Physics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1240..231c&link_type=abstract
HUNTING FOR THE DARK: THE HIDDEN SIDE OF GALAXY FORMATION. Edited by Victor P. Debattista and Cristina C. Popescu AIP Conferen
Physics
Black Holes, Star Formation, Merging, Galaxies, Galactic Nuclei, Circumnuclear Matter, And Bulges, Star Formation, Galaxy Mergers, Collisions, And Tidal Interactions, Origin, Formation, Evolution, Age, And Star Formation
Scientific paper
We investigate numerically the evolution of black hole binaries embedded within geometrically thin gas discs. We find that the binary decays at a rate which is in good agreement with analytical estimates. Scaling our results, we calculate the maximum rate of binary decay that is possible without fragmentation occurring within the surrounding gas disc. We find that decay due to gas discs can be more efficient than that due to stellar scattering for separations below a~0.01-0.1 pc. The minimum merger time scale is shorter than the Hubble time for M<107 Msolar. This implies that gas discs could commonly attend relatively low mass black hole mergers, and that a significant population of binaries might exist at separations of a few hundredths of a pc. For more massive binaries, scattering of stars formed within a fragmenting gas disc could act as a significant additional sink of binary angular momentum.
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