Comptonization effects in spherical accretion onto black holes

Details Comptonization effects in spherical accretion onto black holes Comptonization effects in spherical accretion onto black holes

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267..371i&link_type=abstract

Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 371-383.

Astronomy and Astrophysics

Astronomy

31

Accretion Disks, Astronomical Models, Black Holes (Astronomy), Compton Effect, Galactic Nuclei, Luminosity, Active Galactic Nuclei, Eddington Approximation, Mass To Light Ratios, Plasma Heating, Radiation Spectra, Synchrotron Radiation, X Ray Sources

Scientific paper

For spherical accretion of gas onto a black hole, dissipative heating leads at high accretion rates to densities and temperatures at which Comptonization unavoidably plays an important role, both in determining gas temperature and in forming the emergent spectrum. A careful and reliable treatment of the interaction of the gas with the radiation field is greatly complicated by the necessity of dealing with the essentially nonlocal nature of Comptonization. Approximate descriptions are presented of some observational features of such astrophysical objects with a simple, yet justifiable, Ansatz that evades the complexities of nonlocality. The results for accretion spectra are of interest, e.g., in connection with galactic halo objects. High mass cases are of interest as models for active galactic nuclei. In particular, a very natural connection between the ratio of luminosity to Eddington luminosity and the hardness of X-ray spectra emerges, suggesting that the observed X-ray hardness ratios of luminous sources are a consequence of those sources being more or less Eddington limited.

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