How black holes get their kicks: Radiation recoil in binary black hole mergers

Details How black holes get their kicks: Radiation recoil in binary black hole mergers How black holes get their kicks: Radiation recoil in binary black hole mergers

2004-08-25

arxiv.org/abs/astro-ph/0408492v1

Astronomy and Astrophysics

Astrophysics

Contribution to Proceedings of the Conference on "Growing Black Holes" held in Garching, Germany, on June 21-25, 2004, edited

Scientific paper

10.1007/11403913_64

Gravitational waves from the coalescence of binary black holes carry linear momentum, causing center of mass recoil. This ``radiation rocket'' has important implications for systems with escape speeds of order the recoil velocity. We describe new recoil calculations using high precision black hole perturbation theory to estimate the magnitude of the recoil for the slow ``inspiral'' coalescence phase; coupled with a cruder calculation for the final ``plunge'', we estimate the total recoil imparted to a merged black hole. We find that velocities of many tens to a few hundred km/sec can be achieved fairly easily. The recoil probably never exceeds about 500 km/sec.

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