APT1 - Astrophysical Black Holes |
Speaker_ |
Case, Gary |
Co-autors |
Evan Anzalone, Gary L. Case, James C. Ling, Robert G. Radocinski, James C. Rodi, Derek Wells, Wm. A. Wheaton |
Talk _ |
Long Term Monitoring of the Hard X-ray/Gamma-Ray Emission from BATSE Black Hole Sources |
Abstract _ |
The CGRO/BATSE instrument viewed numerous sources including GRS 1915+105, GRO J1655-40, GRO J0422+32, GRO J1719-24, and Cygnus X-1 almost continuously from 1991 to 2000 in the energy range 23-1800 keV. Based on analysis of the data taking into account source confusion and additional sources not included in the initial analyses, we present results from the full nine-year earth-occultation database using the JPL Enhanced BATSE Occultation data analysis Package (EBOP). Light curves with 1-day resolution are presented. Time-variable positive fluxes are observed for several sources, including in some cases a hardening of the spectrum during some epochs above ~200 keV. The time evolution of the spectra is presented, and the implications of this hard component for models of the emission from black hole binaries are discussed. |