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Supermassive Black Hole Formation Via Gas Accretion in Nuclear Stellar Clusters

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Author

Summary, in English

Black holes exceeding a billion solar masses have been detected at redshifts greater than six. The rapid formation of these objects may suggest a massive early seed or a period of growth faster than Eddington. Here we suggest a new mechanism along these lines. We propose that in the process of hierarchical structure assembly, dense star clusters can be contracted on dynamical timescales due to the nearly free-fall inflow of self-gravitating gas with a mass comparable to or larger than that of the clusters. This process increases the velocity dispersion to the point where the few remaining hard binaries can no longer effectively heat the cluster, and the cluster goes into a period of homologous core collapse. The cluster core can then reach a central density high enough for fast mergers of stellar-mass black holes and hence the rapid production of a black hole seed that could be 10(5) M-circle dot or larger.

Publishing year

2011

Language

English

Publication/Series

Astrophysical Journal Letters

Volume

740

Issue

2

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • black hole physics
  • galaxies: evolution
  • galaxies: formation
  • galaxies:
  • nuclei

Status

Published

ISBN/ISSN/Other

  • ISSN: 2041-8213