Galactic nuclei luminosity - A model of steady spherically-symmetric accretion of optically-thick gas on to Kerr black holes

Astronomy and Astrophysics – Astronomy

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Astronomical Models, Black Holes (Astronomy), Cosmic Gases, Galactic Nuclei, Kerr Magnetooptical Effect, Optical Thickness, Stellar Mass Accretion, Conservation Equations, Continuity Equation, Energy Distribution, Milky Way Galaxy, Relativistic Effects, Seyfert Galaxies, Synchrotron Radiation

Scientific paper

Stationary spherically-symmetric accretion onto Kerr black holes is studied. A theoretical model has been developed in which the relativistic equations of continuity, conservation of four-momentum, local energy balance, and synchrotron radiative transfer have been integrated, by means of a combination of analytical and numerical procedures. Special emphasis has been placed on evaluating the outcoming fluxes, as they can be compared with observations. Calculations were performed for masses of black holes in galactic nuclei, 10 to the 6th solar masses as representative of the hypothetical black hole in the nucleus of the Milky Way and 10 to the 7th solar masses as representative of a moderate Seyfert nucleus. The emergent spectra differ considerably from observations; they are severely modified by dust in more external regions. The total frequency-integrated luminosity is, however, in very good agreement with observations.

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