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/9412016 | A Supergiant Supernova-Blown Bubble in the Spiral Galaxy NGC 1620 | We present UBR and H$\alpha$ imaging of NGC 1620, a highly inclined spiral
galaxy that contains a large scale, arc-like feature of radius 3 kpc in its
outer disk at a distance of $\sim$ 11 kpc from the center. What is unusual
about this arc-like feature is its stellar nature and the presence of a
luminous star cluster ... | 1994-12-06 | 2009-10-22 | [
"astro-ph"
] | J. Patricia Vader and Brian Chaboyer |
astro-ph/9412014 | Cluster Alignments in the Edinburgh/Milano Cluster Redshift Survey | We present here the results of a statistical search for cluster alignments
using the Edinburgh/Milano cluster redshift survey. This survey is a unique
cluster database which has been objectively constructed to help minimise the
systematic biases associated with previous optical cluster catalogues. We find
some evidence... | 1994-12-05 | 2015-06-24 | [
"astro-ph"
] | D.R.Martin, R.C.Nichol, C.A.Collins, S.A.Lumsden and L.Guzzo |
astro-ph/9412012 | Cosmological Inflation, Microwave Background Anisotropies and Large
Scale Structure of the Universe | Cosmological inflation provides the simplest and most promising mechanism for
generating fluctuations for structure formation. Using powerful Hamilton-Jacobi
methods, I will describe (1) how to compute density fluctuations and cosmic
microwave anisotropies arising from inflation, and (2) improvements of the
Zel'dovich ... | 1994-12-05 | 2009-09-25 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | D. S. Salopek |
astro-ph/9412011 | Another Flattened Dark Halo: Plar Ring Galaxy A0136-0801 | Knowledge of the shape of dark matter halos is critical to our understanding
of galaxy formation, dynamics, and of the nature of dark matter itself. Polar
ring galaxies (PRGs) --- early-type galaxies defined by their outer rings of
gas, dust and stars on orbits nearly perpendicular to those of the central host
--- prov... | 1994-12-05 | 2009-10-22 | [
"astro-ph"
] | Penny D. Sackett and Richard W. Pogge |
astro-ph/9412013 | Is Compton scattering in strong magnetic fields really infrared
divergent? | The infrared behavior of QED changes drastically in the presence of a strong
magnetic field: the electron self-energy and the vertex function are infrared
{\em finite}, in contrast with field-free QED, while new infrared divergences
appear that are absent in free space. One famous example of the latter is the
infrared ... | 1994-12-05 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | M. Kachelriess, D. Berg, and G. Wunner |
astro-ph/9412010 | Intergalactic Matter and Cocoons of Radio Galaxies | The cocoons surrounding powerful radio sources can be extensive if the jet
that feeds the cocoon is light and supersonic. They have been shown to remain
overpressured with respect to the ambient medium for most of the life time of
the sources. The observed lobes of the radio sources form parts of these
extensive cocoon... | 1994-12-03 | 2015-06-24 | [
"astro-ph"
] | Biman B. Nath |
astro-ph/9412009 | Probing the Galactic Dark Matter Mass Funtion Using Microlensing and
Direct Searches | If compact baryonic objects contribute significantly to the dark matter in
our Galaxy, their mass function will present vital clues for galaxy formation
theories and star formation processes in the early Universe. Here we discuss
what one might expect to learn about the mass function of Galactic dark matter
from microl... | 1994-12-02 | 2008-11-26 | [
"astro-ph"
] | E. J. Kerins and B. J. Carr |
astro-ph/9412006 | Optical and Infrared Observations of SGR 1806-20 | The soft gamma-ray repeater (SGR) 1806$-$20 is associated with the
center-brightened non-thermal nebula G~10.0$-$0.3, thought to be a plerion. As
in other plerions, a steady \Xray\ source, AX~1805.7$-$2025, has been detected
coincident with the peak of the nebular radio emission. Vasisht et al.\ have
shown that the rad... | 1994-12-02 | 2009-10-22 | [
"astro-ph"
] | S. R. Kulkarni, K. Matthews, G. Neugebauer, I. N. Reid, M. H. van
Kerkwijk, G. Vasisht (Palomar Observatory, Caltech) |
astro-ph/9412008 | Maps of the Molecular Emission Around 18 Evolved Stars | We present maps at $20''$ resolution of the molecular emission around 18
evolved stars (14~asymptotic giant branch stars, one supergiant, two
proto-planetary nebulae and one planetary nebula), mostly in the $^{12}$CO(3-2)
line. Almost all molecular envelopes appear to be at least marginally resolved
at this resolution.... | 1994-12-02 | 2009-10-22 | [
"astro-ph"
] | K.Z. Stanek, G.R. Knapp, K. Young & T.G. Phillips |
astro-ph/9412007 | Microlensing, Newton-Einstein Gravity and Conformal Gravity | We discuss some implications of the current round of galactic dark matter
searches for galactic rotation curve systematics and dynamics, and show that
these new data do not invalidate the conformal gravity program of Mannheim and
Kazanas which has been advanced as a candidate alternative to both the standard
second ord... | 1994-12-02 | 2009-10-22 | [
"astro-ph"
] | Philip D. Mannheim (University of Connecticut) |
astro-ph/9411117 | Radio Monitoring and High Resolution Observations of the Soft Gamma Ray
Repeater 1806-20. by Vasisht et al. Postscript file, 13 pages | We report the results of radio flux-monitoring and high resolution
observations at 3.6 cm with the VLA, of the central condensation in G10.0-0.3,
the radio nebula surrounding the soft gamma ray repeater (SGR) 1806-20. The
quiescent X-ray source AX1805.7-2025 is coincident with the radio core
suggesting that G10.0-0.3 i... | 1994-12-01 | 2015-06-24 | [
"astro-ph"
] | G. Vasisht, D. A. Frail, and S. R. Kulkarni |
astro-ph/9412001 | Nearby Galaxies and the Ginga X-ray Background | We present here the results of cross-correlating the X-ray background
measured by Ginga in the 2-10 keV band with several catalogues of extragalactic
objects. Positive signals with an amplitude of a few per cent have been found
for some catalogues implying that some fraction of the X-ray background is
produced either b... | 1994-12-01 | 2015-06-24 | [
"astro-ph"
] | F.J. Carrera, X. Barcons, J.A. Butcher, A.C. Fabian, O. Lahav, G.C.
Stewart & R.S. Warwick |
astro-ph/9412002 | ROSAT Observations of Blazars from a Polarized Radio Selected Sample | We have observed with ROSAT six blazars from the sample of 31 polarized
objects constructed by Impey and Tapia (1988). Results of the spectral analysis
in the ROSAT band of three objects, PKS 0301-243, PKS 1055+018 and PG 1424+240
are presented here and compared with the three previously published objects.
