The black tide model of QSOs. II - Destruction in an isothermal sphere

Details The black tide model of QSOs. II - Destruction in an isothermal sphere The black tide model of QSOs. II - Destruction in an isothermal sphere

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215...36y&link_type=abstract

Astrophysical Journal, Part 1, vol. 215, July 1, 1977, p. 36-52. Research supported by the University of Texas and California I

Astronomy and Astrophysics

Astronomy

39

Astronomical Models, Black Holes (Astronomy), Galactic Nuclei, Globular Clusters, Quasars, Collision Rates, Diffusion, Gravitational Waves, Radiant Flux Density, Seyfert Galaxies, Stellar Motions

Scientific paper

The rate at which a black hole in a galactic nucleus will tidally disrupt stars is calculated using an isothermal sphere to describe the nucleus. The loss-cone theory of stellar diffusion is outlined, diffusion in an isothermal sphere is analyzed along with diffusion in the high-density cusp around the black hole, and loss-cone tidal disruption rates are computed numerically for a black hole in a 'normal' galaxy, a compact E galaxy, a cD galaxy, and a superdense nucleus. It is found that the tidal-disruption model can explain Seyfert nucleus luminosities but not quasar luminosities exceeding about 1 trillion suns, and that collisions, dynamical friction, or other effects in the high-density cusp may well be capable of explaining quasar luminosities. The results are also applied to the case of a black hole in a globular cluster, and it is shown that gravitational diffusion and stellar-collision effects are less important in this case than tidal disruption of stars from loss-cone orbits.

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