Black hole binary mergers within gas discs

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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 M. 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.

Idioma originalInglés
Título de la publicación alojadaHunting for the Dark
Subtítulo de la publicación alojadaThe Hidden Side of Galaxy Formation - Proceedings of the International Conference
Número de páginas4
EstadoPublicada - 2010
Publicado de forma externa
EventoInternational Conference "Hunting for the Dark: The Hidden Side of Galaxy Formation" - Qawra, Malta
Duración: 19 oct. 200923 oct. 2009

Serie de la publicación

NombreAIP Conference Proceedings
ISSN (versión impresa)0094-243X
ISSN (versión digital)1551-7616


ConferenciaInternational Conference "Hunting for the Dark: The Hidden Side of Galaxy Formation"


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