Inhomogeneous spherical accretion onto massive black holes as a model for active galactic nuclei

Details Inhomogeneous spherical accretion onto massive black holes as a model for active galactic nuclei Inhomogeneous spherical accretion onto massive black holes as a model for active galactic nuclei

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..910m&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Nov. 1, 1980, p. 910-914.

Astronomy and Astrophysics

Astronomy

9

Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Stellar Mass Accretion, X Ray Sources, Inhomogeneity, Line Spectra, Luminosity, Quasars, Radiant Heating, Seyfert Galaxies, Spectral Line Width, X Ray Irradiation

Scientific paper

Inhomogeneous spherical accretion onto massive black holes is examined, assuming cool condensations in pressure equilibrium with the tenuous component of the flow. A lower limit of cloud size is computed with the condition that the clouds should survive evaporation in the hot background resulting in thicknesses which agree with the available information on low-energy X-ray cutoffs. The broad line emission region distance is determined on the basis of the observed width of the emission lines; the cloud density in the region is 10 to the 11th M(25)/square of M(8)/cu cm. To explain the ratio between the luminosity emitted in lines and the X-rays, half of the accretion mass must be in the form of clouds and the optical depth of flow should be greater than one; alternatively, the infall velocity must be less than the free-fall velocity.

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