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/9409024 | Signatures of Bulge Triaxiality from Kinematics in Baade's Window/ | We study a sample of 62 Baade's Window (1,-4) K giants that have published
proper motions, radial velocity and metallicity. We construct the velocity
ellipsoids for the metal rich stars and metal poor stars. We find a vertex
deviation characteristic of a non-axisymmetric system. The long axes of the
velocity ellipsoids... | 1994-09-12 | 2019-08-17 | [
"astro-ph"
] | HongSheng Zhao, D.N.Spergel, R.M.Rich |
astro-ph/9409025 | A Search for the Radio Counterpart to the March 1, 1994 Gamma Ray Burst | We report on the results of a search for the radio counterpart to the bright
gamma-ray burst of March 1, 1994. Using the Dominion Radio Astrophysical
Observatory Synthesis Telescope sensitive, wide-field radio images at 1.4 GHz
and 0.4 GHz were made of a region around GRB940301. A total of 15 separate
radio images were... | 1994-09-12 | 2009-10-22 | [
"astro-ph"
] | Frail, Kulkarni, Hurley, Fishman, Kouveliotou, Meegan, Sommer, Boer,
Niel, and Cline |
astro-ph/9409023 | New observational limits on dynamo saturation in young solar-type stars | We present statistically robust observational evidence which imposes new
limits on dynamo saturation in young solar-type stars. These are inferred from
the increasing amplitude of the V-band optical flux with rotation, caused by
the filling of the disc with surface spots in a non-axisymmetric pattern.
Assuming spot cov... | 1994-09-12 | 2007-05-23 | [
"astro-ph"
] | Mark A. O'Dell, Peter M. Panagi, Martin A. Hendry and Andrew
Collier-Cameron(University of Sussex, Brighton BN1 9QH) |
astro-ph/9409022 | Microlensing by the Galactic Bar | We compute the predicted optical depth and duration distribution of
microlensing events towards Baade's window in a model composed of a Galactic
disk and a bar. The bar model is a self-consistent dynamical model built out of
individual orbits that has been populated to be consistent with the COBE maps
of the Galaxy and... | 1994-09-11 | 2009-10-22 | [
"astro-ph"
] | HongSheng Zhao (1), David N. Spergel (2), R. Michael Rich (1) ((1)
Columbia U., (2) Princeton U.) |
astro-ph/9409019 | Variability of Accretion Disks Surrounding Black Holes ----- the Role of
Inertial-Acoustic Mode Instabilities | The global nonlinear time-dependent evolution of the inertial-acoustic mode
instability in accretion disks surrounding black holes has been investigated.
The viscous stress is assumed to be proportional to the gas pressure only,
i.e.\,, $\tau = - \alpha p_g$. It is found that an oscillatory instability
exists in the in... | 1994-09-09 | 2009-10-22 | [
"astro-ph"
] | Xingming Chen and Ronald E. Taam (Northwestern University) |
astro-ph/9409020 | An Arcminute Resolution Search at 4.7CM^-1 for Point Sources in Msam and
Max Fields | We have searched for mm-wave emission from compact objects in two fields,
each approximately 1 square degree in size, taken from regions of the sky in
which degree-scale structure in the Cosmic Background Radiation (CBR) has
recently been reported. The observations were made at frequency of 4.7~cm^-1
and with an angula... | 1994-09-09 | 2007-05-23 | [
"astro-ph"
] | S.E. Church, P.D. Mauskopf, P.A.R. Ade, M.J. Devlin, W.L. Holzapfel,
T.M. Wilbanks, A.E. Lange |
astro-ph/9409018 | Thermal Equilibria of Accretion Disks | We show that most of hot, optically thin accretion disk models which ignore
advective cooling are not self-consistent. We have found new types of optically
thin disk solutions where cooling is dominated by radial advection of heat.
These new solutions are thermally and viscously stable. | 1994-09-09 | 2009-10-22 | [
"astro-ph"
] | Marek A. Abramowicz, Xingming Chen, Shoji Kato, Jean-Pierre Lasota,
and Oded Regev |
astro-ph/9409021 | A New Parallel N-body Gravity Solver: TPM | We have developed a gravity solver based on combining the well developed
Particle-Mesh (PM) method and TREE methods. It is designed for and has been
implemented on parallel computer architectures. The new code can deal with tens
of millions of particles on current computers, with the calculation done on a
parallel supe... | 1994-09-09 | 2009-10-22 | [
"astro-ph"
] | Guohong Xu |
astro-ph/9409017 | Gravitational Collapse of Small-Scale Structure as the Origin of the
Lyman Alpha Forest | If gravitational clustering is a hierarchical process, the present
large-scale structure of the galaxy distribution implies that structures on
smaller scales must have formed at high redshift. We simulate the formation of
small-scale structure (average cell mass: $\Delta \bar m_b=10^{4.2}$M$_\odot$)
and the evolution o... | 1994-09-08 | 2009-10-22 | [
"astro-ph"
] | Renyue Cen, Jordi Miralda-Escude, Jeremiah P. Ostriker and Michael
Rauch (Princeton University Observatory, Princeton, NJ USA) |
astro-ph/9409014 | Models of Galaxies with Central Black Holes: Simulation Methods | We present a method for simulating numerically the effect of the adiabatic
growth of black holes on the structure of elliptical galaxies. Using a parallel
self--consistent field code, we add black holes to N--body realizations of
model distribution functions for spherical galaxies, using a continuous
mass--spectrum. Th... | 1994-09-07 | 2009-10-22 | [
"astro-ph"
] | Steinn Sigurdsson, Lars Hernquist and Gerald D. Quinlan |
astro-ph/9409016 | Assessing the Accuracy of Masses and Spatial Correlations of Galaxy
Groups | Two algorithms for the identification of galaxy groups from redshift surveys
are tested by application to simulated data derived from N-body simulation. The
accuracy of the membership assignments by these algorithms is studied in a
companion to this paper (Frederic 1994). Here we evaluate the accuracy of group
mass est... | 1994-09-07 | 2009-10-22 | [
"astro-ph"
] | James J. Frederic |
astro-ph/9409015 | Testing the Accuracy of Redshift Space Group Finding Algorithms | Using simulated redshift surveys generated from a high resolution N-body
cosmological structure simulation, we study algorithms used to identify groups
