Other
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1294..242t&link_type=abstract
THE FIRST STARS AND GALAXIES: CHALLENGES FOR THE NEXT DECADE. AIP Conference Proceedings, Volume 1294, pp. 242-245 (2010).
Other
Clusters Of Galaxies, Black Holes, Dark Matter, Galactic Centre, Galaxy Clusters, Galactic Nuclei, Circumnuclear Matter, And Bulges, Dark Matter, Galactic Center, Bar, Circumnuclear Matter, And Bulge
Scientific paper
Using highly-accurate N-body simulations, we investigate the evolution of multiple massive black holes (MBHs) in a primordial galaxy that is composed of dark matter, stars, and MBHs. The evolution is pursued as a fully collisional system, where not only three-body interaction of MBHs but also dynamical friction by dark matter and stars are incorporated. The MBHs initially have equal masses. As a result, we find that five MBHs merge successively, emitting gravitational radiation, but the other five do not merge in several tens of crossing times for the galaxy. We find that the key process for the successive merger of MBHs is angular momentum loss due to dynamical friction when they are in the off-central regions of the galaxy. The dynamical friction enhances three-body interactions of MBHs when they come into the central regions of the galaxy. The heaviest MBH loses its angular momentum most effectively, so that a single very massive BH forms in the galactic center. Our simulations show that multiple MBHs can produce a heavier BH in the galactic center purely through N-body processes.
Tanikawa Ataru
Umemura Masayuki
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