surface Brightness Disk Galaxies | The oxygen abundances in the \HII regions of a sample of low surface
brightness (LSB) disk galaxies are presented. In general, LSB galaxies are
found to be metal poor ($Z < {1 \over 3} Z\solar$). Indeed, some LSB galaxies
rival the lowest abundance extragalactic objects known. These low metallicities
indicate that LSB ... | 1993-11-25 | 2009-10-22 | [
"astro-ph"
] | Stacy McGaugh |
astro-ph/9311062 | Gravitational Lenses and Unconventional Gravity Theories | We study gravitational lensing by clusters of galaxies in the context of the
generic class of unconventional gravity theories of the scalar--tensor type.
For positive energy scalar fields with any dynamics, the bending of light by a
weakly gravitating system (galaxy or cluster) is always smaller than the
bending predic... | 1993-11-25 | 2010-11-01 | [
"astro-ph",
"gr-qc"
] | Jacob D. Bekenstein and Robert H. Sanders |
astro-ph/9311065 | Lyman Alpha Absorption and Tidal Debris | It is suggested that a significant fraction of the low column-density
absorption features seen in the spectra of quasars are produced in
pressure-confined tidal debris, that was built up in small groups and clusters
of galaxies over a Hubble time. We show that the space-density and
cross-section of tidal tails in group... | 1993-11-25 | 2009-10-22 | [
"astro-ph"
] | Simon L. Morris and Sidney van den Bergh |
astro-ph/9311066 | The Nonlinear Evolution of Rare Events | In this paper I consider the nonlinear evolution of a rare density
fluctuation in a random density field with Gaussian fluctuations, and I
rigorously show that it follows the spherical collapse dynamics applied to its
mean initial profile. This result is valid for any cosmological model and is
independent of the shape ... | 1993-11-25 | 2009-10-22 | [
"astro-ph"
] | F. Bernardeau |
astro-ph/9311061 | Resolving the Beta-Discrepancy for Clusters of Galaxies | Previous comparisons of optical and X-ray observations of clusters of
galaxies have lead to the so-called ``$\beta$ - discrepancy'' that has
persisted for the last decade. The standard hydrostatic-isothermal model for
clusters predicts that the parameter $\beta_{spec} = \sigma_{r}^{2}/(kT/\mu
m_{p})$, which describes t... | 1993-11-24 | 2009-10-22 | [
"astro-ph"
] | Neta A. Bahcall and Lori M. Lubin |
astro-ph/9311056 | Non-Linear Approximations to Gravitational Instability: A Comparison in
Second-Order Perturbation Theory | Nonlinear approximation methods such as the Zeldovich approximation, and more
recently the frozen flow and linear potential approximations, are sometimes
used to simulate nonlinear gravitational instability in the expanding Universe.
We investigate the relative accuracy of these approximations by comparing them
with th... | 1993-11-23 | 2009-10-22 | [
"astro-ph"
] | D. Munshi and A. A. Starobinsky |
astro-ph/9311057 | Reconstructing the linear power spectrum of cosmological mass
fluctuations | We describe an attempt to reconstruct the initial conditions for the
formation of cosmological large-scale structure. The power spectrum of the
primordial fluctuations is affected by bias, nonlinear evolution and
redshift-space distortions, but we show how these effects can be corrected for
analytically. Using eight in... | 1993-11-23 | 2015-06-24 | [
"astro-ph"
] | J.A. Peacock & S.J. Dodds |
astro-ph/9311060 | The Brightest Stars in Galaxies Are Not Good Distance Indicators - | Use of the brightest stars in galaxies as a distance indicator and claims
that the method supports the `short' distance scale are examined. Data from
several different observational programmes are brought together for the first
time with a procedure for the careful accounting of errors. The true
uncertainties of the me... | 1993-11-23 | 2007-05-23 | [
"astro-ph"
] | Richard Rozanski, Michael Rowan-Robinson (Queen Mary and Westfield
College, London, UK) |
astro-ph/9311058 | Neutrino Pair Bremsstrahlung in Neutron Star Crusts: a Reappraisal | We demonstrate that band-structure effects suppress bremsstrahlung of
neutrino pairs by electrons in the crusts of neutron stars at temperatures of
the order of $5\times 10^9 \,{\rm K}$ and below. Taking this into account,
together with the fact that recent work indicates that the masses of neutron
star crusts are cons... | 1993-11-23 | 2009-10-22 | [
"astro-ph"
] | C. J. Pethick and Vesteinn Thorsson |
astro-ph/9311059 | Wiener Reconstruction of Galaxy Surveys in Spherical Harmonics | The analysis of whole-sky galaxy surveys commonly suffers from the problems
of shot-noise and incomplete sky coverage (e.g. at the Zone of Avoidance). The
orthogonal set of spherical harmonics is utilized here to expand the observed
galaxy distribution. We show that in the framework of Bayesian statistics and
Gaussian ... | 1993-11-23 | 2009-10-22 | [
"astro-ph"
] | O. Lahav, K.B. Fisher, Y. Hoffman, C. A. Scharf, and S. Zaroubi |
astro-ph/9311055 | The Quasi-Linear Evolution of the Density Field in Models of
Gravitational Instability | Two quasi-linear approximations, the frozen flow approximation (FFA) and the
frozen potential approximation (FPA), have been proposed recently for studying
the evolution of a collisionless self-gravitating fluid. In the FFA it is
