GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence

Abstract : We report the observation of a gravitational-wave signal produced by the coalescence of two stellar-mass black holes. The signal, GW151226, was observed by the twin detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) on December 26, 2015 at 03:38:53 UTC. The signal was initially identified within 70 s by an online matched-filter search targeting binary coalescences. Subsequent off-line analyses recovered GW151226 with a network signal-to-noise ratio of 13 and a significance greater than 5 σ. The signal persisted in the LIGO frequency band for approximately 1 s, increasing in frequency and amplitude over about 55 cycles from 35 to 450 Hz, and reached a peak gravitational strain of 3.4+0.7−0.9×10−22. The inferred source-frame initial black hole masses are 14.2+8.3−3.7M⊙ and 7.5+2.3−2.3M⊙ and the final black hole mass is 20.8+6.1−1.7M⊙. We find that at least one of the component black holes has spin greater than 0.2. This source is located at a luminosity distance of 440+180−190 Mpc corresponding to a redshift 0.09+0.03−0.04. All uncertainties define a 90 % credible interval. This second gravitational-wave observation provides improved constraints on stellar populations and on deviations from general relativity.
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Physical Review Letters, American Physical Society, 2016, 116, pp.241103. 〈10.1103/PhysRevLett.116.241103〉
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http://hal.in2p3.fr/in2p3-01332514
Contributeur : Claudine Bombar <>
Soumis le : jeudi 16 juin 2016 - 09:53:17
Dernière modification le : mardi 16 janvier 2018 - 16:00:21

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B.P. Abbott, T. Adams, R. Bonnand, D. Buskulic, M. Ducrot, et al.. GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence. Physical Review Letters, American Physical Society, 2016, 116, pp.241103. 〈10.1103/PhysRevLett.116.241103〉. 〈in2p3-01332514〉

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