Using a simp... | 1994-12-01 | 2009-10-22 | [
"astro-ph"
] | L. Maraschi, G. Fossati, G. Tagliaferri and A. Treves |
astro-ph/9412004 | Subcluster Merger and Galaxy Infall in A2151 | We have obtained a 12.5 ksec image of the Hercules Cluster, A2151, with the
{\it ROSAT} PSPC. Comparison of the optical and X-ray data suggest the presence
of at least three distinct subclusters in A2151. The brightest X-ray emission
coincides with the highest-density peak in the galaxy distribution, and is
bimodal. Th... | 1994-12-01 | 2009-10-22 | [
"astro-ph"
] | C.M. Bird (U. Kansas), D.S. Davis (GSFC/U. Maryland), T.C. Beers
(Michigan State) |
astro-ph/9411116 | A Determination of the Thick Disk Chemical Abundance Distribution:
Implications for Galaxy Evolution | We present a determination of the thick disk iron abundance distribution
obtained from an in situ sample of F/G stars. These stars are faint, $15 \simlt
V \simlt 18$, selected on the basis of color, being a subset of the larger
survey of Gilmore and Wyse designed to determine the properties of the stellar
populations s... | 1994-12-01 | 2009-10-22 | [
"astro-ph"
] | Gerard Gilmore (Institute of Astronomy, Cambridge), Rosemary F.G. Wyse
(Center for Particle Astrophysics, University of California, Berkeley) and J.
Bryn Jones (University of Wales, College of Cardiff) |
astro-ph/9412003 | Constraints on the topology of the universe from the 2-yr COBE data | The cosmic microwave background (CMB) is a unique probe of cosmological
parameters and conditions. There is a connection between anisotropy in the CMB
and the topology of the Universe. Adopting a universe with the topology of a
3-Torus, or a universe where only harmonics of the fundamental mode are
allowed, and using 2... | 1994-12-01 | 2009-10-22 | [
"astro-ph"
] | Angelica de Oliveira-Costa, George F. Smoot |
astro-ph/9412005 | A brute force analysis of the COBE DMR data | More than a dozen papers analyzing the COBE data have now appeared. We review
the different techniques and compare them to a ``brute force" likelihood
analysis where we invert the full 4038 x 4038 Galaxy-cut pixel covariance
matrix. This method is optimal in the sense of producing minimal error bars,
and is a useful re... | 1994-12-01 | 2008-11-26 | [
"astro-ph"
] | Max Tegmark, Emory Bunn |
astro-ph/9411115 | Faint Field Galaxies: A Population of Intrinsically Faint Objects at Low
Redshift? | To distinguish between the different models proposed to understand the excess
of faint field counts over the predictions from non-evolving models, a number
of redshift surveys have been undertaken. The answer has not arrived yet due to
the high rate of incompleteness achieved. Un-identified galaxies have been
shown to ... | 1994-11-30 | 2007-05-23 | [
"astro-ph"
] | Ana Campos (Instituto Astrofisica Andalucia Csic) |
astro-ph/9411114 | Recent Developments in Gravitational Microlensing and the Latest MACHO
Results: Microlensing Towards the Galactic Bulge | We review recent gravitational microlensing results from the EROS, MACHO, and
OGLE collaborations, and present some details of the very latest MACHO results
toward the Galactic Bulge. The MACHO collaboration has now discovered in excess
of 40 microlensing events toward the Galactic Bulge during the 1993 observing
seaso... | 1994-11-30 | 2009-10-22 | [
"astro-ph"
] | D.P. Bennett, C. Alcock, R.A. Allsman, T.S. Axelrod, K.H. Cook, K.C.
Freeman, K. Griest, S.L. Marshall, S. Perlmutter, B.A. Peterson, M.R. Pratt,
P.J. Quinn, A.W. Rodgers, C.W. Stubbs, and W. Sutherland (The MACHO
Collaboration) |
astro-ph/9411113 | Optical variability of the supersoft source RX~J0019.8+2156 | We present a 100 yr optical lightcurve of the recently discovered supersoft
X-ray source RX~J0019.8+2156 as deduced from photographic plates of Harvard and
Sonneberg Observatory. Apart from the periodic orbital variations two different
timescales of optical variability are discovered. The timescales and amplitudes
of t... | 1994-11-29 | 2007-05-23 | [
"astro-ph"
] | J. Greiner, W. Wenzel |
astro-ph/9411112 | Spatiotemporal complexity of the universe at subhorizon scales | This is a short note on the spatiotemporal complexity of the dynamical
state(s) of the universe at subhorizon scales (up to 300 Mpc). There are
reasons, based mainly on infrared radiative divergences, to believe that one
can encounter a flicker noise in the time domain, while in the space domain,
the scaling laws are r... | 1994-11-29 | 2009-10-22 | [
"astro-ph",
"gr-qc"
] | H.C. Rosu |
astro-ph/9411111 | The Cosmic Microwave Background Dipole as a Cosmological Effect | A conventional explanation of the dipole anisotropy of the cosmic microwave
background (CMB) radiation is in terms of the Doppler effect: our galaxy is
moving with respect to CMB frame with $ \sim 600 ~ km ~ s^{-1} $. However, as
the deep redshift surveys fail to reveal a convergence of the large scale flow
to zero at ... | 1994-11-29 | 2007-05-23 | [
"astro-ph"
] | M. Jaroszynski (Warsaw University Observatory, Princeton University
Observatory) and B. Paczynski(Princeton University Observatory) |
astro-ph/9411110 | Millimeter Observations of a Complete Sample of IRAS Galaxies: Dust
Emission and Absorption in Spirals | We report on observations performed at 1.25 $mm$ of a southern galaxy sample,
selected from the IRAS PSC and complete to $S_{60}=2 Jy$. We detected 18
sources and set significant limits on 10 further objects. We use these data to
discuss the spatial distribution of cold dust, the broad-band far-IR/mm
spectra, the overa... | 1994-11-29 | 2009-10-22 | [
"astro-ph"
] | A. Franceschini and P. Andreani (Osservatorio Astronomico - Padova) |
astro-ph/9411109 | RORF - a Radio Optical Reference Frame | The radio observations are based on dual frequency Mark--III VLBI data from
1979 until the end of 1993. Currently 436 sources define the celestial inertial
frame. A comparison to the JPL94R01 catalog is made. Position vs. time plots of
selected sources show significant apparent non linear proper motions. The
status of ... | 1994-11-29 | 2007-05-23 | [
"astro-ph"
] | N.Zacharias, A.L.Fey, J.L.Russell and K.J.Johnston |
astro-ph/9411106 | Unified schemes for active galaxies: a clue from the missing
Fanaroff-Riley type I quasar population | We link the lack of FR I type structure among quasars to the void of radio
loud quasars below a critical disk luminosity of ~10^46 erg/sec in the PG