assumed that the velocity field remains unchanged from its value obtained from
the linear ... | 1993-11-22 | 2015-06-24 | [
"astro-ph",
"hep-ph"
] | F. Bernardeau, T. P. Singh, B. Banerjee, S. M. Chitre |
astro-ph/9311052 | Testing the Gravitational Instability Hypothesis? | We challenge a widely accepted assumption of observational cosmology: that
successful reconstruction of observed galaxy density fields from measured
galaxy velocity fields (or vice versa), using the methods of gravitational
instability theory, implies that the observed large-scale structures and
large-scale flows were ... | 1993-11-19 | 2009-10-22 | [
"astro-ph"
] | A. Babul, D. Weinberg, A. Dekel & J. Ostriker |
astro-ph/9311054 | Cosmology/COBE | Abbreviated abstract of an invited talk at the International Cosmic Ray
Conference in Calgary, July 1993: The results from the COBE satellite are in
close agreement with the predictions of the standard hot Big Bang model,
suggesting that the Universe was once hot, dense and isothermal, giving a
background radiation spe... | 1993-11-19 | 2007-05-23 | [
"astro-ph"
] | Edward L. Wright |
astro-ph/9311053 | Power Spectrum Independent Constraints on Cosmological Models | A formalism is presented that allows cosmological experiments to be tested
for consistency, and allows a simple frequentist interpretation of the
resulting significance levels. As an example of an application, this formalism
is used to place constraints on bulk flows of galaxies using the results of the
microwave backg... | 1993-11-19 | 2009-10-07 | [
"astro-ph"
] | Max Tegmark, Emory Bunn and Wayne Hu |
astro-ph/9311046 | Gravitational microlensing: a method for detecting halo dark matter | It has been shown by Paczy\'nski that gravitational microlensing is
potentially a useful method for detecting the dark constituents of the halo of
our galaxy, if their mass lies in the approximate domain $10^{-6} < M/M_{\odot}
< 10^{-1}$. Microlensing observations now under way monito several millions of
stars in the L... | 1993-11-18 | 2008-02-03 | [
"astro-ph"
] | Philippe Jetzer |
astro-ph/9311051 | Microwave backgropund anisotropies, large-scale structure and
cosmological parameters | We review how the various large-scale data constrain cosmological parameters
and, consequently, theories for the origin of large-scale structure in the
Universe. We discuss the form of the power spectrum implied by the correlation
data of galaxies and argue by comparing the velocity field implied by the
distribution of... | 1993-11-18 | 2007-05-23 | [
"astro-ph"
] | A. Kashlinsky |
astro-ph/9311045 | Gravitational microlensing by the dark halo of M31 | It has been shown by Paczy\'nski that gravitational microlensing is
potentially a useful method for detecting the dark constituents of the halo of
our galaxy, if their mass lies in the approximate domain
$10^{-6}<M/M_\odot<10^{-1}$. Microlensing observations now im progress monitor
several millions of stars in the Larg... | 1993-11-18 | 2008-02-03 | [
"astro-ph"
] | Philippe Jetzer |
astro-ph/9311050 | Gamma-Ray Bursts are Time-Asymmetric | A simple test for time-asymmetry is devised and carried out on the brightest
gamma-ray bursts detected by the Burst and Transient Source Experiment (BATSE)
on board the {\it Compton} Gamma Ray Observatory. We show evidence that
individual bursts are time-asymmetric on all time scales tested, from a time
scale shorter t... | 1993-11-18 | 2009-10-22 | [
"astro-ph"
] | R. J. Nemiroff (USRA/GMU/NASA), J. P. Norris (NASA/GSFC), C.
Kouveliotou (USRA/NASA), G. J. Fishman (NASA/MSFC), C. A. Meegan (NASA/MSFC),
and W. S. Paciesas (UAH/NASA) |
astro-ph/9311044 | Is Dark Matter in Spiral Galaxies Cold Gas? II. Fractal Models and Star
Non-Formation | Gas cloud models taking into account the recently disclosed fractal structure
of cold gas are set up, showing that large errors in the classical gas mass
determination based on smooth cloud models can easily follow if the gas is in
reality fractal. Fractal clouds must present both optically thin and optically
thick clu... | 1993-11-18 | 2011-05-23 | [
"astro-ph"
] | D. Pfenniger & F. Combes |
astro-ph/9311047 | Gravitational microlensing by the halo of the Andromeda galaxy | It has been shown by Paczy\'nski that gravitational microlensing is a useful
method to detect brown dwarfs in the dark halo of our galaxy. At present
several experiments are carried out to monitor several million stars in the
Large Magellanic Cloud with the aim to find such microlensing events. Here I
discuss the possi... | 1993-11-18 | 2008-02-03 | [
"astro-ph"
] | Philippe Jetzer |
astro-ph/9311043 | Is Dark Matter in Spiral Galaxies Cold Gas? I. Observational Constraints
and Dynamical Clues About Galaxy Evolution | Based on dynamical constraints about the Hubble sequence evolution,
observational data and a number of "conspiracies", we propose that the dark
matter around spiral galaxies is in the form of cold gas, essentially in
molecular form and rotationally supported. (full A&A paper (in press) available
by anonymous ftp at obs... | 1993-11-18 | 2011-05-23 | [
"astro-ph"
] | D. Pfenniger, F. Combes & L. Martinet |
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