of galaxies in redshift space. Two algorithms are investigated; both are
friends-of-friends schemes with variable linking lengths in the radial and
transverse dimension... | 1994-09-07 | 2009-10-22 | [
"astro-ph"
] | James J. Frederic |
astro-ph/9409013 | Star Formation in Dwarf Irregular Galaxies: NGC 6822 | Our proposed method to study the star formation histories in nearby
irregulars is here applied to NGC 6822. To this purpose we have obtained
accurate CCD photometry of three regions in the galaxy, reaching V$\simeq$23.5
with an accuracy of $\sigma_{BVR}\leq$0.1 mag. The comparison of the
observational color-magnitude d... | 1994-09-06 | 2009-10-22 | [
"astro-ph"
] | G. Marconi, M. Tosi, L. Greggio and P. Focardi |
astro-ph/9409011 | The Shapes of Galaxy Clusters | We have reanalyzed a data set of 99 low redshift ($ z < 0.1 $) Abell clusters
and determined their shapes. For this, three different measures are used. We
use Monte-Carlo simulations to investigate the errors in the methods. The
corrected distribution of cluster ellipticities shows a peak at $ \epsilon \sim
0.4 $ and e... | 1994-09-06 | 2015-06-24 | [
"astro-ph"
] | P.A.M. de Theije, P. Katgert, E. van Kampen |
astro-ph/9409012 | Rapid Stochastic Acceleration of Protons to Energies Above 100~TeV in
the Accretion Column Of Hercules X-1 | An investigation into the acceleration of protons by scattering off
relativistic Alfv\'{e}n waves in the accretion column of Hercules X-1 is
presented. The mechanism is shown to achieve mean particle energies of 30~TeV
under very reasonable assumptions about the environment, and 250~TeV is
available under some circumst... | 1994-09-06 | 2009-10-22 | [
"astro-ph"
] | P. A. Johnson |
astro-ph/9409010 | Limits on possible magnetic fields at nucleosynthesis time | In this paper we discuss limits on magnetic fields that could have been
present at nucleosynthesis time. We considered several effects that could be
relevant modifing light elements relic abundances. They include: changes in
reaction rates, mass shifts due to strong and electromagnetic interactions,
variation of the ex... | 1994-09-05 | 2011-05-23 | [
"astro-ph"
] | D. Grasso and H.R. Rubistein |
astro-ph/9409009 | Generalized Van Cittert Zernike Theorem in Curved Spacetime - Some
Astrophysical Applications | The {\em Van Cittert Zernike} theorem consists of a simple relation between
the measured coherence of the radiation and the characteristics of the emitting
stochastic source. In the present work, an extension of the theorem to
partially correlated sources in curved spacetime is derived. The generalized
theorem is used ... | 1994-09-03 | 2007-05-23 | [
"astro-ph"
] | G. Hazak and R. Zamir |
astro-ph/9409006 | The Spatial Distribution, Kinematics, and Dynamics of the Galaxies in
the Region of Abell 2634 and 2666 | A total of 663 galaxies with known redshifts in a $6\deg\!\times 6\deg$ field
centered on A2634, including 211 new measurements, are used to study the
structure of this cluster and its surroundings. Two samples, ---one containing
200 galaxies within two degrees from the cluster center and a second,
magnitude-limited, o... | 1994-09-02 | 2009-10-22 | [
"astro-ph"
] | Marco Scodeggio, Jos\'e M. Solanes, Riccardo Giovanelli, and Martha P.
Haynes |
astro-ph/9409007 | Spectroscopy of the Double Quasars Q1343+266AB: I. a New Determination
of the Size of Lyman-Alpha Forest Absorbers | We have obtained spectroscopy of Q 1343+266 AB, a pair of quasars at redshift
z = 2.03 with a projected separation of 9.5 arcseconds. This system is
well-suited for probing the Ly-alpha forest, since the two component spectra
show several Ly-alpha lines in common and several others not. Using Bayesian
statistics, under... | 1994-09-02 | 2009-10-22 | [
"astro-ph"
] | Jill Bechtold, Arlin P.S. Crotts, Robert C. Duncan & Yihu Fang |
astro-ph/9409004 | Electromagnetic Cascades and Cascade Nucleosynthesis in the Early
Universe | We describe a calculation of electromagnetic cascading in radiation and
matter in the early universe initiated by the decay of massive particles or by
some other process. We have used a combination of Monte Carlo and numerical
techniques which enables us to use exact cross sections, where known, for all
the relevant pr... | 1994-09-02 | 2011-05-12 | [
"astro-ph"
] | R.J. Protheroe, T. Stanev and V.S. Berezinsky |
astro-ph/9409008 | Spectroscopy of the Double Quasars Q1343+264 Ab: II. the Relationship
between Galaxies Ans QSO C~IV Absorption Lines - | We present spectra of QSOs 1343+266 A B, covering Ly-beta to C~IV emission at
2\AA~resolution, and find further evidence that this system is not
gravitationally lensed. We see, however, a large number of Ly-alpha and some
C~IV absorption features common to both spectra. The frequency of C~IV lines in
common indicates t... | 1994-09-02 | 2009-10-22 | [
"astro-ph"
] | Arlin P.S. Crotts, Jill Bechtold, Yihu Fang & Robert C. Duncan |
astro-ph/9409005 | The 1-Point Cluster Distribution Function and its Moments | We derive the 1-point probability density function of the smoothed 3-D
Abell-ACO cluster density field and we compare it with that of artificial
cluster samples, generated as high peaks of a Gaussian field in such a way that
they reproduce the low-order (2- and 3-point) correlation functions and the
observed cluster se... | 1994-09-02 | 2015-06-24 | [
"astro-ph"
] | M.Plionis and R.Valdarnini |
astro-ph/9409002 | Microlensing Maps for the Galactic Bulge | Microlensing maps -- that is, contours of equal numbers of events per $10^6$
source stars -- are provided for the inner Galaxy under two alternative
hypotheses : (1) the bulge is an oblate axisymmetric spheroid or (2) the bulge
is a prolate bar. Oblate spheroids yield a total of $\sim 12$ events per year
per $10^6$ sta... | 1994-09-01 | 2009-10-22 | [
"astro-ph"
] | N.W. Evans |
astro-ph/9409003 | The COBE Normalization for Standard CDM | The COBE detection of CMB anisotropies provides the best way of fixing the
amplitude of fluctuations on the largest scales. This normalization is usually
given for an n=1 spectrum, including only the anisotropy caused by the Sachs-
