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      Anomalies in the gravitational recoil of eccentric black-hole mergers with unequal mass ratios

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          Abstract

          The radiation of linear momentum imparts a recoil (or "kick") to the center of mass of a merging black hole binary system. Recent numerical relativity calculations have shown that eccentricity can lead to an approximate 25% increase in recoil velocities for equal-mass, spinning binaries with spins lying in the orbital plane ("superkick" configurations) [PRD 10 (2020) 024044 (arXiv:1910.01598)]. Here we investigate the impact of nonzero eccentricity on the kick magnitude and gravitational-wave emission of nonspinning, unequal-mass black hole binaries. We confirm that nonzero eccentricities at merger can lead to kicks which are larger by up to ~25% relative to the quasicircular case. We also find that the kick velocity \(v\) has an oscillatory dependence on eccentricity, that we interpret as a consequence of changes in the angle between the infall direction at merger and the apoapsis (or periapsis) direction.

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          Author and article information

          Journal
          26 January 2021
          Article
          2101.11015
          9780f206-4f31-4429-b4cd-d205c74424eb

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          14 pages, 7 figures, to be submitted to Phys.Rev.D
          gr-qc astro-ph.HE

          General relativity & Quantum cosmology,High energy astrophysical phenomena

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