Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-16
modified version in 2002 A&A, 388, L25
Astronomy and Astrophysics
Astrophysics
Submitted to A&A letters, Oct 16, 2001
Scientific paper
10.1051/0004-6361:20020567
Galactic binary systems that contain a black hole candidate emit hard X-rays in their low luminosity mode. We show that this emission can be understood as due to the Compton scattering of photons from the companion star and/or the accretion disk by relativistic electrons in a jet. The same electrons are also responsible for the radio emission. Two sources -- XTE J1118+480 and Cygnus X-1 -- are modelled as representatives of black holes with low and high luminosity companion stars respectively. We further show that the ultraluminous compact X-ray sources observed in nearby galaxies have the properties expected of stellar mass black holes with high luminosity companions in which the jet is oriented close to our line of sight.
Aharonian Felix A.
Georganopoulos Markos
Kirk John G.
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