Wolfe effect. This is certainly not a good approximation for a model containing
any reas... | 1994-09-01 | 2009-10-22 | [
"astro-ph"
] | E.F.Bunn, D.Scott & M.White |
astro-ph/9409001 | Transverse Velocities of Galaxies From Microlens Parallaxes | The transverse velocity of a spiral galaxy can be measured to an accuracy
$\sim 60\,\kms$ by making parallax observations of quasars being microlensed by
stars in the disk of the galaxy. To make the measurement, a quasar must be
located behind the disk of the galaxy between about 1 and 2 scale lengths from
the center. ... | 1994-09-01 | 2007-05-23 | [
"astro-ph"
] | Andrew Gould |
astro-ph/9408102 | Big Bang Nucleosynthesis and Dark Matter: Baryons and Neutrinos | I present a review of Big Bang Nucleosynthesis, concentrating on the
statistical analysis of theoretical uncertainties, and on systematic errors in
observed abundances. Both have important implications for constraints on the
amount of baryonic dark matter and the number of light neutrino species in
nature. Without allo... | 1994-08-31 | 2008-02-03 | [
"astro-ph",
"hep-ph"
] | Lawrence M. Krauss |
astro-ph/9408103 | Cosmic Microwave Anisotropies from Topological Defects in an Open
Universe | We present a general formalism for computing Cosmic Background Radiation
(CBR) and density fluctuations in open models with stiff sources. We find
analytic Green's functions for the linearized Einstein equations in the
presence of stiff sources and use this formalism to estimate the amplitude and
harmonic spectrum of m... | 1994-08-31 | 2010-11-01 | [
"astro-ph",
"gr-qc"
] | Ue-Li Pen and David N. Spergel |
astro-ph/9408104 | Matter Distribution for Power Spectra with Broken Scale Invariance | To test the primordial power spectra predicted by a double inflationary model
with a break of amplitude $\Delta=3$ at a scale of $2\pi/k\approx 10 \hm$ and
CDM as dominant matter content, we perform PM simulations with 128$^3$
particles on a 256$^3$ grid. The broken scale invariance of the power spectra
explains the ex... | 1994-08-31 | 2010-11-30 | [
"astro-ph"
] | L. Amendola, S. Gottloeber, J. P. Muecket, and V. Mueller |
astro-ph/9408099 | Whither do the microlensing Brown Dwarfs rove? | The EROS and MACHO collaborations have reported observations of light curves
of stars in the Large Magellanic Cloud that are compatible with gravitational
microlensing by intervening massive objects, presumably Brown-Dwarf stars. The
OGLE and MACHO teams have also seen similar events in the direction of the
galactic Bu... | 1994-08-31 | 2015-06-24 | [
"astro-ph",
"hep-ph"
] | A. de Rujula, G. Giudice, S. Mollerach and E. Roulet |
astro-ph/9408101 | Statistical Uncertainties in Temperature Diagnostics for Hot Coronal
Plasma Using the ASCA SIS | Statistical uncertainties in determining the temperatures of hot (0.5 keV to
10 keV) coronal plasmas are investigated. The statistical precision of various
spectral temperature diagnostics is established by analyzing synthetic ASCA
Solid-state Imaging Spectrometer (SIS) CCD spectra. The diagnostics considered
are the r... | 1994-08-31 | 2009-10-22 | [
"astro-ph"
] | Douglas A. Swartz, S. L. O'Dell, M.E. Sulkanen, and A.F. Tennant |
astro-ph/9408100 | An Extended Galactic Population of Low-Luminosity X-Ray Sources (CVs?)
and the Diffuse X-Ray Background | Summary of abstract: The existence of a new population of yet unrecognized
x-ray sources has been often suggested to resolve some pecularities in the
properties of the x-ray background (XRB), and has recently been indicated by an
analysis of resolved sources in deep ROSAT observations (Hasinger \etal 1993).
We invest... | 1994-08-31 | 2009-10-22 | [
"astro-ph"
] | Eyal Maoz and Jonathan Grindlay |
astro-ph/9408098 | The Richness of the Globular Cluster System of NGC 3923: Clues to
Elliptical Galaxy Formation | We present new data on the globular cluster system of the elliptical galaxy
NGC 3923 which show that it has the most globular clusters per unit luminosity
of any non-cluster elliptical yet observed, with $S_N=6.4 \pm1.4$. NGC 3923 is
also among the brightest ellipticals outside of a galaxy cluster for which the
number ... | 1994-08-30 | 2009-10-22 | [
"astro-ph"
] | S.E. Zepf, D. Geisler, and K.M. Ashman |
astro-ph/9408096 | The Density of 1-Jansky Sources Around Zwicky Clusters | In a recent paper by Rodrigues-Williams \& Hogan (RH94), a correlation
between high-redshift, optically-selected QSOs and Zwicky clusters was reported
at a very high significance level. Due to the fairly bright flux threshold of
the cluster sample, these correlations cannot be interpreted as being due to an
environment... | 1994-08-30 | 2007-05-23 | [
"astro-ph"
] | Stella Seitz and Peter Schneider |
astro-ph/9408097 | On the RMS Anisotropy at 7 degrees and 10 degrees Observed in the
COBE-DMR Two Year Sky Maps | The frequency-independent RMS temperature fluctuations determined from the
COBE-DMR two year sky maps are used to infer the parameter Q_{rms-PS}, which
characterizes the normalization of power law models of primordial cosmological
temperature anisotropy. In particular, a 'cross'-RMS statistic is used to
determine Q_{rm... | 1994-08-30 | 2007-05-23 | [
"astro-ph"
] | A.J. Banday, K.M. Gorski, L. Tenorio, E.L. Wright, G.F. Smoot, C.H.
Lineweaver, A. Kogut, G. Hinshaw, & C.L. Bennett |
astro-ph/9408088 | Quasar-galaxy associations | There is controversy about the measurement of statistical associations
between bright quasars and faint, presumably foreground galaxies. We look at
the distribution of galaxies around an unbiased sample of 63 bright, moderate
redshift quasars using a new statistic based on the separation of the quasar
and its nearest n... | 1994-08-29 | 2015-06-24 | [
"astro-ph"
] | P.A. Thomas, R.L. Webster and M.J. Drinkwater |
astro-ph/9408092 | Non-Linear Cluster Lens Reconstruction | We develop a method for general non-linear cluster lens reconstruction using
the observable distortion of background galaxies. The distortion measures the
combination $\gamma/(1-\kappa)$ of shear $\gamma$ and surface density $\kappa$.