sample. We argue that the opening angle of the obscuring torus in radio loud
quasars depends on the power of the central engine, approaching the jet's
beaming angle near t... | 1994-11-28 | 2007-05-23 | [
"astro-ph"
] | Heino Falcke, Gopal-Krishna, Peter L. Biermann |
astro-ph/9411108 | Chemical Evolution of Irregular and Blue Compact Galaxies | We discuss the chemical evolution of metal poor galaxies and conclude that
their oxygen deficiency is not due to: the production of black holes by massive
stars or a varying slope of the Initial Mass Function, IMF, at the high-mass
end. A varying IMF at the low-mass end alone or in combination with: (a) an
outflow of o... | 1994-11-28 | 2009-10-22 | [
"astro-ph"
] | L. Carigi (CIDA, Venezuela), P. Colin, M. Peimbert, and A. Sarmiento
(IAUNAM, Mexico) |
astro-ph/9411107 | Temperature-Polarization Correlations from Tensor Fluctuations | We study the polarization-temperature correlations on the cosmic microwave
sky resulting from an initial scale invariant spectrum of tensor (gravity wave)
fluctuations, such as those which might arise during inflation. The correlation
function has the opposite sign to that for scalar fluctuations on large scales,
raisi... | 1994-11-28 | 2010-12-13 | [
"astro-ph",
"hep-ph"
] | R.G. Crittenden, D. Coulson and N.G. Turok |
astro-ph/9411105 | Halo/Thick Disk CVs and the Cosmic X-Ray Background | In a recent study (Maoz and Grindlay 1995) we have found that a number of
previously recognized anomalies in the diffuse x-ray background at soft
energies (\sim 0.5-2 keV) can be understood if about 20-30% of the diffuse flux
arises from a population of low luminosity sources in a thick disk or flattened
halo distribut... | 1994-11-27 | 2007-05-23 | [
"astro-ph"
] | Jonathan E. Grindlay and Eyal Maoz |
astro-ph/9411104 | False Vacuum Inflation with a Quartic Potential | We consider a variant of Hybrid Inflation, where inflation is driven by two
interacting scalar fields, one of which has a `Mexican hat' potential and the
other a quartic potential. Given the appropriate initial conditions one of the
fields can be trapped in a false vacuum state, supported by couplings to the
other fiel... | 1994-11-25 | 2016-08-24 | [
"astro-ph"
] | David Roberts, Andrew R Liddle and David H Lyth |
astro-ph/9411102 | Gamma Ray Bursts, Neutron Star Quakes, and the Casimir Effect | We propose that the dynamic Casimir effect is a mechanism that converts the
energy of neutron starquakes into $\gamma$--rays. This mechanism efficiently
produces photons from electromagnetic Casimir energy released by the rapid
motion of a dielectric medium into a vacuum. Estimates based on the cutoff
energy of the gam... | 1994-11-25 | 2007-05-23 | [
"astro-ph",
"hep-ph",
"hep-th"
] | C. Carlson, T. Goldman and J. Perez-Mercader |
astro-ph/9411103 | The Morphological Evolution of Field Galaxies | I review two observational programs which, together, promise to unravel the
detailed astrophysical evolution of normal field galaxies over the last 5-7
Gyr. Systematic ground-based spectroscopy of faint galaxies have revealed an
increasing faint end slope for the luminosity function with redshift. The trend
is stronges... | 1994-11-25 | 2007-05-23 | [
"astro-ph"
] | Richard S Ellis (Institute of Astronomy, Cambridge, UK) |
astro-ph/9411101 | Are Spiral Disks Really Opaque ? | We compare the ultra-violet, optical, and far-infrared emission for a sample
of 135 spiral galaxies in order to address the widely debated problem
concerning the opacity of spiral disks. We find that the re-radiation of the
dust, estimated from the far-infrared emission, is on average only 31$\pm 1$
percent of the bolo... | 1994-11-24 | 2007-05-23 | [
"astro-ph"
] | C. Xu and V. Buat |
astro-ph/9411099 | Screening of Nuclear Reactions in the Sun and Solar Neutrinos | We quantitatively determine the effect and the uncertainty on solar neutrino
production arising from the screening process. We present predictions for the
solar neutrino fluxes and signals obtained with different screening models
available in the literature and by using our stellar evolution code. We explain
these nume... | 1994-11-24 | 2009-09-25 | [
"astro-ph"
] | B.Ricci, S. Degl'Innocenti and G. Fiorentini |
astro-ph/9411100 | The jet-disk symbiosis. II. Interpreting the Radio/UV correlations in
quasars | We investigate the correlation between the accretion disk (UV) luminosity and
the radio core emission of a quasar sample. In a radio/$L_{\rm disk}$ plot we
find the quasars to be separated into four classes: core dominated quasars
(CDQ), lobe dominated quasars (LDQ), radio-intermediate quasars (RIQ) and radio
weak quas... | 1994-11-24 | 2011-05-23 | [
"astro-ph"
] | Heino Falcke, Matthew A. Malkan and Peter L. Biermann |
astro-ph/9411097 | Comparison of the COBE DMR and Tenerife Data | We have compared the Tenerife data with the {\it COBE} DMR two-year data in
the declination +40\deg region of the sky observed by the Tenerife experiment.
Using the Galactic plane signal at $\sim 30$ GHz, we show that the two data
sets are cross-calibrated to within 5%. The high Galactic latitude data were
investigated... | 1994-11-23 | 2009-10-22 | [
"astro-ph"
] | C. H. Lineweaver, S. Hancock, G. F. Smoot, A. N. Lasenby, R. D.
Davies, A. J. Banday, C. M. Gutierrez de la Cruz, R. A. Watson, R. Rebolo |
astro-ph/9411096 | The jet-disk symbiosis. I. Radio to X-ray emission models for quasars | Starting from the assumption that radio jets and accretion disks are
symbiotic features present in radio loud and radio quiet quasars we scale the
bulk power of radio jets with the accretion power by adding mass- and energy
conservation of the whole jet-disk system to the standard Blandford \& K\"onigl
theory for compa... | 1994-11-23 | 2011-05-23 | [
"astro-ph"
] | Heino Falcke and Peter L. Biermann |
astro-ph/9411098 | Structure Formation with Decaying Neutrinos | We consider the effects of a massive, unstable neutrino on the evolution of
large--scale structure and anisotropies in the cosmic microwave background.
Comparison with large--scale structure data allows us to rule out a wide range
of masses and lifetimes for such neutrinos. We also define a range of masses
and lifetime... | 1994-11-23 | 2008-11-26 | [
"astro-ph"
] | M.White, G.Gelmini & J.Silk |
astro-ph/9411089 | Extragalactic Large-Scale Structures behind the Southern Milky Way. - I.
