Black Holes

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Resolving Gas Dynamics in the Circumnuclear Region of a Disk Galaxy in a Cosmological Simulation

December 3, 2007 by Thomas | No comments

  • Levine et al.
  • http://arxiv.org/abs/0711.3478
  • Simulation with high dynamic range (1E7) down to 0.1pc, i.e. to the accretion disk of a SMBH.
  • Global instabilities make things quasi-stable locally due to turbulence.
  • An exponential density profile for the gas in a disk arises naturally due to this.

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Black Hole Growth in Hierarchical Galaxy Formation

November 7, 2007 by Thomas | No comments

  • Malbon et al.
  • http://arxiv.org/abs/astro-ph/0607424
  • Black Hole – bulge mass relation
  • They find that the direct accretion of cold gas during starbursts is an important growth mechanism for lower mass black holes and at high redshift. On the other hand, the re-assembly of pre-existing black hole mass into larger units via merging dominates the growth of more massive black holes at low redshift.
  • As redshift decreases, progressively less massive black holes have the highest fractional growth rates, in line with recent claims of “downsizing” in quasar activity.

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