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


Abbott, R and Abbott, TD and Siellez, K and The LIGO Scientific Collaboration and the Virgo Collaboration, GW190412: observation of a binary-black-hole coalescence with asymmetric masses, Physical Review D, 102, (4) Article 043015. ISSN 2470-0010 (2020) [Refereed Article]

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DOI: doi:10.1103/PhysRevD.102.043015


We report the observation of gravitational waves from a binary-black-hole coalescence during the first two weeks of LIGOís and Virgoís 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 Einsteinís 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 Details

Item Type:Refereed Article
Keywords:gravitational wave detection, gravitational wave sources, gravitational waves, astronomical black holes
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:General relativity and gravitational waves
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Siellez, K (Dr Karelle Siellez)
ID Code:150373
Year Published:2020
Web of Science® Times Cited:176
Deposited By:Physics
Deposited On:2022-06-10
Last Modified:2022-06-10

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