Long Term Monitoring of the Hard X-ray/Gamma Ray Emission from BATSE Black Hole Sources

Details Long Term Monitoring of the Hard X-ray/Gamma Ray Emission from BATSE Black Hole Sources Long Term Monitoring of the Hard X-ray/Gamma Ray Emission from BATSE Black Hole Sources

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0753c&link_type=abstract

American Astronomical Society, HEAD meeting #9, #7.53; Bulletin of the American Astronomical Society, Vol. 38, p.358

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Scientific paper

The CGRO/BATSE instrument viewed numerous black hole 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, including in some cases a hardening of the spectrum during some epochs above 200 keV. Cyg X-1, GRO J0422+32, and GRO J1719-24 follow power law spectra in the low state and transition in the high state to a thermal Comptonized spectrum below 200 keV and a power law above 200 keV. GRS 1915+105 and GRO J1655-40, on the other hand, show power laws in both low and high states with no evidence for a thermal component and with GRS 1915+105 showing a hardening of the spectrum near 300 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.

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