Limits on Particle Acceleration by Black Holes in X-Ray Binaries

W. Thomas Vestrand

P. Sreekumar

Mark L. McConnell


A large body of theoretical work predicts the production of gamma-ray emission by stellar mass black hole canidates. We report on our effort to detect high-energy gamma-ray emission from a large sample of black hole candidates with the COMPTEL and EGRET telescopes. Our typical limits on gamma-ray luminosity from black hole candiates are L(1-30 MeV) = 1035D2kpc erg/sec and L( > 100 MeV) = 7×1033D2kpc erg/sec. The failure to detect Cygnus X-1, for example, limits the steady-state luminosity above 100 MeV to less than 10-4 of the Eddington luminosity for the system. We discuss the important constraints these observations place on particle acceleration in black hole binary systems.

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On 2 Aug 1999, 16:05.