Redshifts Obtained at the SAAO in the Hydra/Antlia Extension | Spectroscopic observations have been carried out for galaxies in the Milky
Way with the 1.9 m telescope of the South African Astronomical Observatory
(SAAO). The galaxies were selected from a deep optical galaxy search covering
266<l<296 |b|<10deg. This is in the extension of the Hydra and Antlia clusters
and in the ap... | 1994-11-22 | 2007-05-23 | [
"astro-ph"
] | Renee C. Kraan-Korteweg (Kapteyn Institute, Groningen), Tony P.
Fairall (UCT, Cape Town), Chantal Balkowksi (Observatoire de Meudon) |
astro-ph/9411092 | The Optical Gravitational Lensing Experiment. Follow-Up Observations of
the Macho Microlensing Event in the Galactic Bulge | We present follow-up observations of a gravitational microlensing candidate
found by the MACHO collaboration in the Galactic bulge. The photometric data
cover a period near the maximum of the event and may be used to construct
complete light curve. The position of the lensed star in the color magnitude
diagram suggests... | 1994-11-22 | 2009-09-25 | [
"astro-ph"
] | M. Szymanski, A. Udalski, J. Kaluzny, M. Kubiak, W. Krzeminski and M.
Mateo |
astro-ph/9411095 | How Do the Stellar Disc and Thick Disc Stop ? | As part of a stellar population sampling program, a series of photometric
probes at various field sizes and depths have been obtained in a low extinction
window in the galactic anticentre direction. Very deep CCD frames probe the
most external parts of the disc, providing strong evidence that the galactic
density scale... | 1994-11-22 | 2007-05-23 | [
"astro-ph"
] | Annie C. Robin, Michel Creze, Vijay Mohan |
astro-ph/9411091 | Hydrodynamics of the Cosmological Quark-Hadron Transition in the
Presence of Long-Range Energy and Momentum Transfer | Two previous papers in this series have presented a study of the growth of
hadronic bubbles during the cosmological Quark--Hadron transition, treating the
material within each phase as a single perfect fluid. Here, we extend the
analysis to include the effects of long-range energy and momentum transfer by
weakly and el... | 1994-11-22 | 2009-10-22 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | J.C. Miller and L. Rezzolla |
astro-ph/9411094 | Molecular Photodissociation in the Neutral Envelopesof Planetary Nebulae | The dissociation and subsequent ionisation of molecular material in a
detached, spherically symmetric stellar wind is modelled as a star evolves from
the post-asymptotic giant branch phase to a planetary nebula (i.e. from a
stellar effective temperature of Teff=6000K to Teff=33000K). The model is
compared to the observ... | 1994-11-22 | 2015-06-24 | [
"astro-ph"
] | G.T.Gussie, A.R.Taylor, P.E.Dewdney, and R.S.Roger |
astro-ph/9411093 | HI and CO Observations of Circumnebular Envelopes of Planetary Nebulae | 21cm spectral-line and continuum observations of ten compact planetary
nebulae have been made with the Very Large Array. Circumnebular atomic hydrogen
is identified in the planetary nebulae SwSt1, M3-35, and possibly in Hu2-1. The
possibility of an inverse correlation between the optical depth of
circumnebular atomic h... | 1994-11-22 | 2015-06-24 | [
"astro-ph"
] | G. T. Gussie and A. R. Taylor |
astro-ph/9411090 | A $BVI$ Photometric Study of the Near-Galactic Center Globular Cluster
NGC 6517 (C1759-089) | We present the results of a $BVI$ photometric study of the globular cluster
NGC 6517 using CCD images obtained at the prime focus of the CFHT. From the
resultant color-magnitude diagram, we infer that the cluster is differentially
reddened and develop a method for determining the amplitude of this effect,
which amounts... | 1994-11-22 | 2009-10-22 | [
"astro-ph"
] | JJ Kavelaars, David A. Hanes, Terry J. Bridges and William E. Harris |
astro-ph/9411084 | Radio Supernovae as Tev Gamma-Ray Sources | When applied to the blast wave formed by the explosion of a massive star as a
supernova (SN), the theory of diffusive particle acceleration at shock fronts
predicts a very high energy density in cosmic rays. Almost immediately after
particles begin to be injected into the process, the cosmic ray pressure rises
until co... | 1994-11-21 | 2011-05-23 | [
"astro-ph"
] | J.G. Kirk, P. Duffy and Lewis Ball |
astro-ph/9411083 | Multicolor surface photometry of brightest cluster galaxies: II.
Enlarging the sample and improving the analysis | Intrinsic color profiles of a sample of nine Brightest Cluster Galaxies
(BCGs) are recovered from the observed color profiles by evaluating spurious
gradients introduced by errors in the determination of the sky levels and by
different seeing conditions between the observations. Isophote shapes and
surface brightness p... | 1994-11-21 | 2008-02-03 | [
"astro-ph"
] | S. Andreon, B.Garilli and D. Maccagni |
astro-ph/9411088 | The Vertical Distribution and Kinematics of HI and Mass Models of the
Galactic Disk | We present full modeling of tangent point emission of HI as seen in the 21 cm
transition in the inner Galaxy ($R \simeq 3-8 \kpc$). The model used takes into
account emission from a large path length along the line of sight,
corresponding to an interval ($\Delta R$) of typically $\le 1 \kpc$ in galactic
radius; and is ... | 1994-11-21 | 2011-03-28 | [
"astro-ph"
] | Sangeeta Malhotra |
astro-ph/9411087 | Complete Model of a Self-gravitating Cosmic String I. A New Class of
Exact Solutions and Gravitational Lensing | We find solutions of Einstein's field equation for topologically stable
strings associated with the breaking of a U(1) symmetry. Strings form in many
GUTs and are expected whenever the homotopy group $\Pi_1(M_0)$ is non-trivial.
The behavior of the fields making up the string is described by the
Euler-Lagrange equation... | 1994-11-21 | 2009-10-22 | [
"astro-ph"
] | Charles C. Dyer and Francine R. Marleau (Department of Astronomy,
University of Toronto, Canada) |
astro-ph/9411085 | Quasar Populations in a Cosmological Constant Dominated Flat Universe | Most physical properties derived for quasars, as single entities or as a
population, depend upon the cosmology assumed. In this paper, we calculate the
quasar luminosity function and some related quantities for a flat universe
dominated by a cosmological constant $\Lambda$ ($\Lambda=0.9, \Omega=0.1$) and
compare them w... | 1994-11-21 | 2009-10-22 | [
"astro-ph"
] | Sangeeta Malhotra and Edwin L Turner |
astro-ph/9411086 | The UV-Drag on Hadronic Hot Jets as the Origin of X-Ray Irradiation in
AGN | Consequences of anisotropic cascade radiation in AGN are investigated. The
anisotropic cascades are produced by protons accelerated in a nuclear jet. The
protons are assumed to cool in the UV photon field of an accretion disk by
photo-production of secondary particles. Most cascade photons are produced in
the direction... | 1994-11-21 | 2007-05-23 | [
"astro-ph"
] | Karl Mannheim (Goettingen University Observatory) |
astro-ph/9411082 | Gravitational Lensing Limits on Cold Dark Matter and Its Variants | Standard $\Omega_0=1$ cold dark matter (CDM) needs $0.27 < \sigma_8 < 0.63$
($2\sigma$) to fit the observed number of large separation lenses, and the
constraint is nearly independent of $H_0=100h^{-1}\kms$ Mpc$^{-1}$. This range
is strongly inconsistent with the COBE estimate of $\sigma_8=(2.8\pm0.2)h$.