From this we obtain an expression for the gradient of $\log (1 - \kappa)$ in
terms of... | 1994-08-29 | 2009-10-22 | [
"astro-ph"
] | Nick Kaiser |
astro-ph/9408093 | Primordial Non-Gaussian Signatures in the Sky | The presence of non-Gaussian features in the CMB radiation maps represents
one of the most long-awaited clues in the search for the actual structure of
the primordial radiation. These features could shed some light on the non
trivial task of distinguishing the real source of the primeval perturbations
leading to large ... | 1994-08-29 | 2009-10-22 | [
"astro-ph"
] | Alejandro Gangui (SISSA) |
astro-ph/9408089 | Gravitational instability in the strongly nonlinear regime: A study of
various approximations | We study the development of gravitational instability in the strongly
non-linear regime. For this purpose we use a number of statistical indicators
such as filamentary statistics, spectrum of overdense/underdense regions and
the void probability function, each of which probes a particular aspect of
gravitational cluste... | 1994-08-29 | 2015-06-24 | [
"astro-ph"
] | B.S. Sathyaprakash, V. Sahni, D. Munshi, D. Pogosyan, A. L. Melott |
astro-ph/9408095 | Point Sources in the Cosmic Microwave Background? | Non-Gaussian imprints on the cosmic microwave background radiation (CBR) sky
are within the grasp of current experiments. A clear non-Gaussian signature
would be point-like sources. We have examined the nature of possible point
sources that were tentatively identified in a recent high frequency CBR
experiment with half... | 1994-08-29 | 2009-09-25 | [
"astro-ph"
] | Xiaochun Luo and J. Silk |
astro-ph/9408091 | The Long Period AM Her-like Cataclysmic Variable RXJ051541+0104.6 | We report the discovery of a new catacysmic variable system,
RXJ051541+0104.6. The optical spectrum has a blue continuum with superposed H~I
and He~I and II emission lines. The soft X-ray spectrum is well fit with a
50~eV black body. The X-ray and optical data are suggestive of an AM~Herculis
system. The X-ray light cu... | 1994-08-29 | 2009-10-22 | [
"astro-ph"
] | F. M. Walter, S. J. Wolk, and N. R. Adams (ESS Dept, SUNY Stony Brook) |
astro-ph/9408090 | Optical Radii of Galaxy Clusters | We analyze the density profiles and virial radii for a sample of 90 nearby
clusters, using galaxies with available redshifts and positions. Each cluster
has at least 20 redshifts measured within an Abell radius, and all the results
come from galaxy sets of at least 20 members. Most of the density profiles of
our cluste... | 1994-08-29 | 2009-10-22 | [
"astro-ph"
] | M. Girardi, A. Biviano, G. Giuricin, F. Mardirossian, and M. Mezzetti |
astro-ph/9408094 | Baryonic Dark Matter and the Diffuse Gamma Ray Background | We show that the baryonic gas content of the halo of our galaxy can be probed
by performing a multipole expansion on the distribution of diffuse background
gamma-ray emission. While the monopole moment (isotropic background) can be
used to constrain the baryonic fraction of the halo gas, the quadrupole to
monopole rati... | 1994-08-29 | 2009-09-25 | [
"astro-ph"
] | Xiaochun Luo and J. Silk |
astro-ph/9408087 | A search for the associations of distant radio-bright quasars with Abell
clusters: an effect of gravitational amplification bias ? | The theory predicts that the effect of gravitational lensing by the matter
associated with clusters of galaxies can magnify background sources, leading to
an enhancement of source number density around foreground clusters of galaxies.
We conduct a search for the associations of distant radio-bright quasars with
Abell c... | 1994-08-27 | 2015-06-24 | [
"astro-ph"
] | Xiang-Ping Wu and Jinlin Han |
astro-ph/9408086 | Non-Parametric Dynamical Analysis of Globular Clusters: M15, 47~Tuc,
NGC~362, and NGC~3201 | We use radial velocities of member stars and cluster surface brightness
profiles to non-parametrically determine the mass density profiles and
isotropic phase-space distribution functions $f(E)$ for the globular clusters
M15 (NGC7078), 47~Tuc (NGC104), NGC~362, and NGC~3201. Assuming isotropy and
using the velocity dis... | 1994-08-26 | 2009-10-22 | [
"astro-ph"
] | Karl Gebhardt and Philippe Fischer |
astro-ph/9408084 | Parameter degeneracy in models of the quadruple lens system Q2237+0305 | The geometry of the quadruple lens system Q2237+0305 is modeled with a simple
astigmatic lens: a power-law mass distribution: m \propto r^\beta with an
external shear \gamma. The image positions can be reproduced with an accuracy
better than 0.01 arcsec for any 0.0 < \beta < 1.85 and the corresponding value
of \gamma =... | 1994-08-26 | 2009-10-22 | [
"astro-ph"
] | Joachim Wambsganss and Bohdan Paczynski |
astro-ph/9408085 | Sky Subtraction with Fiber-Spectrographs | The sky subtraction performances of multi-fiber spectrographs are discussed,
analysing in detail the case of the OPTOPUS system at the 3.6 meter ESO
telescope at La Silla. A standard technique, based on flat-fields obtained with
a uniformly illuminated screen on the dome, provides poor results. A new method
has been de... | 1994-08-26 | 2009-10-22 | [
"astro-ph"
] | C. Lissandrini, S. Cristiani, F. La Franca |
astro-ph/9408083 | Deep Imaging of the Double Quasar 0957+561: New Constraints on H_0 | We present new results from extremely deep, high-resolution images of the
field around the double quasar QSO 0957+561. A possible gravitational arc
system near the double quasar has recently been reported, which, if real, would
set strong constraints on determinations of the Hubble constant from the time
delay in the d... | 1994-08-25 | 2009-10-22 | [
"astro-ph"
] | H. Dahle, S.J. Maddox and Per B. Lilje |
astro-ph/9408082 | Arc Statistics with Realistic Cluster Potentials. II. Influence of
Cluster Asymmetry and Substructure | We construct a sample of numerical models for clusters of galaxies and employ
these to investigate their capability of imaging background sources into long
arcs. Emphasis is laid on the statistics of these arcs. We study cross sections
for arc length and length-to-width ratio and optical depths for these arc
