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Ossokine S, Scheel M, Szilagyi B, Teukolsky S
LIGO, California Institute of Technology, Pasadena, California 91125, USA.
Louisiana State University, Baton Rouge, Louisiana 70803, USA.
Phys Rev Lett. 2016 Jun 17;116(24):241103. doi: 10.1103/PhysRevLett.116.241103. Epub 2016 Jun 15.
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 5σ. 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_{-0.9}^{+0.7}×10^{-22}. The inferred source-frame initial black hole masses are 14.2_{-3.7}^{+8.3}M_{⊙} and 7.5_{-2.3}^{+2.3}M_{⊙}, and the final black hole mass is 20.8_{-1.7}^{+6.1}M_{⊙}. 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_{-190}^{+180} Mpc corresponding to a redshift of 0.09_{-0.04}^{+0.03}. All uncertainties define a 90% credible interval. This second gravitational-wave observation provides improved constraints on stellar populations and on deviations from general relativity.
我们报告了对由两个恒星质量黑洞合并产生的引力波信号的观测结果。该信号GW151226于协调世界时2015年12月26日03:38:53被激光干涉引力波天文台（LIGO）的两台探测器观测到。该信号最初在70秒内通过针对双黑洞合并的在线匹配滤波搜索被识别出来。随后的离线分析以13的网络信噪比和大于5σ的显著性恢复了GW151226。该信号在LIGO频段持续了约1秒，在约55个周期内从35赫兹到450赫兹频率和振幅不断增加，达到了3.4_{-0.9}^{+0.7}×10^{-22}的峰值引力应变。推断的源参考系初始黑洞质量分别为14.2_{-3.7}^{+8.3}太阳质量和7.5_{-2.3}^{+2.3}太阳质量，最终黑洞质量为20.8_{-1.7}^{+6.1}太阳质量。我们发现至少有一个组成黑洞的自旋大于0.2。该源位于光度距离为44
