Media type: Text; E-Article Title: GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2 Contributor: Abbott, B.P. [Author]; Abbott, R. [Author]; Abbott, T.D. [Author]; Acernese, F. [Author]; Ackley, K. [Author]; LIGO Scientific Collaboration [Author]; Virgo Collaboration [Author] imprint: College Park, MD : American Physical Society, 2017 Published in: Physical Review Letters 118 (2017), Nr. 22 Issue: published Version Language: English DOI: https://doi.org/10.15488/2101; https://doi.org/10.1103/PhysRevLett.118.221101 ISSN: 0031-9007 Keywords: Gravitational effects ; Stars ; Gravitation ; Interferometers ; Gravitationswelle ; Laser interferometer gravitational-wave observatories ; Signal to noise ratio ; Gravity waves ; Orbital angular momentum ; Stellar-mass black holes ; Spin configurations ; General Relativity ; Gravitational-wave signals ; Testing ; Laser interferometry ; Relativity ; Massive particles ; Advanced detector Origination: Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen. Description: 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≤7.7×10-23 eV/c2. In all cases, we find that GW170104 is consistent with general relativity. © 2017 American Physical Society. Access State: Open Access Rights information: Attribution (CC BY)