Showing 2004Show all

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gr-qc2004★ 722 cited

Progress in Lunar Laser Ranging Tests of Relativistic Gravity

James G. Williams, Slava G. Turyshev, Dale H. Boggs

Analyses of laser ranges to the Moon provide increasingly stringent limits on any violation of the Equivalence Principle (EP); they also enable several very accurate tests of relat…

gr-qc2004★ 72 cited

Boundary Conditions for the Einstein Evolution System

Lawrence E. Kidder, Lee Lindblom, Mark A. Scheel +2

New boundary conditions are constructed and tested numerically for a general first-order form of the Einstein evolution system. These conditions prevent constraint violations from…

astro-ph2004

Densification of the International Celestial Reference Frame: Results of EVN Observations

P. Charlot, A. L. Fey, C. S. Jacobs +3

The current realization of the International Celestial Reference Frame (ICRF) comprises a total of 717 extragalactic radio sources distributed over the entire sky. An observing pro…

astro-ph2004★ 19 cited

Gamma-Ray Spectral State Transitions of GRO J1719-24

J. C. Ling, Wm. A. Wheaton

We report BATSE earth-occultation observations of the long-term soft gamma-ray (30 keV - 1.7 MeV) flux and spectral variability of the transient source GRO J1719-24 covering a 1000…

astro-ph2004★ 45 cited

VLBA Polarization Observations of Markarian 421 After a Gamma-Ray High State

B. Glenn Piner, Philip G. Edwards

We present four high dynamic range, dual-circular polarization, Very Long Baseline Array (VLBA) observations at 22 GHz of Markarian 421, taken throughout the year following the sou…

astro-ph2004★ 24 cited

Small-scale anisotropy and intermittency in high and low-latitude solar wind

A. Bigazzi, L. Biferale, S. M. A. Gama +1

We analyze low and high--latitude fast solar wind data from the Ulysses spacecraft from 1992 to 1994 using a a systematic method to analyse the anisotropic content of the magnetic…

gr-qc2004★ 81 cited

Lunar Laser Ranging Science: Gravitational Physics and Lunar Interior and Geodesy

James G. Williams, Slava G. Turyshev, Dale H. Boggs +1

Laser pulses fired at retroreflectors on the Moon provide very accurate ranges. Analysis yields information on Earth, Moon, and orbit. The highly accurate retroreflector positions…

astro-ph2004★ 133 cited

Planets and IR Excesses: Preliminary Results from a Spitzer/MIPS Survey of Solar-Type Stars

C. A. Beichman, G. Bryden, G. H. Rieke +10

As part of a large Spitzer/MIPS GTO program, we have searched for infrared excesses due to debris disks toward 26 FGK field stars known from radial velocity (RV) studies to have on…

astro-ph2004★ 46 cited

STIS ultraviolet/optical spectroscopy of `warm' ultraluminous infrared galaxies

D. Farrah, J. A. Surace, S. Veilleux +2

(Abridged) We present high spatial resolution ultraviolet and optical spectroscopy, obtained using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, of…

astro-ph2004★ 34 cited

Millimeter Wavelength Brightness Fluctuations of the Atmosphere Above the South Pole

R. S. Bussmann, W. L. Holzapfel, C. L. Kuo

We report measurements of the millimeter wavelength brightness fluctuations produced by the atmosphere above the South Pole made with the Arcminute Cosmology Bolometer Array Receiv…

astro-ph2004★ 61 cited

Cosmological Parameter Constraints as Derived from the Wilkinson Microwave Anisotropy Probe Data via Gibbs Sampling and the Blackwell-Rao Estimator

