Long-term monitoring of the hard X-ray/gamma-ray emission from galactic black holes with batse

G. L. Case, Louisiana State University
E. Anzalone, Louisiana State University
M. L. Cherry, Louisiana State University
J. C. Rodi, Louisiana State University
J. C. Ling, Jet Propulsion Laboratory
R. G. Radocinski, Jet Propulsion Laboratory
D. Wells, Jet Propulsion Laboratory
W. A. Wheaton, Infrared Processing & Analysis Center


The BATSE instrument aboard the Compton Gamma Ray Observatory monitored numerous astronomical sources, including the Galactic black holes Cygnus X-1, GRO J0422+32, GRO J1719-24, GRS 1915+105, and GRO J1655-40, almost continuously from 1991 to 2000 in the energy range 23-1798 keV. We present results for these five black holes from the full nine-year BATSE earth occultation database using the JPL data analysis package EBOP (Enhanced BATSE Occultation Package). Light curves in four broad energy bands with 1-day resolution are presented showing flux histories for each source over the nine years. Spectra during the high flux/outburst states and low flux/quiescent states for these objects are also presented. The differences in the spectra suggest that there may two different classes of Galactic black holes. © 2008 World Scientific Publishing Co. Pte. Ltd.