GW190412: Observation of a binary-black-hole coalescence with asymmetric masses
GW190412: Observation of a binary-black-hole coalescence with asymmetric masses
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DOI：
10.1103/physrevd.102.043015
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发表时间：
2020-08-24
影响因子：
5
通讯作者：
Zweizig, J.
中科院分区：
文献类型：
--
作者：
Abbott, R.;Abbott, T. D.;Zweizig, J.
我们报告在LIGO和Virgo第三次观测运行的前两周观测到双黑洞合并的引力波。该信号于2019年4月12日05:30:44 UTC记录，网络信噪比为19。这个双星与前两次观测的观测结果不同，最明显的是它的质量不对称：一个类似30m圆点黑洞与一个类似8m圆点黑洞的伴星合并。质量更大的黑洞旋转时的无量纲旋转幅度在0.22到0.60之间（90%的概率）。据预测，不对称系统发射的引力波在较高的多极中有更强的贡献，事实上，我们在观测到的信号中发现了强有力的证据，证明引力辐射超出了主要的四极阶。在GW190412上进行的一系列测试表明，它与爱因斯坦的广义相对论一致。虽然这个系统的质量比不同于以前的所有探测，但我们表明它与前两次观测推断的恒星双黑洞的人口模型是一致的。
We report the observation of gravitational waves from a binary-black-hole coalescence during the first two weeks of LIGO's and Virgo's third observing run. The signal was recorded on April 12, 2019 at 05:30:44 UTC with a network signal-to-noise ratio of 19. The binary is different from observations during the first two observing runs most notably due to its asymmetric masses: a similar to 30 M-circle dot black hole merged with a similar to 8 M-circle dot black hole companion. The more massive black hole rotated with a dimensionless spin magnitude between 0.22 and 0.60 (90% probability). Asymmetric systems are predicted to emit gravitational waves with stronger contributions from higher multipoles, and indeed we find strong evidence for gravitational radiation beyond the leading quadrupolar order in the observed signal. A suite of tests performed on GW190412 indicates consistency with Einstein's general theory of relativity. While the mass ratio of this system differs from all previous detections, we show that it is consistent with the population model of stellar binary black holes inferred from the first two observing runs.