M. Chu, H. K. Eriksen, L. Knox +5

We study the Blackwell-Rao (BR) estimator of the probability distribution of the angular power spectrum, P(C_l|d), by applying it to samples of full-sky no-noise CMB maps generated…

gr-qc2004★ 17 cited

The Pioneer Anomaly: The Data, its Meaning, and a Future Test

Michael Martin Nieto, Slava G. Turyshev, John D. Anderson

The radio-metric Doppler tracking data from the Pioneer 10/11 spacecraft, from between 20-70 AU, yields an unambiguous and independently confirmed anomalous blue shift drift of a_t…

astro-ph2004★ 258 cited

The Truncated Disk of CoKu Tau/4

Paola D'Alessio, Lee Hartmann, Nuria Calvet +11

We present a model of a dusty disk with an inner hole which accounts for the Spitzer Space Telescope Infrared Spectrograph observations of the low-mass pre-main sequence star CoKu…

astro-ph2004★ 366 cited

The On-Orbit Performance of the Galaxy Evolution Explorer

P. Morrissey, D. Schiminovich, T. A. Barlow +35

We report the first year on-orbit performance results for the Galaxy Evolution Explorer (GALEX), a NASA Small Explorer that is performing a survey of the sky in two ultraviolet ban…

astro-ph2004★ 2.5k cited

The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission

D. Christopher Martin, James Fanson, David Schiminovich +21

We give an overview of the Galaxy Evolution Explorer (GALEX), a NASA Explorer Mission launched on April 28, 2003. GALEX is performing the first space UV sky-survey, including imagi…

astro-ph2004★ 168 cited

The DEEP Groth Strip Galaxy Redshift Survey. III. Redshift Catalog and Properties of Galaxies

Benjamin J. Weiner, Andrew C. Phillips, S. M. Faber +16

The Deep Extragalactic Evolutionary Probe (DEEP) is a series of spectroscopic surveys of faint galaxies, targeted at the properties and clustering of galaxies at redshifts z ~ 1. W…

gr-qc2004★ 19 cited

Mathematical Structure of Tetrad Equations for Vacuum Relativity

Frank B. Estabrook

The tetrad partial differential equations formulated by Buchman and Bardeen for vacuum gravity are shown to be well posed by calculation of the Cartan characters of an associated e…

astro-ph2004★ 56 cited

The CMB temperature power spectrum from an improved analysis of the Archeops data

M. Tristram, G. Patanchon, J. F. Macias-Perez +47

We present improved results on the measurement of the angular power spectrum of the Cosmic Microwave Background (CMB) temperature anisotropies using the data from the last Archeops…

gr-qc2004★ 54 cited

TDIR: Time-Delay Interferometric Ranging for Space-Borne Gravitational-Wave Detectors

Massimo Tinto, Michele Vallisneri, J. W. Armstrong

Space-borne interferometric gravitational-wave detectors, sensitive in the low-frequency (mHz) band, will fly in the next decade. In these detectors, the spacecraft-to-spacecraft l…

astro-ph2004★ 63 cited

The Lens Redshift and Group Environment for HE 0435-1223

Nicholas D. Morgan, Christopher S. Kochanek, Olga Pevunova +1

The redshift of the galaxy lensing HE 0435-1223 is 0.4546 +/- 0.0002, based on observations obtained with the Low Dispersion Survey Spectrograph 2 (LDSS2) on the Magellan Consortiu…

astro-ph2004★ 936 cited

Mid-Infrared Selection of Active Galaxies

Daniel Stern, Peter Eisenhardt, Varoujan Gorjian +12

Mid-infrared photometry provides a robust technique for identifying active galaxies. While the ultraviolet to mid-infrared continuum of normal galaxies is dominated by the composit…

gr-qc2004★ 33 cited

Experimental Design for the LATOR Mission

Slava G. Turyshev, Michael Shao, Kenneth L. Nordtvedt

This paper discusses experimental design for the Laser Astrometric Test Of Relativity (LATOR) mission. LATOR is designed to reach unprecedented accuracy of 1 part in 10^8 in measur…

astro-ph2004★ 18 cited

X-ray Reflection from Inhomogeneous Accretion Disks: II. Emission Line Variability and Implications for Reverberation Mapping

D. R. Ballantyne, N. J. Turner, A. J. Young

One of the principal scientific objectives of the upcoming Constellation-X mission is to attempt to map the inner regions of accretion disks around black holes in Seyfert galaxies…

hep-ph2004★ 20 cited

Neutrino mass constraints on beta decay

Takeyasu M. Ito, Gary Prezeau

Using the general connection between the upper limit on the neutrino mass and the upper limits on certain types of non-Standard Model interaction that can generate loop corrections…