Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of California, BerkeleyUS1.3k papers
- Goddard Space Flight CenterUS1.3k papers
- California Institute of TechnologyUS1.3k papers
- The Ohio State UniversityUS1.2k papers
- Centre National de la Recherche ScientifiqueFR1.1k papers
- Massachusetts Institute of TechnologyUS1.1k papers
- University of Maryland, College ParkUS1k papers
- Center for Astrophysics Harvard & SmithsonianUS975 papers
- Lawrence Berkeley National LaboratoryUS897 papers
- University of ChicagoUS889 papers
- University of WashingtonUS868 papers
- Yale UniversityUS848 papers
52 papers · 2 filters
The Energy Spectra and Relative Abundances of Electrons and Positrons in the Galactic Cosmic Radiation
S. W. Barwick, J. J. Beatty, C. R. Bower +17
Observations of cosmic-ray electrons and positrons have been made with a new balloon-borne detector, HEAT (the "High-Energy Antimatter Telescope"), first flown in 1994 May from For…
Measurement of Relativistic Orbital Decay in the PSR B1534+12 Binary System
I. H. Stairs, Z. Arzoumanian, F. Camilo +5
We have made timing observations of binary pulsar PSR B1534+12 with radio telescopes at Arecibo, Green Bank, and Jodrell Bank. By combining our new observations with data collected…
A Search for Line Shape and Depth Variations in 51 Pegasi and Tau Bootis
T. M. Brown, R. Kotak, S. D. Horner +4
Spectroscopic observations of 51 Pegasi and tau Bootis show no periodic changes in the shapes of their line profiles; these results for 51 Peg are in significant conflict with thos…
Refreshed Shocks and Afterglow Longevity in GRB
M. J. Rees, P. Meszaros
We consider fireball models where the ejecta have a range of bulk Lorentz factors, so that the inner (lower ) parts may carry most of the mass, or even most of the energy. The o…
1H0419-577: a two-state Seyfert Galaxy?
M. Guainazzi, A. Comastri, G. Stirpe +3
The preliminary results of the BeppoSAX observation of the radio-quiet AGN 1H0419-577 are presented. Despite its broad line optical spectrum, the intermediate X-ray spectrum (i.e.…
The Kinematic Composition of MgII Absorbers
Jane C. Charlton, Christopher W. Churchill
The study of galaxy evolution using quasar absorption lines requires an understanding of what components of galaxies and their surroundings are contributing to the absorption in va…
Orbital Parameters for the Soft X-ray Transient 4U 1543-47: Evidence for a Black Hole
Jerome A. Orosz, Raj K. Jain, Charles D. Bailyn +2
(shortened) Spectroscopic observations of the soft X-ray transient 4U 1543-47 reveal a radial velocity curve with a period of P=1.123 +/- 0.008 days and a semi-amplitude of K_2 = 1…
Theoretical Models of Gamma-Ray Bursts
P. Meszaros
Models of gamma ray bursts are reviewed in the light of recent observations of afterglows which point towards a cosmological origin. The physics of fireball shock models is discuss…
Radio-loud Active Galaxies in the Northern ROSAT All-Sky Survey III: New Spectroscopic Identifications from the RGB BL Lac Survey
S. A. Laurent-Muehleisen, R. I. Kollgaard, R. B. Ciardullo +3
We present new spectroscopic identifications for 169 objects in the RASS-Green Bank (RGB) catalog of radio- and X-ray-emitting AGN. These data significantly increase the fraction o…
Multiwavelength Observations of a Dramatic High Energy Flare in the Blazar 3C 279
A. E. Wehrle, E. Pian, C. M. Urry +3
The blazar 3C 279, one of the brightest identified extragalactic objects in the gamma-ray sky, underwent a flare of a factor 10 amplitude in gamma-rays towards the end of a 3-week…
Intracluster Stars and the Galactic Halos of Virgo
John J. Feldmeier, Robin Ciardullo, Roger Bartlett +1
