Dynamical and luminosity evolution of active galactic nuclei - Models with a mass spectrum

Details Dynamical and luminosity evolution of active galactic nuclei - Models with a mass spectrum Dynamical and luminosity evolution of active galactic nuclei - Models with a mass spectrum

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370...60m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, March 20, 1991, p. 60-77.

Astronomy and Astrophysics

Astronomy

105

Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Galactic Evolution, Luminosity, Mass Spectra, Fokker-Planck Equation, Red Shift, Stellar Evolution, Stellar Mass Ejection, Stellar Systems

Scientific paper

A multimass energy-space Fokker-Planck code is used to follow the dynamical and luminosity evolution of an AGN model that consists of a dense stellar system surrounding a massive black hole. It is found that stellar evolution and tidal disruption are the predominant mass-loss mechanisms for low-density nuclei, whereas physical collisions dominate in high-density nuclei. For initial central densities greater than 10 million solar masses/cu pc the core of the stellar system contacts due to the removal of kinetic energy by collisions, whereas for densities less than this the core of the stellar system expands due to heating that results from the settling of a small population of stars into orbits tightly bound to the black hole. These mechanisms produce differing power-law slopes in the resulting stellar density cusp surrounding the black hole, -7/4 and -1/2 for low- and high-density nuclei, respectively.

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