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GW190412: observation of a binary-black-hole coalescence with asymmetric masses

Abbott, R, Abbott, TD and Siellez, K 2020 , 'GW190412: observation of a binary-black-hole coalescence with asymmetric masses' , Physical Review D, vol. 102, no. 4 , doi:

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We report the observation of gravitational waves from a binary-black-hole coalescence during the first two weeks of LIGOs and Virgos third observing run. The signal was recorded on April 12, 2019 at 05∶30∶44 UTC with a network signal-to-noise ratio of 19. The binary is different from observations during the first two observing runs most notably due to its asymmetric masses: a ∼30 M⊙ black hole merged with a ∼8 M⊙ black hole companion. The more massive black hole rotated with a dimensionless spin magnitude between 0.22 and 0.60 (90% probability). Asymmetric systems are predicted to emit gravitational waves with stronger contributions from higher multipoles, and indeed we find strong evidence for gravitational radiation beyond the leading quadrupolar order in the observed signal. A suite of tests performed on GW190412 indicates consistency with Einsteins general theory of relativity. While the mass ratio of this system differs from all previous detections, we show that it is consistent with the population model of stellar binary black holes inferred from the first two observing runs.

Item Type: Article
Authors/Creators:Abbott, R and Abbott, TD and Siellez, K
Keywords: gravitational wave detection, gravitational wave sources, gravitational waves, astronomical black holes
Journal or Publication Title: Physical Review D
Publisher: American Physical Society
ISSN: 2470-0010
DOI / ID Number:
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© 2022 American Physical Society. All rights reserved. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. (

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