The evolution of the central black hole in an active galactic nucleus. I - Evolution with a constant mass influx

Details The evolution of the central black hole in an active galactic nucleus. I - Evolution with a constant mass influx The evolution of the central black hole in an active galactic nucleus. I - Evolution with a constant mass influx

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..135p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. 135-140.

Astronomy and Astrophysics

Astronomy

27

Active Galactic Nuclei, Black Holes (Astronomy), Quasars, Radio Galaxies, Seyfert Galaxies, Eddington Approximation, Interstellar Magnetic Fields

Scientific paper

The long-term evolution of the central black hole in an active galactic nucleus (AGN), whose rotational energy is being extracted by the Blandford-Znajek process, was analyzed. The model is based on previous axisymmetric, stationary descriptions of the black hole and its magnetosphere, but includes the secular effects of the mass accretion rate. The properties of the black hole and the nonthermal radiation from its environment are calculated under the assumption that the mass influx is constant. It is noted that this model fails to explain the correlation of evolutionary time scale with luminosity or the extremely rapid evolution required for the most luminous sources. It is concluded that the evolution of AGNs is driven by a rapid decrease in mass accretion rate. Since the nature of an AGN is dependent on the ratio mass accretion/total mass, this leads to a conclusion that AGNs evolve from QSOs into the nuclei of Seyfert or radio galaxies.

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