Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Panjab UniversityIN1.9k papers
- University of Illinois ChicagoUS1.9k papers
- Purdue University West LafayetteUS1.9k papers
- Centre National de la Recherche ScientifiqueFR1.8k papers
- Florida State UniversityUS1.8k papers
- Fermi National Accelerator LaboratoryUS1.8k papers
- University of RochesterUS1.7k papers
- University of California, RiversideUS1.7k papers
- University of VirginiaUS1.7k papers
- Brown UniversityUS1.7k papers
- Texas A&M UniversityUS1.7k papers
- University of KansasUS1.7k papers
19 papers · 2 filters
Prompt and Delayed High-Energy Emission from Cosmological Gamma-Ray Bursts
M. Boettcher, C. D. Dermer
In the cosmological blast-wave model for gamma ray bursts (GRBs), high energy (> 10 GeV) gamma-rays are produced either through Compton scattering of soft photons by ultrarelativis…
Observations of GX 339-4 in 1996
I. A. Smith, E. P. Liang, D. Lin +9
GX 339-4 is an unusual black hole candidate in that it is a persistent source, being detected by X-ray telescopes most of the time, but it also has nova-like flaring states. In 199…
Multiwavelength Observations of GX 339-4 in 1996. III. Keck Spectroscopy
I. A. Smith, A. V. Filippenko, D. C. Leonard
As part of our multiwavelength campaign of observations of GX 339-4 in 1996 we present our Keck spectroscopy performed on May 12 UT. At this time, neither the ASM on the RXTE nor B…
Multiwavelength Observations of GX 339-4 in 1996. II. Rapid X-ray Variability
I. A. Smith, E. P. Liang
As part of our multiwavelength campaign of GX 339-4 observations in 1996 we present the rapid X-ray variability observed July 26 using the RXTE when the source was in a hard state…
Multiwavelength Observations of GX 339-4 in 1996. I. Daily Light Curves and X-ray and Gamma-Ray Spectroscopy
I. A. Smith, E. P. Liang, D. Lin +6
As part of our multiwavelength campaign of GX 339-4 observations in 1996 we present our radio, X-ray, and gamma-ray observations made in July, when the source was in a hard state (…
A New Approach to Statistics of Cosmological Gamma-Ray Bursts
M. Boettcher, C. D. Dermer
We use a new method of analysis to determine parameters of cosmological gamma-ray bursts (GRBs), assuming that their distribution follows the star-formation history of the universe…
ASCA Discovery of an X-ray Pulsar in the Error Box of SGR1900+14
K. Hurley, P. Li, C. Kouveliotou +9
We present a 2 - 10 keV ASCA observation of the field around the soft gamma repeater SGR1900+14. One quiescent X-ray source was detected in this observation, and it was in the SGR…
A New Model for the Hard Time Lags in Black Hole X-Ray Binaries
M. Boettcher, E. P. Liang
The time-dependent Comptonized output of a cool soft X-ray source drifting inward through an inhomogeneous hot inner disk or corona is numerically simulated. We propose that this s…
Spectral Hardness Decay with Respect to Fluence in BATSE Gamma-Ray Bursts
A. Crider, E. P. Liang, R. D. Preece +5
We have analyzed the evolution of the spectral hardness parameter Epk as a function of fluence in gamma-ray bursts. We fit 41 pulses within 26 bursts with the trend reported by Lia…
Carbon in Spiral Galaxies from Hubble Space Telescope Spectroscopy
D. R. Garnett, G. A. Shields, M. Peimbert +5
We present measurements of the gas-phase C/O abundance ratio in six H II regions in the spiral galaxies M101 and NGC 2403, based on ultraviolet spectroscopy using the Faint Object…
The Discovery and Broad-band Follow-up of the Transient Afterglow of GRB 980703
J. S. Bloom, D. A. Frail, S. R. Kulkarni +14
We report on the discovery of the radio, infrared and optical transient coincident with an X-ray transient proposed to be the afterglow of GRB 980703. At later times when the trans…
Radiation Feedback in Hot Accretion-Disk Corona Models
M. Boettcher, E. P. Liang, I. A. Smith
We present a detailed study of the observable effects of photoionization and Comptonization of line and continuum radiation from a cold accretion disk with a thin, warm, photoioniz…
Analyzing the Multiwavelength Spectrum and Variability of BL Lacertae During the July 1997 Outburst
M. Boettcher, S. D. Bloom
The multiwavelength spectrum of BL Lacertae during its July 1997 outburst is analyzed in terms of different variations of the homogeneous leptonic jet model for the production of h…
On Compton Scattering Scenarios for Blazar Flares
M. Boettcher, C. D. Dermer
The synchrotron reflection scenario recently proposed to explain -ray flares observed from blazar jets is studied. Our analysis takes into account the angular distribution of th…
Fireballs Loading and the Blast Wave Model of Gamma Ray Bursts
C. D. Dermer, J. Chiang, M. Boettcher
A simple function for the spectral power is proposed to model, with 9 parameters, the spectral and temporal evolution of the observed nonthermal synchrotron…
Comptonization signatures in the rapid aperiodic variability of Galactic black-hole candidates
M. Boettcher, E. P. Liang
We investigate the effect of inverse-Compton scattering of flares of soft radiation in different geometries of a hot, Comptonizing region and a colder accretion disk around a solar…
Spectral Properties of a Hybrid Thermal-Nonthermal Isotropic Plasma
D. Lin, E. P. Liang
The spectral properties of a hybrid steady thermal-nonthermal isotropic plasma are studied. The involved emission mechanisms are thermal bremsstrahlung, nonthermal bremsstrahlung,…
Transrelativistic pair plasmas in AGN jets
M. Boettcher, M. Pohl, R. Schlickeiser
Models of relativistic jets filled with ultrarelativistic pair plasma are very successful in explaining the broadband radiation of -ray blazars. Assuming that the initial inject…
High Energy Gamma Rays from Ultrahigh Energy Cosmic Rays in Gamma Ray Bursts
M. Boettcher, C. D. Dermer
It has recently been proposed that ultrahigh energy ( eV) cosmic rays (UHECRs) are accelerated by the blast waves associated with GRBs. We calculate the observed s…