Tilting the pr... | 1994-11-19 | 2009-10-22 | [
"astro-ph"
] | Christopher S. Kochanek |
astro-ph/9411076 | ROSAT observations of the B2 radio galaxies 1615+35 and 1621+38:
implications on the radio source confinement | We report X-ray observations of the radio galaxies B2 1615+35 (NGC 6109) and
B2 1621+38 (NGC 6137), which belong to poor groups of galaxies and are
characterized by a "head-tail" structure. We also analyze the X-ray behaviour
of the radio galaxy NGC 6107, present within the field of view and showing a
symmetric extende... | 1994-11-18 | 2007-05-23 | [
"astro-ph"
] | L.Feretti, R. Fanti, P. Parma, S. Massaglia, E. Trussoni, W. Brinkmann
(IRA, Bologna - OA, Torino - MPE, Garching) |
astro-ph/9411080 | Spectral Classification of Galaxies | We investigate the integrated spectra of a sample of 24 normal galaxies. A
principal component analysis suggests that most of the variance present in the
spectra is due to the differences in morphology of the galaxies in the sample.
We show that spectroscopic parameters extracted from the spectra, like the
amplitude of... | 1994-11-18 | 2009-10-22 | [
"astro-ph"
] | Laerte Sodre Jr. and Hector Cuevas |
astro-ph/9411077 | Open clusters as tracers of the evolution of the Galaxy | Deep color-magnitude diagrams are presented for poorly known open clusters Cr
261, Be 18, Be 54, Tr 5 and BH176. All clusters are old objects with age\geq 4
Gyr. BH176 is either old open cluster or young globular cluster. Extremely red
giants with V-I>3 were identified in the central parts of Cr 261, Be 54 and
BH176. T... | 1994-11-18 | 2007-05-23 | [
"astro-ph"
] | Janusz Kaluzny, Wojtek Krzeminski & Beata Mazur |
astro-ph/9411075 | The Space Distribution of the Lyman Alpha Clouds in the Line of Sight to
the Z=3.66 QSO 0055-269 | The spectrum of the quasar Q0055-269 ($z=3.66$) has been observed at the
resolution of 14 km s$^{-1}$ in the wavelength interval 4750--6300 \AA. We give
a list of Lyman$-\alpha$ lines and metal-line systems for which column
densities and Doppler widths have been derived by a fitting procedure. The
statistical distribut... | 1994-11-18 | 2015-06-24 | [
"astro-ph"
] | S. Cristiani, S. D'Odorico, A. Fontana, E. Giallongo, S. Savaglio |
astro-ph/9411074 | A non-LTE study of Li I lines in AGB stars | We study the formation of Li lines in a case study of an S-type AGB star in
the SMC. AGB stars may be important providers of $^7$Li to the interstellar
medium. Abundance analysis of these stars is difficult due to the heavy
molecular blanketing, uncertainties in the model atmospheres and possible
departures from LTE in... | 1994-11-18 | 2007-05-23 | [
"astro-ph"
] | Dan Kiselman (NORDITA, Copenhagen) and Bertrand Plez (Niels Bohr
Institute, Copenhagen) |
astro-ph/9411081 | The formation of close binary systems | A viable solution to the origin of close binary systems, unaccounted for in
recent theories, is presented. Fragmentation, occurring at the end of the
secondary collapse phase (during which molecular hydrogen is dissociating), can
form binary systems with separations less than 1 au. Two fragmentation modes
are found to ... | 1994-11-18 | 2015-06-24 | [
"astro-ph"
] | Ian A. Bonnell and Matthew R. Bate |
astro-ph/9411079 | The Cluster Distribution as a Test for Dark Matter Models. I: Clustering
Properties | We present extended simulations of the distribution of galaxy clusters in
different dark matter models, using an optimized version of the Zel'dovich
approximation. Six different dark matter models are studied: Standard CDM, Open
CDM, Tilted CDM, Cold + Hot DM, low-density CDM with cosmological constant, and
low Hubble ... | 1994-11-18 | 2009-10-22 | [
"astro-ph"
] | S. Borgani, M. Plionis, P. Coles, L. Moscardini |
astro-ph/9411078 | The Optical Gravitational Lensing Experiment. Variable stars in the
Sculptor dwarf speroidal galaxy | The central area of the Sculptor dwarf galaxy was surveyed for variable stars
as a side-program of the OGLE project. Light curves in the V band were obtained
for 226 RR Lyr stars and for 3 anomalous cepheids. One previously unknown
anomalous cepheid was identified. We discovered also two variables located at
the tip of... | 1994-11-18 | 2007-05-23 | [
"astro-ph"
] | J. Kaluzny, M. Kubiak, M. Szymanski, A. Udalski, W. Krzeminski & M.
Mateo |
astro-ph/9411070 | Approaches to Automated Morphological Classification of Galaxies | There is an obvious need for automated classification of galaxies, as the
number of observed galaxies increases very fast. We examine several approaches
to this problem, utilising {\em Artificial Neural Networks} (ANNs). We quote
results from a recent study which show that ANNs can classsify galaxies
morphologically as... | 1994-11-17 | 2009-10-22 | [
"astro-ph"
] | Avi Naim |
astro-ph/9411071 | Artificial Neural Networks as Non-Linear Extensions of Statistical
Methods in Astronomy | We attempt to de-mistify Artificial Neural Networks (ANNs) by considering
special cases which are related to other statistical methods common in
Astronomy and other fields. In particular we show how ANNs generalise Bayesian
methods, multi-parameter fitting, Principal Component Analysis (PCA), Wiener
filtering and regul... | 1994-11-17 | 2009-10-22 | [
"astro-ph"
] | Ofer Lahav |
astro-ph/9411068 | Astrometric Tests of Galactic Evolution | There are many fundamental aspects of Galactic structure and evolution which
can be studied best or exclusively with high quality three dimensional
kinematics. Amongst these we note as examples determination of the orientation
of the stellar velocity ellipsoid, and the detection of structure in
velocity-position phase ... | 1994-11-17 | 2007-05-23 | [
"astro-ph"
] | Gerard Gilmore (Institute of Astronomy, Cambridge, UK) |
astro-ph/9411069 | Evolution of the Galactic Halo and Disk | Correlations between stellar kinematics and chemical abundances are fossil
evidence for evolutionary connections between Galactic structural components.