Planetary nebulae can be useful dynamical probes of elliptical galaxy halos, but progress thus far has been hampered by the small data samples available for study. In order to obta…
Kinematics and Cloud to Cloud Abundance Ratios: A Rosetta Stone for Disk and Halo Components in Mg II Absorbers
Christopher W. Churchill, Jane C. Charlton
Based upon QSO absorption line studies, galaxies at 0.3 < z < 1.0 are seen to have extended gaseous "halos". When the absorption lines are observed at high resolution, the velocity…
Variable Extended Objects in SA 57
Matthew A. Bershady, Dario Trevese, Richard G. Kron
We have isolated a sample of 14 candidate variable objects with extended image structure to Bj = 22.5 in 0.284 deg^2 of Selected Area 57. The majority of candidates are blue (U-B<0…
Radiative Regimes in Gamma-Ray Bursts and Afterglows
A. Panaitescu, P. Meszaros
We present numerical simulations of Gamma-Ray Bursts arising from external shocks in the impulsive and wind models, including a weak or a strong coupling between electrons and prot…
High-Speed Optical Spectroscopy of a Cataclysmic Variable Wind: BZ Camelopardalis
F. A. Ringwald, T. Naylor
BZ Cam is the first cataclysmic variable star with an accretion disk wind evident in its optical spectrum. The wind was found by Thorstensen, who discovered intermittent P Cygni pr…
Rings in Fireball Afterglows
A. Panaitescu, P. Meszaros
We derive the equation for the surface of equal arrival times of radiation from a thin relativistic shell interacting with an external medium, representing the afterglow of a gamma…
Effects of Galaxy Selection Upon Lyman Alpha Absorber Identification
Suzanne M. Linder
While it is possible to explain Lyman alpha absorber counts at low redshift using gas which is associated with moderately extended galaxies (Linder 1997), absorbers are often obser…
Comparing Galaxies and Lyman Alpha Absorbers at Low Redshift
Suzanne M. Linder
A scenario is explored in which Lyman alpha absorbers at low redshift arise from lines of sight through extended galaxy disks, including those of dwarf and low surface brightness g…
The Neutron Star in the Supernova Remnant PKS 1209-52
V. E. Zavlin, G. G. Pavlov, J. Truemper
We re-analyzed soft X-ray data collected with the ROSAT and ASCA observatories on a candidate neutron star (NS) near the center of the supernova remnant PKS 1209-52. We fitted the…
Mass-to-Radius Ratio for the Millisecond Pulsar J0437-4715
G. G. Pavlov, V. E. Zavlin
Properties of X-ray radiation emitted from the polar caps of a radio pulsar depend not only on the cap temperature, size, and position, but also on the surface chemical composition…
Cosmic Structure of Magnetic Fields
Peter L. Biermann, Hyesung Kang, Joerg P. Rachen +1
The simulations of the formation of cosmological structure allows to determine the spatial inhomogeneity of cosmic magnetic fields. Such simulations, however, do not give an absolu…
The Luminosity Function for L>L* Galaxies at z > 3
Matthew A. Bershady, Steven R. Majewski, David C. Koo +2
Through use of multiband (U, B, R, I) photometry we have isolated high redshift (3.0<z<3.5) galaxy candidates in a survey of 1.27 deg^2 to R = 21.25 and a survey of 0.02 deg^2 to R…
The ROSAT Deep Survey II. Optical identification, photomettry and spectra of sources in the Lockman field
Maarten Schmidt, Guenther Hasinger, James Gunn +7
The ROSAT Deep Survey includes a complete sample of 50 X-ray sources with fluxes in the keV band larger than 5.5 erg cm s in the Lockman field (H…
Viewing Angle and Environment Effects in GRB: Sources of Afterglow Diversity
P. Meszaros, M. J. Rees, R. A. M. J. Wijers
We discuss the afterglows from the evolution of both spherical and anisotropic fireballs decelerating in an inhomogeneous external medium. We consider both the radiative and adiaba…