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Large Merger Recoils and Spin Flips From Generic Black-Hole Binaries

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arxiv gr-qc/0701164 v3 pith:RIDGKKET submitted 2007-01-29 gr-qc astro-ph

Large Merger Recoils and Spin Flips From Generic Black-Hole Binaries

Manuela Campanelli , Carlos O. Lousto , Yosef Zlochower , David Merritt This is my paper
classification gr-qc astro-ph
keywords spinbinarydirectionholekicklargeorbitalplane
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report the first results from evolutions of a generic black-hole binary, i.e. a binary containing unequal mass black holes with misaligned spins. Our configuration, which has a mass ratio of 2:1, consists of an initially non-spinning hole orbiting a larger, rapidly spinning hole (specific spin a/m = 0.885), with the spin direction oriented -45 degrees with respect to the orbital plane. We track the inspiral and merger for ~2 orbits and find that the remnant receives a substantial kick of 454 km/s, more than twice as large as the maximum kick from non-spinning binaries. The remnant spin direction is flipped by 103 degrees with respect to the initial spin direction of the larger hole. We performed a second run with anti-aligned spins, a/m = +-0.5 lying in the orbital plane that produces a kick of 1830 km/s off the orbital plane. This value scales to nearly 4000 km/s for maximally spinning holes. Such a large recoil velocity opens the possibility that a merged binary can be ejected even from the nucleus of a massive host galaxy.

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Cited by 4 Pith papers

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  1. Formation of rotating supergiants via stellar mergers in dense clusters: Implications for black hole natal spins

    astro-ph.HE 2026-07 conditional novelty 6.0

    Stellar mergers with mass ratio q≳0.3 in young clusters can produce blue-supergiant progenitors that leave black holes with dimensionless spins a≃0.5–0.8, reducing post-merger retention and hierarchical-merger rates.

  2. Surrogate models for precessing binary black hole simulations with unequal masses

    gr-qc 2019-05 unverdicted novelty 6.0

    New surrogate models NRSur7dq4 and RemnantModel accurately predict waveforms and remnant properties for precessing unequal-mass binary black holes up to q=4, outperforming existing models by an order of magnitude.

  3. Recoil kicks from binary black hole mergers in GWTC catalogs: implications for retention and hierarchical mergers

    astro-ph.HE 2026-04 unverdicted novelty 5.0

    Recoil kicks are inferred for GWTC-4 binary black hole events with values up to nearly 1000 km/s for some, yielding retention probabilities of 1-5% in globular clusters and 70-100% in elliptical galaxies.

  4. The first decade of gravitational-wave measurements of black hole spins

    gr-qc 2026-06 unverdicted

    A review summarizing formation-channel predictions, waveform effects, and population-level constraints on stellar-mass black hole spins from the first decade of gravitational-wave observations.