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Maximum gravitational recoil.

Manuela Campanelli1, Carlos O Lousto, Yosef Zlochower

  • 1Center for Computational Relativity and Gravitation, School of Mathematical Sciences, Rochester Institute of Technology, 78 Lomb Memorial Drive, Rochester, New York 14623, USA.

Physical Review Letters
|August 7, 2007
PubMed
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Gravitational recoil from merging black holes can eject binaries from galaxies. This study shows spin orientation significantly impacts recoil velocity, reaching up to 4000 km/s for maximally spinning black holes.

Area of Science:

  • Astrophysics
  • General Relativity
  • Gravitational Waves

Background:

  • Black-hole binary mergers generate gravitational waves.
  • These mergers can impart a recoil velocity to the resulting black hole.
  • Previous studies suggested ejection from galactic nuclei is possible.

Purpose of the Study:

  • To systematically study gravitational recoil in equal-mass black-hole binaries.
  • To investigate the impact of spin orientation on recoil velocity.
  • To determine maximum recoil velocities for specific spin configurations.

Main Methods:

  • Simulated mergers of equal-mass black-hole binaries.
  • Focused on binaries with equal, counteraligned spins parallel to the orbital plane.
  • Analyzed recoil velocity perpendicular to the orbital plane.

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Main Results:

  • Recoil velocity varies sinusoidally with the angle between spin and linear momentum.
  • Maximum recoil velocity reached approximately 4000 km/s for maximally rotating black holes.
  • Recoil velocity is highly sensitive to the pre-merger spin orientations.

Conclusions:

  • Spin orientation is a critical factor in black-hole binary recoil.
  • High recoil velocities are achievable, potentially leading to galactic ejections.
  • Further research on spin-orbit dynamics in mergers is warranted.