Radiation from spherical accretion onto black holes

Details Radiation from spherical accretion onto black holes Radiation from spherical accretion onto black holes

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....44...59m&link_type=abstract

Astronomy and Astrophysics, vol. 44, no. 1, Nov. 1975, p. 59-68.

Astronomy and Astrophysics

Astronomy

100

Black Holes (Astronomy), Interstellar Radiation, Radiation Sources, X Ray Sources, Gamma Rays, Infrared Astronomy, Lines Of Force, Stellar Evolution

Scientific paper

We present calculations of the radiation properties of black holes accreting in a spherically symmetric manner, both in the case when they are isolated and accreting from the interstellar medium, and when they are in a binary system. Two new effects are included, the heating due to dissipation of turbulent motions and magnetic field line reconnection, and the radiation from cosmic rays captured with the accreted gas. The present results indicate that previous conclusions concerning the detectability of isolated black holes is too pessimistic by at least some orders of magnitude. Also, the efficiency of radiation at high accretion rates, which previously was thought to be very small, is here found to be of the order unity, due to the inclusion of the dissipative heating.

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