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LIGO, California Institute of Technology, Pasadena, California 91125, USA.
Louisiana State University, Baton Rouge, Louisiana 70803, USA.
Phys Rev Lett. 2017 Jun 2;118(22):221101. doi: 10.1103/PhysRevLett.118.221101. Epub 2017 Jun 1.
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}^{+8.4}M_{⊙} and 19.4_{-5.9}^{+5.3}M_{⊙} (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, χ_{eff}=-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 m_{g}≤7.7×10^{-23} eV/c^{2}. In all cases, we find that GW170104 is consistent with general relativity.
我们描述了对GW170104的观测，这是一个由一对恒星质量黑洞合并产生的引力波信号。该信号于协调世界时2017年1月4日10∶11:58.6被激光干涉引力波天文台的两台先进探测器在其第二次观测运行期间测量到，网络信噪比为13，误报率小于7万年一次。推断的组成黑洞质量为31.2_{-6.0}^{+8.4}太阳质量和19.4_{-5.9}^{+5.3}太阳质量（在90%可信水平）。通过测量有效旋进自旋参数，即垂直于轨道平面的自旋分量的质量加权组合，对黑洞自旋进行了最佳约束，有效自旋参数χ_{eff}=-0.12_{-0.30}^{+0.21}。这一结果意味着两个组成自旋都与轨道角动量正向对齐的自旋构型是不利的。源光度距离为880_{-390}^{+450} 百万秒差距，对应红移z=0.18_{-0.07}^{+0.08}。我们对引力波色散关系的修正幅度进行了约束，并对广义相对论进行了零检验。假设引力子在真空中像有质量的粒子一样色散，我们将引力子质量限制为m_{g}≤7.7×10^{-23} 电子伏特/c^{2}。在所有情况下，我们发现GW170104与广义相对论一致。