properties... | 1994-08-24 | 2007-05-23 | [
"astro-ph"
] | Matthias Bartelmann, Matthias Steinmetz, and Achim Weiss |
astro-ph/9408080 | The Cloud-in-Cloud Problem in the Press-Schechter Formalism of
Hierarchical Structure Formation | The formalism by Press and Schechter (PS) is often used to infer number
densities of virialized objects of mass M (e.g. quasars, galaxies, clusters of
galaxies, etc.) from a count of initially overdense regions in a Gaussian
density perturbation field. We reanalyze the PS-formalism by explicitly
counting underdense reg... | 1994-08-24 | 2009-10-22 | [
"astro-ph"
] | K. Jedamzik |
astro-ph/9408081 | Baryon Number Transport in a Cosmic QCD-Phase Transition | We investigate the transport of baryon number across phase boundaries in a
putative first order QCD-phase transition. Two independent phenomenological
models are employed to estimate the baryon penetrability at the phase boundary:
chromoelectric flux tube models; and an analogy to baryon-baryon coalescence in
nuclear p... | 1994-08-24 | 2009-10-22 | [
"astro-ph"
] | K. Jedamzik and G.M. Fuller |
astro-ph/9408079 | Paramagnetic alignment of fractal grains | Paramagnetic alignment of fractal suprathermally rotating grains is
discussed. It is shown that if the concentration of H$_{2}$formation sites is
low and resurfacing is active, fractal structure of grains enhances their
alignment. Studying the influence of grain surface physics and chemistry on the
alignment we found t... | 1994-08-23 | 2007-05-23 | [
"astro-ph"
] | A. Lazarian |
astro-ph/9408078 | String Radiative Backreaction | We discuss radiative backreaction for global strings described by the
Kalb-Ramond action with an analogous derivation to that for the point electron
in classical electrodynamics. We show how local corrections to the equations of
motion allow one to separate the self-field of the string from that of the
radiation-field.... | 1994-08-22 | 2009-10-22 | [
"astro-ph",
"hep-ph",
"hep-th"
] | R.A. Battye and E.P.S. Shellard |
astro-ph/9408077 | Self-Consistent Particle Acceleration in Active Galactic Nuclei | Adopting the hypothesis that the nonthermal emission of Active Galactic
Nuclei (AGN) is primarily due to the acceleration of protons, we construct a
simple model in which the interplay of acceleration and losses can be studied
together with the formation of the emitted spectrum. The acceleration process
is assumed to b... | 1994-08-22 | 2008-02-03 | [
"astro-ph"
] | A. Mastichiadis J. G. Kirk |
astro-ph/9408076 | Probing the Era of Galaxy Formation via TeV Gamma Ray Absorption by the
Near Infrared Extragalactic Background | We present models of the extragalactic background light (EBL) based on
several scenarios of galaxy formation and evolution. We have treated galaxy
formation with the Press-Schecter approximation for both cold dark matter (CDM)
and cold+hot dark matter (CHDM) models. Galaxy evolution has been treated by
considering a va... | 1994-08-21 | 2008-02-03 | [
"astro-ph",
"hep-ph"
] | Donn MacMinn and Joel R. Primack |
astro-ph/9408075 | Astrometric Plate Reduction with Orthogonal Functions and
Milli-Arcseconds Accuracy in Deep Proper Motion Surveys | We have been doing a sample survey in UBV photometry and proper motions as
part of an investigation of galactic structure and evolution. The programme is
based on Schmidt plates (from OCA, Tautenburg, Palomar and ESO Schmidt
telescopes) digitized with the MAMA machine (CAI, Paris). The high astrometric
quality of the M... | 1994-08-21 | 2007-05-23 | [
"astro-ph"
] | Devendra Ojha and Olivier Bienayme |
astro-ph/9408074 | The Asymmetric Drift of the Thick Disk Population | We investigate the kinematics of the intermediate population using the
photometric and astrometric sample surveys towards two opposite directions
(galactic centre and anticentre) at intermediate latitude. A multivariate
discriminant analysis (MDA) is used to distinguish the `Thick Disk' from other
populations with the ... | 1994-08-21 | 2007-05-23 | [
"astro-ph"
] | Devendra Ojha, Annie C. Robin and Olivier Bienayme |
astro-ph/9408073 | Counts and Colours of Faint Stars in 5 Fields Near the North Galactic
Pole | Faint star number counts in the photographic \jmag band and \bvcol colour
distributions are presented for a 1.08 deg$^2$ field near the North Galactic
Pole. Due to the excellent star/galaxy discrimination we count stars as faint
as \jmag = 23. We compare the number counts and colour distributions in 5
adjacent fields n... | 1994-08-19 | 2007-05-23 | [
"astro-ph"
] | L. Infante |
astro-ph/9408072 | The Medium Redshift Clusters CL0017-20 and CL0500-24 | We present magnitudes and redshifts of galaxies in the cluster of galaxies
CL0017-20 and in the double cluster CL0500-24. Luminosity functions and
velocity distributions have been derived. CL0017-20 possesses a virial mass of
$2.9 \times 10^{14}$ M$_\odot$ and a \vmag band luminosity of $2.3 \pm 0.5
\times 10^{12}$ L$_... | 1994-08-19 | 2007-05-23 | [
"astro-ph"
] | L. Infante, P Fouque, G. Hertling, M.J. Way, E. Giraud and H. Quintana |
astro-ph/9408071 | The Clustering Properties of Faint Galaxies | The two-point angular correlation function of galaxies, \wte, has been
computed from a new survey of faint galaxies covering a 2 deg$^2$ area near the
North Galactic Pole. This survey, which is complete to limiting magnitudes
\jmag=24 and \fmag=23, samples angular scales as large as $1\degpoint5$. Faint
galaxies are fo... | 1994-08-19 | 2009-10-22 | [
"astro-ph"
] | L. Infante and C.J. Pritchet |
astro-ph/9408070 | Gaussian Statistics of the Cosmic Microwave Background: Correlation of
Temperature Extrema In the COBE DMR Two-Year Sky Maps | We use the two-point correlation function of the extrema points (peaks and
valleys) in the COBE Differential Microwave Radiometers (DMR) 2-year sky maps
as a test for non-Gaussian temperature distribution in the cosmic microwave
background anisotropy. A maximum likelihood analysis compares the DMR data to
n=1 toy model... | 1994-08-19 | 2011-05-10 | [
"astro-ph"
] | A. Kogut, A.J. Banday, C.L. Bennett, G. Hinshaw, P.M. Lubin, and G.F.
