A General Formula for Black Hole Gravitational Wave Kicks

Details A General Formula for Black Hole Gravitational Wave Kicks A General Formula for Black Hole Gravitational Wave Kicks

2010-03-19

arxiv.org/abs/1003.3865v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

14 pages.

Scientific paper

Although the gravitational wave kick velocity in the orbital plane of coalescing black holes has been understood for some time, apparently conflicting formulae have been proposed for the dominant out-of-plane kick, each a good fit to different data sets. This is important to resolve because it is only the out-of-plane kicks that can reach more than 500 km/s and can thus eject merged remnants from galaxies. Using a different ansatz for the out-of-plane kick, we show that we can fit almost all existing data to better than 5 %. This is good enough for any astrophysical calculation, and shows that the previous apparent conflict was only because the two data sets explored different aspects of the kick parameter space.

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