Long Term Monitoring Of The Hard X-ray/gamma-ray Emission From Grs 1915+105
Abstract
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.
- Publication:
-
American Astronomical Society Meeting Abstracts #208
- Pub Date:
- June 2006
- Bibcode:
- 2006AAS...208.7202C