Broadband observations of the black hole transients XTE J1550-564 and GRS 1915+105

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X-Ray Binaries, Black Holes, Gamma-Ray

Scientific paper

Previous work with OSSE has shown that galactic black hole candidates (BHCs) in the X-ray high, soft state have power-law emission above 50 keV that extends at least to energies comparable to the electron rest mass. We report on recent contemporaneous observations of the transients XTE J1550-564 and GRS 1915+105 with ASCA, RXTE, and OSSE. During the OSSE observations of both objects, the emission above 50 keV was slowly declining, covering a range of a factor of three in intensity for the former and a factor of ten for the latter. This is the first time that high-sensitivity observations above 50 keV have been made of these objects over such a wide range in intensity. .

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