Maximum gravitational recoil.

@article{Campanelli2007MaximumGR,
  title={Maximum gravitational recoil.},
  author={Manuela Campanelli and Carlos O. Lousto and Yosef Zlochower and David Merritt},
  journal={Physical review letters},
  year={2007},
  volume={98 23},
  pages={
          231102
        }
}
Recent calculations of gravitational radiation recoil generated during black-hole binary mergers have reopened the possibility that a merged binary can be ejected even from the nucleus of a massive host galaxy. Here we report the first systematic study of gravitational recoil of equal-mass binaries with equal, but counteraligned, spins parallel to the orbital plane. Such an orientation of the spins is expected to maximize the recoil. We find that recoil velocity (which is perpendicular to the… 
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Recoil velocities from equal-mass binary-black-hole mergers.
TLDR
Using two independent methods it is shown that the merger of such binaries yields velocities as large as approximately 440 km/s for black holes having unequal spins that are antialigned and parallel to the orbital angular momentum.
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