Extensive stellar surveys show that the only tolerably clear distinction
between galactic components appears in the distributions of specific angular
momentum. Here th... | 1994-11-17 | 2009-10-22 | [
"astro-ph"
] | Gerard Gilmore (Institute of Astronomy, Cambridge, UK) |
astro-ph/9411073 | Microlensing and Halo Cold Dark Matter | We discuss the implications of the more than 50 microlensing events seen by
the EROS, MACHO, and OGLE collaborations for the composition of the halo of our
galaxy. The event rates indicate that the halo mass fraction in MACHO's is less
than 30\%, consistent with expectations for a universe whose primary component
is co... | 1994-11-17 | 2009-10-22 | [
"astro-ph",
"hep-ph"
] | Evalyn I. Gates, Geza Gyuk, and Michael S. Turner |
astro-ph/9411072 | Protogalactic evolution and magnetic fields | We show that the relatively strong magnetic fields ($\ge 1 \mu$G) in high
redshift objects can be explained by the combined action of an evolving
protogalactic fluctuation and electrodynamic processes providing the magnetic
seed fields. Three different seed field mechanisms are reviewed and
incorporated into a spherica... | 1994-11-17 | 2007-05-23 | [
"astro-ph"
] | Harald Lesch and Masashi Chiba |
astro-ph/9411060 | Advection-Dominated Accretion Model for Sagittarius A$^*$: Evidence for
a $10^6\msun$ Black Hole at the Galactic Center | The enigmatic radio source Sagittarius A* at the centre of our Galaxy appears
to be a low-luminosity version of active galactic nuclei in other galaxies. By
analogy with active galactic nuclei models, it has been proposed that Sgr A*
may be a massive accreting black holes. The black hole hypothesis is, however,
problem... | 1994-11-16 | 2007-05-23 | [
"astro-ph"
] | Ramesh Narayan, Insu Yi, and Rohan Mahadevan |
astro-ph/9411066 | Eulerian Perturbation Theory in Non-Flat Universes: Second-Order
Approximation | The problem of solving perturbatively the equations describing the evolution
of self-gravitating collisionless matter in an expanding universe considerably
simplifies when directly formulated in terms of the gravitational and velocity
potentials: the problem can be solved {\it exactly}, rather than approximately,
even ... | 1994-11-16 | 2015-06-24 | [
"astro-ph"
] | Paolo Catelan, Francesco Lucchin, Sabino Matarrese & Lauro Moscardini |
astro-ph/9411067 | Dwarf Spheroidal Galaxies : Keystones of Galaxy Evolution | Dwarf spheroidal galaxies are the most insignificant extragalactic stellar
systems in terms of their visibility, but potentially very significant in terms
of their role in the formation and evolution of much more luminous galaxies. We
discuss the present observational data and their implications for theories of
the for... | 1994-11-16 | 2015-06-24 | [
"astro-ph"
] | John S. Gallagher III and Rosemary F.G. Wyse |
astro-ph/9411062 | Resurrection of Traditional Luminosity Evolution Models to Explain Faint
Field Galaxies | We explore the nature of the evolution of faint field galaxies by assuming
that the local luminosity function is not well defined. We use a non-negative
least squares technique to derive a near optimal set of local luminosity
functions for different spectral types of galaxies by fitting to the observed
optical and near... | 1994-11-16 | 2009-10-22 | [
"astro-ph"
] | Caryl Gronwall and David C. Koo |
astro-ph/9411065 | WHAT IS SGR A*? The Starved Black Hole in the Center of the Milky Way | Sgr A* is the unique 1 Jy flat spectrum radio point source located at the
dynamical center of the Galaxy and in the very center of the central star
cluster. Due to its unusual appearance it has long been speculated that this
source is powered by a supermassive black hole. The enormous increase in
observational data obt... | 1994-11-16 | 2007-05-23 | [
"astro-ph",
"gr-qc"
] | Heino Falcke |
astro-ph/9411064 | Radio pulsar and accretion regimes of rapidly rotating magnetic neutron
stars in early-type eccentric binaries | Rapidly rotating magnetic neutron stars in eccentric binary systems
containing an early type star provide a unique opportunity to investigate the
interplay between radio pulsar, stellar wind and accretion phenomena. We
summarise the radio pulsar-dominated and the accretion-dominated regimes,
discussing how the transiti... | 1994-11-16 | 2007-05-23 | [
"astro-ph"
] | S. Campana, L. Stella, S. Mereghetti & M. Colpi |
astro-ph/9411061 | The MACHO Project LMC Variable Star Inventory: I. Beat Cepheids -
Conclusive Evidence for the Excitation of the Second Overtone in Classical
Cepheids | We report the discovery of 45 beat Cepheids in the Large Magellanic Cloud
(LMC) using the MACHO Project photometry database. The variables which are
pulsating simultaneously in two radial modes are shown to break cleanly into
two period-ratio groups, providing the first unambiguous evidence that the
second overtone is ... | 1994-11-16 | 2010-03-19 | [
"astro-ph"
] | C. Alcock, R.A. Allsman, T.S. Axelrod, D.P. Bennett, K.H. Cook, K.C.
Freeman, K. Griest, S.L. Marshall, B.A. Peterson, M.R. Pratt, P.J. Quinn, J.
Reimann, A.W. Rodgers, C.W. Stubbs, W. Sutherland, and D.L. Welch (The MACHO
Collaboration) |
astro-ph/9411063 | ROSAT PSPC Observations of the Seyfert 1 Galaxies Ark 564, NGC 985, Kaz
163, MRK 79 and RX J 2256.6+0525 | We present spatial, temporal and spectral analyses of ROSAT Position
Sensitive Proportional Counter (PSPC) observations of the Seyfert 1 galaxies
Ark 564, NGC 985, Kaz 163, Mrk 79 and RX J2256.6+0525. Ark 564 is a powerful
narrow-line Seyfert 1 with strong Fe II emission. Several similar narrow-line
Seyfert 1 galaxies ... | 1994-11-16 | 2015-06-24 | [
"astro-ph"
] | W.N. Brandt, A.C. Fabian, K. Nandra, C.S. Reynolds, W. Brinkmann |
astro-ph/9411059 | Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars | We describe new optically thin solutions for rotating accretion flows around
black holes and neutron stars. These solutions are advection dominated, so that
most of the viscously dissipated energy is advected radially with the flow. We
model the accreting gas as a two temperature plasma and include cooling by
bremsstra... | 1994-11-15 | 2009-10-22 | [
"astro-ph"
] | Ramesh Narayan and Insu Yi |
astro-ph/9411055 | Statistical properties of the faint early-type galaxies sample: possible
effects of evolution | Early-type galaxies from CfA catalogue were assotiated with IRAS FSC sources.
