Consequences of gravitational radiation recoil

Details Consequences of gravitational radiation recoil Consequences of gravitational radiation recoil

2004-02-02

arxiv.org/abs/astro-ph/0402057v2

Astrophys.J.607:L9-L12,2004

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, emulateapj style; minor changes made; accepted to ApJ Letters

Scientific paper

10.1086/421551

Coalescing binary black holes experience an impulsive kick due to anisotropic emission of gravitational waves. We discuss the dynamical consequences of the recoil accompanying massive black hole mergers. Recoil velocities are sufficient to eject most coalescing black holes from dwarf galaxies and globular clusters, which may explain the apparent absence of massive black holes in these systems. Ejection from giant elliptical galaxies would be rare, but coalescing black holes are displaced from the center and fall back on a time scale of order the half-mass crossing time. Displacement of the black holes transfers energy to the stars in the nucleus and can convert a steep density cusp into a core. Radiation recoil calls into question models that grow supermassive black holes from hierarchical mergers of stellar-mass precursors.

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