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Supermassive Black Hole Formation Via Gas Accretion in Nuclear Stellar Clusters

Davies, Melvyn B LU ; Miller, M. Coleman and Bellovary, Jillian M. (2011) In Astrophysical Journal Letters 740(2).
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
black hole physics, galaxies: evolution, galaxies: formation, galaxies:, nuclei
in
Astrophysical Journal Letters
volume
740
issue
2
publisher
University of Chicago Press
external identifiers
  • wos:000296752600011
  • scopus:80053973259
ISSN
2041-8213
DOI
10.1088/2041-8205/740/2/L42
language
English
LU publication?
yes
id
db9e9e9a-54a3-4482-967b-ab244a51b32c (old id 2253564)
date added to LUP
2011-12-20 13:15:16
date last changed
2017-10-22 03:27:17
@article{db9e9e9a-54a3-4482-967b-ab244a51b32c,
  abstract     = {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.},
  articleno    = {L42},
  author       = {Davies, Melvyn B and Miller, M. Coleman and Bellovary, Jillian M.},
  issn         = {2041-8213},
  keyword      = {black hole physics,galaxies: evolution,galaxies: formation,galaxies:,nuclei},
  language     = {eng},
  number       = {2},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal Letters},
  title        = {Supermassive Black Hole Formation Via Gas Accretion in Nuclear Stellar Clusters},
  url          = {http://dx.doi.org/10.1088/2041-8205/740/2/L42},
  volume       = {740},
  year         = {2011},
}