Smoot |
astro-ph/9408064 | The complex theory of gravitational lensing: Beltrami equation and
cluster lensing | We introduce a new complex formalism to describe arclet fields in clusters of
galaxies and derive the appropriate inversion techniques to find the related
mass distribution of the lensing cluster. Applying the complex formalism to the
statistics of lensed background sources shows that the mean of the axial ratios
of lo... | 1994-08-18 | 2007-05-23 | [
"astro-ph"
] | T. Schramm, R. Kayser |
astro-ph/9408065 | Galaxy Formation in a Variety of Hierarchical Models | We predict the observable properties of the galaxy population in popular
hierarchical models of galaxy formation. We employ a detailed semianalytic
procedure which incorporates the formation and merging of dark matter halos,
the shock heating and radiative cooling of gas, self-regulated star formation,
the merging of g... | 1994-08-18 | 2015-06-24 | [
"astro-ph"
] | Jeremy S. Heyl, Shaun Cole, Carlos S. Frenk and Julio F. Navarro |
astro-ph/9408067 | The Assembly of Galaxies in a Hierarchically Clustering Universe | We study the formation of galaxies by using $N$-body/hydrodynamics
simulations to investigate how baryons collect at the centre of dark matter
halos. We treat the dark matter as a collisionless fluid and the baryons as an
ideal gas. We include the effects of gravity, pressure gradients,
hydrodynamical shocks, and radia... | 1994-08-18 | 2015-06-24 | [
"astro-ph"
] | Julio F. Navarro, Carlos S. Frenk, and Simon D.M. White |
astro-ph/9408068 | The Damping and Excitation of Galactic Warps by Dynamical Friction | We investigate the dynamical interaction of galactic warps with the
surrounding dark matter halo, using analytic perturbation theory. A precessing
warp induces a density wake in the collisionless dark matter, which acts back
on the original warp, transferring energy and angular momentum between the warp
and halo (dynam... | 1994-08-18 | 2015-06-24 | [
"astro-ph"
] | Robert W. Nelson and Scott Tremaine |
astro-ph/9408069 | Simulations of X-ray Clusters | We present simulations of the formation and evolution of galaxy clusters in
the Cold Dark Matter cosmogony. Clusters with a wide range of mass were
selected from previous N-body models, and were resimulated at higher resolution
using a combined N-body/Smooth Particle Hydrodynamics code. The effects of
radiative cooling... | 1994-08-18 | 2015-06-24 | [
"astro-ph"
] | Julio F. Navarro, Carlos S. Frenk, and Simon D.M. White |
astro-ph/9408066 | Interpreting Large Scale Structure Observations | The standard model of large scale structure is considered, in which the
structure originates as a Gaussian adiabatic density perturbation with a nearly
scale invariant spectrum. The basic theoretical tool of cosmological
perturbation theory is described, as well as the possible origin of the density
perturbation as a v... | 1994-08-18 | 2007-05-23 | [
"astro-ph",
"hep-ph"
] | David H Lyth and Andrew R Liddle |
astro-ph/9408057 | A comparison of the evolution of the density field in perturbation
theory and numerical simulations - II Counts in cells analysis | We present a detailed comparison of the predictions of perturbation theory
for the averaged J-point correlation functions, $\xibar_J$, with the results of
numerical simulations of gravitational clustering. We have carried out a
systematic analysis of this method using ensembles of simulations with
different numbers of ... | 1994-08-17 | 2015-06-24 | [
"astro-ph"
] | C.M.Baugh, E. Gaztanaga and G.Efstathiou |
astro-ph/9408063 | Duration Distributions of Bright and Dim BATSE Gamma-Ray Bursts | We have measured the T90 and T50 durations of bright and dim gamma-ray bursts
(GRBs) detected by the Compton Gamma Ray Observatory's Burst and Transient
Source Experiment (BATSE). The T90 (T50) duration is defined as the interval
over which 5\% (25\%) to 95\% (75\%) of the burst counts accumulate. Out of 775
bursts obs... | 1994-08-17 | 2009-10-22 | [
"astro-ph"
] | J.P. Norris (NASA/GSFC), J.T. Bonnell (NASA/USRA), R.J. Nemiroff
(NASA/GMU), J. D. Scargle (NASA/AMES), C. Kouveliotou (NASA/USRA), W.S.
Paciesas (NASA/UAH), C. A. Meegan (NASA/MSFC), G.J. Fishman (NASA/MSFC) |
astro-ph/9408061 | A Merger Model and Globular Cluster Formation | We propose a self-consistent model for globular cluster formation in, but not
limited to, our Galaxy, based on the merger model of Mathews and Schramm
(1993). Stars and star clusters form in bursts at the merging interfaces as
protogalactic clouds collide. We describe the formation of those star clusters
with a simple ... | 1994-08-17 | 2009-10-22 | [
"astro-ph"
] | Sangjin Lee, David N. Schramm and Grant J. Mathews |
astro-ph/9408059 | Stellar Models with Microscopic Diffusion and Rotational Mixing II:
Application to Open Clusters | Stellar models with masses ranging from 0.5 to $1.3~M_\odot$ were constructed
in order to compare to young cluster observations of Li and of rotation
velocities. The amount of Li depletion in cool stars is sensitive to the amount
of overshoot at the base of the surface convection zone, and the exact
metallicity of the ... | 1994-08-17 | 2009-10-22 | [
"astro-ph"
] | Brian Chaboyer, P. Demarque and M.H. Pinsonneault |
astro-ph/9408054 | Hydrodynamics of Coalescing Binary Neutron Stars: Ellipsoidal Treatment | We employ an approximate treatment of dissipative hydrodynamics in three
dimensions to study the coalescence of binary neutron stars driven by the
emission of gravitational waves. The stars are modeled as compressible
ellipsoids obeying a polytropic equation of state; all internal fluid
velocities are assumed to be lin... | 1994-08-17 | 2009-10-22 | [
"astro-ph"
] | Dong Lai and Stu Shapiro |
astro-ph/9408053 | Gravitational Radiation from Rapidly Rotating Nascent Neutron Stars | We study the secular evolution and gravitational wave signature of a
newly-formed, rapidly rotating neutron star. The neutron star may arise from
core collapse in a massive star or from the accretion-induced collapse of a
white dwarf. After a brief dynamical phase, the nascent neutron star settles
into an axisymmetric,... | 1994-08-17 | 2009-10-22 | [
"astro-ph"
] | Dong Lai and Stu Shapiro |
astro-ph/9408058 | Stellar Models with Microscopic Diffusion and Rotational Mixing I:
Application to the Sun | The Yale stellar evolution code has been modified to include the combined
effects of diffusion and rotational mixing on $^1$H, $^4$He and the trace
elements $^3$He, $^6$Li, $^7$Li, and $^9$Be. The interaction between rotational
mixing and diffusion is studied by calculating a number of calibrated solar
models. The rota... | 1994-08-17 | 2009-10-22 | [
"astro-ph"
] | Brian Chaboyer, P. Demarque and M.H. Pinsonneault |
astro-ph/9408055 | Resolving the Question of Time for Semiclassical Gravity | Hamilton-Jacobi theory provides a natural starting point for a covariant
description of the gravitational field. Using a spatial gradient expansion, one
may solve for the phase of the wavefunction by using a line-integral in
