Angular momentum of a supermassive black hole in a dense star cluster

Details Angular momentum of a supermassive black hole in a dense star cluster Angular momentum of a supermassive black hole in a dense star cluster

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..209b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 2, p. 209-217.

Astronomy and Astrophysics

Astronomy

16

Angular Momentum, Black Holes (Astronomy), Star Clusters, Accretion Disks, Active Galactic Nuclei, Relativity, Stellar Motions

Scientific paper

We consider the evolution of the angular momentum of a supermassive black hole in the center of a dense star cluster of mass Mc is greater than Mh. Our treatment of this problem is based on general relativity. We take into account the spin-up of the black hole due to disk accretion of the gas component, and the spin-down due to direct capture of stars from the cluster, and find the equilibrium value of the Kerr angular momentum parameter. We calculate the rate of gas supply to the disk due both to tidal disruption of stars by the black hole, and to liberation of gas through non-elastic star-star collisions far from the black hole. We calculate numerically the cross-section of tidal disruption, compare it with the capture cross-section and average both these cross-sections over the cluster. In the range of black hole masses under consideration and in the case of a dense star cluster, the interaction of the black hole with the stars occurs in the regime of the depleted loss cone. It is shown that the black holes surrounded by the most luminous accretion disks should rotate with an angular momentum parameter close to the extremum.

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