In given sample IR and optical properties were used to obtain some
classification of these objects. The existance of significant classes can be
evidence of presence one main type of the dust in each galaxy. Physical
interpretation of obtained... | 1994-11-15 | 2007-05-23 | [
"astro-ph"
] | I.A.Trifalenkov |
astro-ph/9411056 | General Relativistic Hydrodynamics with a Roe solver | We present a numerical method to solve the equations of general relativistic
hydrodynamics in a given external gravitational field. The method is based on a
generalization of Roe's approximate Riemann solver for the non relativistic
Euler equations in Cartesian coordinates. The new method is applied to a set of
standar... | 1994-11-15 | 2007-05-23 | [
"astro-ph"
] | Frits Eulderink and Garrelt Mellema |
astro-ph/9411057 | Chemical Evolution of the Galaxy | Standard models for the chemical evolution of the Galaxy are reviewed with
particular emphasis on the history of the abundance gradients in the disk. The
effects on the disk structure and metallicity of gas accretion are discussed,
showing that a significant fraction of the current disk mass has been accreted
in the la... | 1994-11-15 | 2007-05-23 | [
"astro-ph"
] | M.Tosi |
astro-ph/9411058 | Advection-Dominated Accretion: Self-Similarity and Bipolar Outflows | We consider axisymmetric viscous accretion flows where a fraction f of the
viscously dissipated energy is advected with the accreting gas as stored
entropy and a fraction 1-f is radiated. When f is small (i.e. very little
advection), our solutions resemble standard thin disks in many respects except
that they have a ho... | 1994-11-15 | 2009-10-22 | [
"astro-ph"
] | Ramesh Narayan and Insu Yi |
astro-ph/9411051 | Spectroscopic Studies of the Two Eros Candidate Microlensed Stars | Low resolution spectroscopy, and UBVRI photometry, have been obtained for the
two EROS microlensing candidates. Radial velocities indicate that both stars
are members of the Large Magellanic Cloud. The spectrum and the colours of
EROS1, the first candidate, reveal that it is a moderately reddened
main-sequence B star w... | 1994-11-14 | 2007-05-23 | [
"astro-ph"
] | J.P. Beaulieu, R. Ferlet, Ph. Grison, A. Vidal-Madjar, J.P. Kneib, E.
Maurice, L. Prevot, C. Gry, J. Guibert, O. Moreau, F. Tajahmady, E. Aubourg,
P. Bareyre, S. Brehin, M. Gros, M. Lachieze-Rey, B. Laurent, E. Lesquoy, C.
Magneville, A. Milsztajn, L. Moscoso, F. Queinnec, J. Rich, M. Spiro, L.
Vigroux, S. Zylb... |
astro-ph/9411054 | Probing Early Clustering with Lyman-Alpha Absorption Lines Beyond the
Quasar Redshift | Groups and clusters of galaxies hosting a quasar can be found through the
detection of Lyman-alpha absorption lines beyond the quasar redshift. The
effect occurs whenever the distortion to the redshift distribution of
Lyman-alpha clouds induced by the cluster potential extends beyond the
proximity effect of the quasar.... | 1994-11-14 | 2009-10-22 | [
"astro-ph"
] | Abraham Loeb and Daniel J. Eisenstein (Harvard Univ.) |
astro-ph/9411052 | Using X-rays to Determine Which Compact Groups are Illusory | If the large-scale galaxy distribution is filamentary, as suggested by some
observations and recent hydrodynamical simulations, then lengthwise views of
filaments will apparently produce compact groups (CGs) that are in reality
stretched out along the line of sight. This possibility has been advocated
recently by Hernq... | 1994-11-14 | 2009-10-22 | [
"astro-ph"
] | Jeremiah P. Ostriker, Lori M. Lubin, and Lars Hernquist |
astro-ph/9411053 | Platelet Collapse Model of Pulsar Glitches | A platelet collapse model of starquakes is introduced. It displays
self-organized criticality with a robust power-law behavior. The simulations
indicate a near-constant exponent, whenever scaling is present. | 1994-11-14 | 2010-12-17 | [
"astro-ph"
] | P.D. Morley and Ivan Schmidt |
astro-ph/9411050 | Continuum Power Spectrum Components in X-Ray Sources: Detailed Modelling
and Search for Coherent Periodicities | This paper summarises two recently developed techniques in power spectral
analysis and their application to a sample of X-ray light curves of accreting
collapsed objects in active galactic nuclei and X-ray binaries. The first
technique is designed to carry out detailed model fitting of continuum power
spectrum componen... | 1994-11-13 | 2007-05-23 | [
"astro-ph"
] | L. Stella, E. Arlandi, G. Tagliaferri and G.L. Israel |
astro-ph/9411046 | Homogeneous Velocity-Distance Data for Peculiar Velocity Analysis. I.
Calibration of Cluster Samples | We have combined five Tully-Fisher (TF) redshift-distance samples for
peculiar velocity analysis: the cluster data of Han, Mould and coworkers
(1991-93, HM) and Willick (1991, W91CL), and the field data of Aaronson et al.
(1992), Willick (1991), Courteau & Faber (1992), and Mathewson et al. (1992),
totaling over 3000 s... | 1994-11-11 | 2009-10-22 | [
"astro-ph"
] | Jeffrey A. Willick, Stephane Courteau, Sandra M. Faber, David
Burstein, and Avishai Dekel |
astro-ph/9411045 | Substructures of Clusters and Cosmological Models | We investigate, using high resolution N-body simulations, the density
profiles and the morphologies of galaxy clusters in three models of structure
formation. We show that these properties are closely related to the occurrence
of a significant merging event to a cluster in the recent past. The three
models are: (1) the... | 1994-11-11 | 2007-05-23 | [
"astro-ph"
] | Y. P. Jing, H. J. Mo, G. Boerner, L. Z. Fang |
astro-ph/9411048 | The lens parallax method: determining the redshifts of the faint blue
galaxies through gravitational lensing | We propose a new technique, which we call the lens parallax method, to
determine simultaneously the redshift distribution of the faint blue galaxies
and the mass distribution of foreground clusters of galaxies. The method is
based on gravitational lensing and uses the fact that the mean angular size of
the faint blue g... | 1994-11-11 | 2007-05-23 | [
"astro-ph"
] | Ramesh Narayan and Matthias Bartelmann |
astro-ph/9411049 | Modern Cosmology and Structure Formation | An introduction to modern cosmology is given, focusing on theories for the
origin of structure in the Universe. After a brief review of the theory of
growth of cosmological perturbations and a summary of some important
observational results, most of the article is devoted to discussions of the
inflationary Universe sce... | 1994-11-11 | 2008-04-11 | [
"astro-ph",
"hep-ph"
] | Robert H. Brandenberger (Brown University) |
astro-ph/9411047 | Influence of Strings with Axionic Content on the Polarization of
Extragalactic Sources | It is shown that the axion concentrated in electroweak strings which are
consequently stabilized may produce a rotation of the polarization angle of
radiation from extragalactic sources larger than that caused by a background
field, and that axionic walls attached to global strings have an effect which
depends on the f... | 1994-11-11 | 2011-05-23 | [
"astro-ph",
"hep-ph"
] | Luis Masperi and Sandra Savaglio |
astro-ph/9411044 | Spectral Classification of Galaxies: An Orthogonal Approach | Classification of galaxy spectral energy distributions in terms of orthogonal
basis functions provides an objective means of estimating the number of
significant spectral components that comprise a particular galaxy type. We
apply the Karhunen-Lo\`{e}ve transform to derive a spectral eigensystem from a
sample of ten ga... | 1994-11-10 | 2011-05-05 | [
"astro-ph"
] | A.J. Connolly, A.S. Szalay (Johns Hopkins University), M.A. Bershady
(Penn State University), A.L. Kinney and D. Calzetti (STSci) |
astro-ph/9411040 | Collapse and Fragmentation of Cylindrical Magnetized Clouds. II.
