The evolution of the central black hole in an active galactic nucleus. II - Evolution with an exponentially decreasing mass influx

Details The evolution of the central black hole in an active galactic nucleus. II - Evolution with an exponentially decreasing mass influx The evolution of the central black hole in an active galactic nucleus. II - Evolution with an exponentially decreasing mass influx

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..103p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 10, 1990, p. 103-107.

Astronomy and Astrophysics

Astronomy

8

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Galactic Evolution, Interstellar Magnetic Fields, Luminosity, Radiant Flux Density, Thermal Radiation, Accretion, Black Holes, Galaxies: Nuclei, Radiation Mechanisms

Scientific paper

In the first paper of this series we analyzed the long-term evolution of the nonthermal radiation produced by the central black hole in an active galactic nucleus under the assumption that the mass accretion rate Mṡ+ is constant and that the Blandford-Znajek process is the source of the emission. In this paper we extend that work, but replace the assumption of a constant mass influx, Mṡ+, with
Mṡ+(t) = Mṡ+ (0)e-λτ,
where Mṡ+(0) is the initial mass accretion rate and λ is some positive number. We modify the evolution equations to allow for a time-varying accretion rate and estimate the probable value of λ. Using this value of λ, we get the evolution of the power output from the black hole by the Blandford-Znajek process, the total mass of the black hole, the strength of the magnetic field threading the black hole, a/M of the black hole, and the ratio (mṡ) of Mṡ+ to the Eddington accretion rate. Our results show that many successive short-lived generations of QSOs could been born and die in the period during which the overall population declines, and that there could be ˜ 108 Msun black holes in most bright galaxies.

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