Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.7202c&link_type=abstract
American Astronomical Society Meeting 208, #72.02; Bulletin of the American Astronomical Society, Vol. 38, p.150
Astronomy and Astrophysics
Astronomy
Scientific paper
The BATSE instrument aboard the Compton Gamma-Ray Observatory viewed GRS 1915+105 almost continuously from 1991 to 2000 in the energy range 23-1800 keV. GRS 1915+105 is a galactic microquasar and a black hole candidate, and was observed to undergo repeated gamma-ray outbursts. We present results from the full nine-year BATSE earth-occultation database using the JPL data analysis package EBOP (Enhanced BATSE Occultation Package). Light curves in the energy bands 23-98, 98-230, 230-595, and 595-1798 keV with 1-day resolution are presented showing the flux history of this source over the nine years. Time-variable positive fluxes are observed, including a hardening of the spectrum during some epochs above 200 keV, suggesting multiple populations of energetic electrons or acceleration regions. The time evolution of the 23-1798 keV spectra is presented, and the implications of this hard component for models of the emission from black hole binaries are discussed.
Case Gary L. II
Cherry Michael L.
Ling James C.
Rodi James C.
Wheaton Wm. A.
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