Recoil Velocities from Equal-Mass Binary-Black-Hole Mergers

Details Recoil Velocities from Equal-Mass Binary-Black-Hole Mergers Recoil Velocities from Equal-Mass Binary-Black-Hole Mergers

2007-01-29

arxiv.org/abs/gr-qc/0701163v2

Phys.Rev.Lett.99:041102,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 3 color eps figures

Scientific paper

10.1103/PhysRevLett.99.041102

The final evolution of a binary black-hole system gives rise to a recoil velocity if an asymmetry is present in the emitted gravitational radiation. Measurements of this effect for non-spinning binaries with unequal masses have pointed out that kick velocities $\sim~175$ km/s can be reached for a mass ratio $\simeq 0.36$. However, a larger recoil can be obtained for equal-mass binaries if the asymmetry is provided by the spins. Using two independent methods we show that the merger of such binaries yields velocities as large as $\sim 440$ km/s for black holes having unequal spins that are antialigned and parallel to the orbital angular momentum.

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