We describe the observation of GW170104, a gravitational-wave signal produced by the coalescence of a pair of stellar-mass black holes. The signal was measured on January 4, 2017 at 10 11:58.6 UTC by the twin advanced detectors of the Laser Interferometer Gravitational-Wave Observatory during their second observing run, with a network signal-to-noise ratio of 13 and a false alarm rate less than 1 in 70 000 years. The inferred component black hole masses are 31.2-6.0+8.4M⊙ and 19.4-5.9+5.3M⊙ (at the 90% credible level). The black hole spins are best constrained through measurement of the effective inspiral spin parameter, a mass-weighted combination of the spin components perpendicular to the orbital plane, χeff=-0.12-0.30+0.21. This result implies that spin configurations with both component spins positively aligned with the orbital angular momentum are disfavored. The source luminosity distance is 880-390+450 Mpc corresponding to a redshift of z=0.18-0.07+0.08. We constrain the magnitude of modifications to the gravitational-wave dispersion relation and perform null tests of general relativity. Assuming that gravitons are dispersed in vacuum like massive particles, we bound the graviton mass to mg≤7.7x10-23 eV/c2. In all cases, we find that GW170104 is consistent with general relativity.
B. P. Abbott et al., "GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2," Physical Review Letters, vol. 118, no. 22, American Physical Society (APS), Jun 2017.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.118.221101
Keywords and Phrases
Gravitational effects; Gravity waves; Interferometers; Laser interferometry; Relativity; Signal to noise ratio; Stars; Testing; Advanced detector; General Relativity; Gravitational-wave signals; Laser interferometer gravitational-wave observatories; Massive particles; Orbital angular momentum; Spin configurations; Stellar-mass black holes; Gravitation
International Standard Serial Number (ISSN)
Article - Journal
© 2017 American Physical Society (APS), All rights reserved.
01 Jun 2017