Simulation with Nested Grid Scheme | Fragmentation process in a cylindrical magnetized cloud is studied with the
nested grid method. The nested grid scheme use 15 levels of grids with
different spatial resolution overlaid subsequently, which enables us to trace
the evolution from the molecular cloud density $\sim 100 {\rm cm}^{-3}$ to that
of the protoste... | 1994-11-10 | 2015-06-24 | [
"astro-ph"
] | Kohji Tomisaka (Niigata University) |
astro-ph/9411042 | Velocity Profile of the Ionized Disk and the Mass of the Black Hole in
M87 | We present a theoretical model for the ionized disk in M87 which includes
spiral shock waves. The line emission profiles computed from this model at
various positions on the disk are found to be in agreement with the recent
Hubble Space Telescope results. Based on this model, we find that the ionized
disk comprises two... | 1994-11-10 | 2009-10-22 | [
"astro-ph"
] | Sandip K. Chakrabarti |
astro-ph/9411041 | Chemical evolution models with a new stellar nucleosynthesis | Numerical models for the chemical evolution of the Galaxy have been computed
with the new stellar yields published by Maeder (1992). These metallicity
dependent yields represent an important improvement in the chemical evolution
of galaxies but there are still uncertainties in the stellar evolution which
prevent comple... | 1994-11-10 | 2015-06-24 | [
"astro-ph"
] | A. Giovagnoli, M. Tosi |
astro-ph/9411039 | Angular Momemtum and Large-Scale Magnetic Field in Textures Seeded
Models | We start by pedagigically reviewing the problem of large scale magnetic
fields. We explain the acquisition of angular momentum in the general context
of Dark Matter models and we use this result to derive a dynamical mechanism
for magnetic field generation. This mechanism does not produce any magnetic
field for standar... | 1994-11-10 | 2016-08-30 | [
"astro-ph"
] | Hugues Sicotte (Princeton University) |
astro-ph/9411043 | Gamma Ray Lines from the Orion Complex | We show that the 4.44 and 6.13 MeV line emission observed with COMPTEL from
Orion is consistent with gamma ray spectra consisting of a mixture of narrow
and broad lines or spectra containing only broad lines. We employed several
accelerated particle compositions and showed that the current COMPTEL data in
the 3--7 MeV ... | 1994-11-10 | 2009-10-22 | [
"astro-ph"
] | Reuven Ramaty, Benzion Kozlovsky, Richard E. Lingenfelter |
astro-ph/9411038 | The Particle- and Astro-Physics of Dark Matter | We review some recent determinations of the amount of dark matter on
galactic, cluster, and large scales, noting some puzzles and their possible
resolutions. We discuss the interpretation of big bang nucleosynthesis for dark
matter, and then review the motivation for and basic physics of several dark
matter candidates,... | 1994-11-09 | 2007-05-23 | [
"astro-ph",
"hep-ph"
] | Kim Griest |
astro-ph/9411037 | Images of HCO+ (1-0) Emission in a Molecular Cloud near 1E1740.7-2942 | We have observed the hard X-ray source 1E1740.7-2942 in the HCO+ (1-0) line
using the Owens Valley millimeter interferometer. Previous single dish
observations have found HCO+ emission coincident with the location of the radio
continuum hot spots of the radio source associated with 1E1740.7-2942. Our
higher resolution ... | 1994-11-09 | 2009-10-22 | [
"astro-ph"
] | J.A. Phillips (Owens Valley Radio Observatory) and T. Joseph W. Lazio
(Cornell University) |
astro-ph/9411036 | Does a Non-Magnetic Solar Chromosphere Exist? | Enhanced chromospheric emission which corresponds to an outwardly increasing
semiempirical temperature structure can be produced by wave motion without any
increase in the mean gas temperture. Hence, the sun may not have a classical
chromosphere in magnetic field free internetwork regions. Other significant
differences... | 1994-11-09 | 2009-10-22 | [
"astro-ph"
] | Mats Carlsson and Robert F. Stein |
astro-ph/9411032 | Comparing Models of Rapidly Rotating Relativistic Stars Constructed by
Two Numerical Methods | We present the first direct comparison of codes based on two different
numerical methods for constructing rapidly rotating relativistic stars. A code
based on the Komatsu-Eriguchi-Hachisu (KEH) method (Komatsu et al. 1989),
written by Stergioulas, is compared to the Butterworth-Ipser code (BI), as
modified by Friedman,... | 1994-11-08 | 2010-04-06 | [
"astro-ph",
"gr-qc"
] | Nikolaos Stergioulas and John L. Friedman |
astro-ph/9411033 | Gravitational Lensing and the Mass Distribution of Clusters | We review and discuss information on the mass distribution of galaxy clusters
obtained from gravitational lensing. | 1994-11-08 | 2009-10-22 | [
"astro-ph"
] | Matthias Bartelmann and Ramesh Narayan |
astro-ph/9411034 | Constraints on the Gamma-ray Burst Luminosity Function from PVO and
BATSE | We examine the width of the gamma-ray burst luminosity function through the
distribution of GRB peak fluxes as detected by the Pioneer Venus Orbiter (PVO)
and the Burst and Transient Source Experiment (BATSE). The strength of the
analysis is greatly enhanced by using a merged catalog of peak fluxes from both
instrument... | 1994-11-08 | 2016-08-30 | [
"astro-ph"
] | Andrew Ulmer, Ralph A.M.J. Wijers, and Edward E. Fenimore |
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