Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-17
Adv.SpaceRes.42:523-532,2008
Astronomy and Astrophysics
Astrophysics
7 pages, 10 figures. To appear in the Proceedings of 36th COSPAR Scientific Assembly, held 16 - 23 July 2006, in Beijing, Chin
Scientific paper
10.1016/j.asr.2007.03.104
General properties of accretion onto isolated stellar mass black holes in the Galaxy are discussed. An analysis of plasma internal energy growth during the infall is performed. Adiabatic heating of collisionless accretion flow due to magnetic adiabatic invariant conservation is 25% more efficient than in the standard non-magnetized gas case. It is shown that magnetic field line reconnections in discrete current sheets lead to significant nonthermal electron component formation, which leads to a formation of a hard (UV, X-ray, up to gamma), highly variable spectral component in addition to the standard synchrotron optical component first derived by Shvartsman generated by thermal electrons in the magnetic field of the accretion flow. Properties of accretion flow emission variability are discussed. Observation results of two single black hole candidates - gravitational lens MACHO-1999-BLG-22 and radio-loud x-ray source with featureless optical spectrum J1942+10 - in optical band with high temporal resolution are presented and interpreted in the framework of the proposed model.
Beskin Gregory
Biryukov Anton
Debur V.
Karpov Sergey
Plokhotnichenko Vladimir
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