superspace. Each contour of integration corresponds to a particular choice of
the time-hypersur... | 1994-08-17 | 2007-05-23 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | D.S. Salopek |
astro-ph/9408062 | The Deuterium Abundance and Nucleocosmochronology | We examine galactic chemical evolution models which reproduce the present-day
and pre-solar values of deuterium starting with a primordial value which is
consistent with a baryon-to-photon ratio of $3 \times 10^{-10}$. We consider
various galactic chemical evolution models to determine the viability of
significant deut... | 1994-08-17 | 2009-10-22 | [
"astro-ph"
] | Sean Thomas Scully and Keith A. Olive |
astro-ph/9408060 | Microlensing Events: End of the Dark Halo? | I obtain an upper limit for the optical depth to microlensing toward Baade's
Window of $3\times 10^{-6}$ by assuming that all of the mass of the Galaxy
interior to the Sun (and not in the bulge) is in a disk. The exponential scale
height of the disk is left as a completely arbitrary function of radius and is
varied to ... | 1994-08-17 | 2007-05-23 | [
"astro-ph"
] | Andrew Gould |
astro-ph/9408056 | Effect of Adiabatic Deceleration on the Focused Transport of Solar
Cosmic Rays | In the framework of focused transport theory, adiabatic deceleration arises
from adiabatic focusing in the solar wind frame and from differential solar
wind convection. An explicit formula is given for the deceleration of
individual particles as a function of the pitch angle. Deceleration and other
first-order effects ... | 1994-08-17 | 2009-10-22 | [
"astro-ph"
] | D. Ruffolo |
astro-ph/9408050 | Steps towards Nonlinear Cluster Inversion Through Gravitational
Distortions. II. Generalization of the Kaiser & Squires Method | The weak distortions of high-redshift galaxies caused by gravitational light
deflection near clusters of galaxies can be used to reconstruct the projected
(two-dimensional) surface mass density of intermediate redshift clusters. This
technique, pioneered by Tyson, Valdes & Wenk, and Kaiser & Squires, is
reconsidered in... | 1994-08-16 | 2007-05-23 | [
"astro-ph"
] | Carolin Seitz, Peter Schneider |
astro-ph/9408052 | A New Method for Finding Clusters of Galaxies at z>1 | At large redshifts, a cluster or group may be too distant for the galaxies
within the cluster to be detected individually. However, the light from these
``undetected'' galaxies still modulates the surface brightness of the
background sky. Clusters can appear as 10"-1.5' sized fluctuations in the
surface brightness of t... | 1994-08-16 | 2007-05-23 | [
"astro-ph"
] | J.J. Dalcanton |
astro-ph/9408051 | Super-Eddington Radiation Transfer in Soft Gamma Repeaters | Bursts from soft gamma repeaters have been shown to be super-Eddington by a
factor of 1000 and have been persuasively associated with compact objects.
Here, a model of super-Eddington radiation transfer on the surface of a
strongly magnetic ($\geq 10^{13}$ gauss) neutron star is studied and related to
the observational... | 1994-08-16 | 2009-10-22 | [
"astro-ph"
] | Andrew Ulmer |
astro-ph/9408044 | Primordial Spectral Indices from Generalized Einstein Theories | Primordial spectral indices are calculated to second order in slow-roll
parameters for three closely-related models of inflation, all of which contain
a scalar field non-minimally coupled to the Ricci curvature scalar. In most
cases, $n_s$ may be written as a function of the non-minimal curvature coupling
strength $\xi... | 1994-08-15 | 2010-11-01 | [
"astro-ph",
"gr-qc",
"hep-ph"
] | David Kaiser |
astro-ph/9408049 | Gross Spectral Differences between Bright and Dim Gamma-Ray Bursts | We find that dim gamma-ray bursts (GRBs) are softer than bright GRBs, as
indicated on average by data from the Burst and Transient Source Experiment
(BATSE) on board the Compton Gamma Ray Observatory. We show that this
correlation is statistically significant with respect to variations due to
random differences between... | 1994-08-15 | 2009-10-22 | [
"astro-ph"
] | R.J. Nemiroff (NASA/GMU), J.P. Norris (NASA/GSFC), J.T. Bonnell
(NASA/USRA), W.A.D.T. Wickramasinghe (UPenn), C. Kouveliotou (NASA/USRA),
W.S. Paciesas (NASA/UAH), G.J. Fishman (NASA/MSFC), C.A. Meegan (NASA/MSFC) |
astro-ph/9408048 | X-ray Variability and Period Determinations in the Eclipsing Polar DP
Leo | An analysis of ROSAT observations for the eclipsing magnetic cataclysmic
binary DP Leo provides constraints on the origin, size, temperature,
variability and structure of the soft X-ray emission region on the surface of
the white dwarf. These data, when combined with prior observations, show a
progression of approximat... | 1994-08-15 | 2009-10-22 | [
"astro-ph"
] | C.R. Robinson and F.A. Cordova |
astro-ph/9408047 | Microlensing Events of the LMC are Better Explained by Stars within the
LMC Than by Machos | The recently reported microlensing events of the LMC have caused much
excitement, and have been interpreted as due to `dark objects' (MACHOs) in the
halo of our Galaxy. It is shown here that the stars within the LMC play a
dominant role as gravitational lenses and can indeed account for the observed
events. The MACHO e... | 1994-08-15 | 2009-10-22 | [
"astro-ph"
] | Kailash C. Sahu |
astro-ph/9408046 | Likelihood Analysis of Large-Scale Flows | We apply a likelihood analysis to the data of \markcite{Lauer \& Postman
1994} With $P(k)$ parametrized by $(\sigma_8, \Gamma)$, the likelihood function
peaks at $\sigma_8\simeq0.3$, $\Gamma\lesssim0.025$, indicating at face value
very strong large-scale power, though at a level incompatible with COBE\@.
There is, howe... | 1994-08-15 | 2009-10-22 | [
"astro-ph"
] | A. Jaffe and N. Kaiser (CITA) |
astro-ph/9408043 | Velocity Bias in MS1224+20 | Velocity bias offers a single parameter ($b_v$) description of the likely
segregation of mass and light in a galaxy cluster. The relation between the
projected mass profile and the light profile, normalized by the virial $M/L$,
is presented as a function of $b_v\equiv\sigma_\ell/\sigma_\rho$, the ratio of
the RMS veloc... | 1994-08-15 | 2009-10-22 | [
"astro-ph"
] | R. G. Carlberg |
astro-ph/9408045 | Bias Minimisation in POTENT | Much current interest in cosmology has revolved around the peculiar velocity
field of galaxies. Many methods have been proposed to derive this, probably the
most prominent being POTENT (Dekel et al. 1990). However, this is prone to many
forms of systematic error or bias. Here, we examine some of the methods
currently u... | 1994-08-15 | 2007-05-23 | [
"astro-ph"
] | A. Newsam, J.F.L. Simmons, M.A. Hendry |
astro-ph/9408042 | Detection of Compact Ultraviolet Nuclear Emission in LINER Galaxies | Low-ionization nuclear emission-line regions (LINERs), which exist in a large
fraction of galaxies, may be the least luminous manifestation of quasar
activity. The nature of LINERs has, however, remained controversial because an
AGN-like nonstellar continuum source has not been directly observed in them. We
report the ... | 1994-08-14 | 2008-11-26 | [
"astro-ph"
] | Dan Maoz, Alexei V. Filippenko, Luis C. Ho, Hans-Walter Rix, John N.
