Computer Science
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..391k&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Computer Science
Scientific paper
The process of accretion onto the isolated black holes under the various conditions of the ISM and its observational manifestations are discussed. It is shown that for the majority of the Galaxy volume the accretion rate is as low as 10-6 - 10-9 of Eddington one, and the accretion is spherically-symmetric. Such objects manifest itself as a weak optical and x-ray sources with featureless spectra and the significant variability of the emission. For the BH located inside the dense molecular cloud the regime of accretion depends on its mass. If the mass of the black hole is 10-50 M[sun], the accretion is still spherical due to high velocity, the accretion rate is up to 10-2 of the Eddington one, and the emission has a significant variable hard x-ray and gamma component due to inverse compton scattering. For the massive (100-1000 M[sun ]) BH born in the cloud itself as a result of Population III star collapse the relative velocity may be small, gas velocity gradients significant, so the accretion disk forms, and the object may manifest itself as a ultra-luminous x-ray source (ULX).
Beskin Gregory
Karpov Sergey
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