Turbulent spherical accretion onto massive black holes (Mapprox.10/sup 6/--10/sup 9/ M/sub sun/) is considered. Temperatures of the order of 10/sup 9/--10/sup 10/ K are found in the inner zone where the synchrotron frequencies are 10/sup 13/--10/sup 14/ Hz. If the optical depth of the hole atmosphere is tauapprox.1, Comptonization can produce a power-law spectrum of index approx.1 from the synchrotron frequencies up to medium X-rays. If tau> or approx. =1, convection of radiation into the hole becomes important at small radii, reducing the efficiency of emission. The results are briefly compared with the observations.
Turbulent accretion onto massive black holes / Maraschi, L.; Perola, G. C.; Reina, C.; Treves, A.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 230:(1979), pp. 243-248. [10.1086/157080]
Turbulent accretion onto massive black holes
Reina, C.;
1979-01-01
Abstract
Turbulent spherical accretion onto massive black holes (Mapprox.10/sup 6/--10/sup 9/ M/sub sun/) is considered. Temperatures of the order of 10/sup 9/--10/sup 10/ K are found in the inner zone where the synchrotron frequencies are 10/sup 13/--10/sup 14/ Hz. If the optical depth of the hole atmosphere is tauapprox.1, Comptonization can produce a power-law spectrum of index approx.1 from the synchrotron frequencies up to medium X-rays. If tau> or approx. =1, convection of radiation into the hole becomes important at small radii, reducing the efficiency of emission. The results are briefly compared with the observations.| File | Dimensione | Formato | |
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