Bahcall, Donald P. Schneider, and F. Duccio Macchetto |
astro-ph/9408041 | Magnetic Merging in Colliding Flux Tubes | We develop an analytical theory of reconnection between colliding, twisted
magnetic flux tubes. Our analysis is restricted to direct collisions between
parallel tubes and is based on the collision dynamics worked out by Bogdan
(1984). We show that there is a range of collision velocities for which neutral
point reconne... | 1994-08-14 | 2009-10-22 | [
"astro-ph"
] | Ellen G. Zweibel & James E. Rhoads |
astro-ph/9408040 | Semi-analytic Continuum Spectra of Type II Supernovae and the Expanding
Photosphere Method of Distance Determination | We extend the approximate radiative transfer analysis of Hershkowitz, Linder,
and Wagoner (1986) to a more general class of supernova model atmospheres,
using a simple fit to the effective continuum opacity produced by lines
(Wagoner, Perez, and Vasu 1991). At the low densities considered, the
populations of the excite... | 1994-08-14 | 2008-02-03 | [
"astro-ph"
] | M.J. Montes & R.V. Wagoner |
astro-ph/9408039 | BD+30 3639: The Infrared Spectrum During Post-AGB Stellar Evolution | We present a radiative-transfer calculation which reproduces the infrared
spectrum of the planetary nebula BD~+30$^{\circ}$3639. We calculate the
transfer process through absorption and scattering in a spherical-symmetric
multi-grain dust shell. The emission of transiently heated particles is taken
into account, as wel... | 1994-08-13 | 2015-06-24 | [
"astro-ph"
] | R. Siebenmorgen, A.A. Zijlstra and E. Kruegel |
astro-ph/9408037 | CMB Maps at 0.5 degree Resolution I: Full-Sky Simulations and Basic
Results | We have simulated full-sky maps of the Cosmic Microwave Background (CMB)
anisotropy expected from Cold Dark Matter (CDM) models at 0.5 and 1.0 degree
angular resolution. Statistical properties of the maps are presented as a
function of sky coverage, angular resolution, and instrument noise, and the
implications of thes... | 1994-08-12 | 2007-05-23 | [
"astro-ph"
] | G. Hinshaw, C.L. Bennett, and A. Kogut |
astro-ph/9408038 | CMB Maps at 0.5 Degree Resolution II: Unresolved Features | High-contrast peaks in the cosmic microwave background (CMB) anisotropy can
appear as unresolved sources to observers. We fit simulated CMB maps generated
with a cold dark matter model to a set of unresolved features at instrumental
resolution 0.5 degrees to 1.5 degrees and present the integral density per
steradian n(... | 1994-08-12 | 2007-05-23 | [
"astro-ph"
] | A. Kogut, G. Hinshaw, and C.L. Bennett |
astro-ph/9408036 | Observations of the Cosmic Microwave Background | The properties of the cosmic microwave background radiation provide unique
constraints on cosmological models, i.e. on the content, history, and evolution
of the Universe. I discuss the latest measurements of the spectral and spatial
properties of the cosmic microwave background radiation. Recent measurements
from NASA... | 1994-08-12 | 2009-10-22 | [
"astro-ph"
] | C. L. Bennett |
astro-ph/9408035 | Current Status of Axion Cosmology | We review the current status of axion cosmology in the light of recent work.
We conclude that in the standard scenario, in which a global string network
forms at the Peccei-Quinn phase transition, the largest contribution to the
axion density is from loops, even when uncertainties in the nature of the QCD
phase transit... | 1994-08-12 | 2007-05-23 | [
"astro-ph",
"hep-ph"
] | R.A. Battye and E.P.S. Shellard |
astro-ph/9408034 | Cosmic Strings and Cosmic Variance | By using a simple analytical model based on counting random multiple impulses
inflicted on photons by a network of cosmic strings we show how to construct
the general q-point temperature correlation function of the Cosmic Microwave
Background radiation. Our analysis is sensible specially for large angular
scales where ... | 1994-08-11 | 2011-05-10 | [
"astro-ph",
"hep-ph"
] | Alejandro Gangui (SISSA-Trieste) and Leandros Perivolaropoulos
(Harvard CfA) |
astro-ph/9408033 | Anticorrelated CN and CH Variations on the 47 Tucanae Main-Sequence
Turnoff | Observations of CN and CH band strengths among a random sample of
main-sequence turn-off stars (+3.9 < MV < +4.6) in the globular cluster 47 Tuc
(NGC 104, C0021-723) were made with the CTIO Argus fiber spectrograph for the
purpose of determining the ratio of CN-strong to CN-weak stars and
investigating the behavior of ... | 1994-08-11 | 2009-10-22 | [
"astro-ph"
] | M. M. Briley, J. E. Hesser, R. A. Bell, M. Bolte and G. H. Smith |
astro-ph/9408030 | Detecting Bimodality in Astronomical Datasets | We discuss statistical techniques for detecting and quantifying bimodality in
astronomical datasets. We concentrate on the KMM algorithm, which estimates the
statistical significance of bimodality in such datasets and objectively
partitions data into sub-populations. By simulating bimodal distributions with
a range of ... | 1994-08-10 | 2009-10-22 | [
"astro-ph"
] | Keith M. Ashman, Christina M. Bird, and Steven E. Zepf |
astro-ph/9408032 | Macho Parallaxes From A Single Satellite | Massive Compact Objects (Machos) are currently being discovered at
substantially higher rates than would be expected from standard models of known
stellar populations. To determine whether they are due to non-standard distri-
butions of known populations or to a heretofore unknown (`dark') population,
one must acquire ... | 1994-08-10 | 2009-10-22 | [
"astro-ph"
] | Andrew Gould |
astro-ph/9408031 | A Survey of Galaxy Redshifts from Low-Resolution Slitless Spectra:
Suggestion of Large-Scale Structures at Z ~0.1 | We have conducted a galaxy survey based on low-resolution slitless spectra
taken from the automated CFHT-Laval survey. We present redshift distributions
for 522 galaxies distributed in 4 distinct regions of the sky. Redshifts are
determined from the shifted positions of the 4000 A. stellar break using an
automated brea... | 1994-08-10 | 2015-06-24 | [
"astro-ph"
] | M. Beauchemin and E.F. Borra |
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