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16 papers · 2 filters
SCUBA sub-millimeter observations of gamma-ray bursters: II. GRB 991208, 991216, 000301C, 000630, 000911, 000926
I. A. Smith, R. P. J. Tilanus, R. A. M. J. Wijers +4
We discuss our ongoing program of Target of Opportunity sub-millimeter observations of gamma-ray bursts (GRBs) using the Sub-millimetre Common-User Bolometer Array (SCUBA) on the J…
Transient Absorption Features in GRBs and Their Implications for GRB Progenitors
M. Boettcher, C. L. Fryer, C. D. Dermer
The recent detection of a transient absorption feature in the prompt emission of GRB 990705 has sparked multiple attempts to fit this feature in terms of photoelectric absorption o…
Dust In I Zw 18 From Hubble Space Telescope Narrow Band Imaging
John M. Cannon, Evan D. Skillman, Donald R. Garnett +1
We present new WFPC2 narrow band imaging of the blue compact dwarf galaxy I Zw 18, which is host to the lowest-metallicity HII regions known. Images at H-alpha and H-beta are combi…
Synchrotron and Synchrotron Self-Compton Spectral Signatures and Blazar Emission Models
James Chiang, Markus Boettcher
We find that energy losses due to synchrotron self-Compton (SSC) emission in blazar jets can produce distinctive signatures in the time-averaged synchrotron and SSC spectra of thes…
Radiation from collision-dominated relativistic pair fireballs
M. Boettcher, R. Schlickeiser, A. Marra
It is generally accepted that gamma-ray bursts (GRBs) are initiated by a relativistic pair fireball, converting its internal energy into kinetic energy of a relativistically moving…
Pair Production and Radiation Effects in Clouds Illuminated by Gamma Ray Sources
C. D. Dermer, M. Boettcher, E. P. Liang
Many classes of gamma-ray sources, such as gamma-ray bursts, blazars, Seyfert galaxies, and galactic black hole sources are surrounded by large amounts of gas and dust. X-rays and…
Identifying the Mysterious EGRET Sources: Signatures of Polar Cap Pulsar Models
Matthew G. Baring
The advent of the next generation of gamma-ray experiments, led by GLAST, AGILE, INTEGRAL and a host of atmospheric Čerenkov telescopes coming on line in the next few years, will e…
An evolutionary scenario for blazar unification
M. Boettcher, C. D. Dermer
Blazar subclasses ranging from flat-spectrum radio quasars (FSRQs) through low-frequency-peaked BL Lac objects (LBLs) to high-frequency-peaked BL Lac objects (HBLs) exhibit a seque…
Physics Input from Multiwavelength Observations of AGN
M. Boettcher
The current status of leptonic jet models for blazars is reviewed. Differences between the quasar and BL-Lac subclasses of blazars may be understood in terms of the dominance of di…
The Anomalous Infrared Emission of Abell 58
Josef Koller, Stefan Kimeswenger
We present a new model to explain the excess in mid and near infrared emission of the central, hydrogen poor dust knot in the planetary nebula (PN) Abell 58. Current models disagre…
Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands
R. C. Hartman, M. Villata, T. J. Balonek +36
Light curves of 3C 279 are presented in optical (R-band), X-rays (RXTE/PCA), and gamma rays (CGRO/EGRET) for 1999 Jan-Feb and 2000 Jan-Mar. During both of those epochs the gamma-ra…
Keck II spectroscopy of mHz quasi-periodic oscillations in Hercules X-1
K O'Brien, Keith Horne, B Boroson +5
We present Keck II spectroscopy of an optical mHz quasi-periodic oscillations (QPOs) in the lightcurve of the X-ray pulsar binary Her X-1. In the power spectrum it appears as `peak…
Modeling the Dust Shell of V4334 Sgr
S. Kimeswenger, J. Koller
The central star V4334 Sgr (Sakurai's Nova) of the planetary nebula PN G010.4+04.4 underwent in 1995-1996 the rare event of a very late helium flash. It is only one of two such eve…
An analytic function fit to Monte-Carlo X- and gamma-ray spectra from Thomson thick thermal/nonthermal hybrid plasmas
M. Boettcher, R. Saxena, A. W. Crider
We suggest a simple fitting formula to represent Comptonized X- and gamma-ray spectra from a hot ( keV), Thomson thick () hybrid thermal/nonthermal…
Multi-Epoch Multiwavelength Spectra and Models for Blazar 3C~279
R. C. Hartman, M. Boettcher
Of the blazars detected by EGRET in GeV gamma rays, 3C 279 is not only the best-observed by EGRET, but also one of the best-monitored at lower frequencies. We have assembled eleven…
Coronal cooling and its signatures in the rapid aperiodic variability of Galactic black-hole candidates
M. Boettcher
The most popular models for the complex phase and time lags in the rapid aperiodic variability of Galactic X-ray binaries are based Comptonization of soft seed photons in a hot cor…