Alignment of the Spins of Supermassive Black Holes Prior to Merger

Details Alignment of the Spins of Supermassive Black Holes Prior to Merger Alignment of the Spins of Supermassive Black Holes Prior to Merger

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21012117r&link_type=abstract

American Astronomical Society Meeting 210, #121.17; Bulletin of the American Astronomical Society, Vol. 39, p.330

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Scientific paper

Fully relativistic simulations of merging spinning black holes suggest that the emission of gravitational waves can impart a kick of several thousand kilometers per second on the merger remnant if the spin axes of pre-merger black holes lie close to the plane of the orbit. This exceeds galactic escape speeds and would suggest that some fraction of major galaxy mergers would lead to complete ejection of the final black hole. We suggest that, in most gas-rich galactic mergers, accretion torques will effectively align the black hole spins with the orbital angular momentum of the binary thereby allowing these large kick velocities to be avoided. We predict, however, that alignment will not occur in gas-free mergers and that the merger remnant will indeed be ejected in some small fraction of major gas-free mergers. We also discuss other predictions of our scenario including implications for X-shaped radio galaxies.

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