GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo during the First Half of the Third Observing Run
GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo during the First Half of the Third Observing Run
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DOI：
10.1103/physrevx.11.021053
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发表时间：
2021-06-09
影响因子：
12.5
通讯作者：
Zweizig, J.
中科院分区：
文献类型：
--
作者：
Abbott, R.;Abbott, T. D.;Zweizig, J.
我们报告了Advanced LIGO和Advanced Virgo在2019年4月1日15：00 UTC至2019年10月1日15：00 UTC之间的第三次观测运行（O3 a）的前半部分检测到的致密二元聚并引力波发现。通过在构成我们搜索的四个搜索管道中的每一个中设置每年两次的误报率阈值，我们提出了39个候选引力波事件。在这个阈值下，我们预计污染分数小于10%。其中，26个候选事件以前通过伽马射线坐标网络通知和通告近实时报告; 13个是首次报告。该目录包含的事件，其来源是黑洞的二进制合并高达约0.8的红移，以及事件的组成部分不能明确确定为黑洞或中子星。对于后一组，我们无法仅根据引力波数据对组分质量和自旋的估计来确定其性质。与GWTC-1相比，被明确识别为二元黑洞的候选事件质量范围（两个对象>= 3 M圆点）增加，总质量从GW 190924_021846的约14 M圆点到GW 190521的约150 M圆点。该目录首次包括具有显著不对称质量比的二元系统，这些系统在2019年4月之前的数据中没有观察到。我们还发现，自2019年4月以来检测到的39个事件中，有11个在我们的默认先验（90%可信度）下具有正的有效内旋自旋，而没有一个表现出负的有效内旋自旋。考虑到Advanced LIGO和Advanced Virgo的灵敏度增加，在大约26周的数据中检测到39个候选事件（大约每周1.5个）与GWTC-1一致。
We report on gravitational-wave discoveries from compact binary coalescences detected by Advanced LIGO and Advanced Virgo in the first half of the third observing run (O3a) between 1 April 2019 15: 00 UTC and 1 October 2019 15: 00 UTC. By imposing a false-alarm-rate threshold of two per year in each of the four search pipelines that constitute our search, we present 39 candidate gravitational-wave events. At this threshold, we expect a contamination fraction of less than 10%. Of these, 26 candidate events were reported previously in near-real time through gamma-ray coordinates network notices and circulars; 13 are reported here for the first time. The catalog contains events whose sources are black hole binary mergers up to a redshift of approximately 0.8, as well as events whose components cannot be unambiguously identified as black holes or neutron stars. For the latter group, we are unable to determine the nature based on estimates of the component masses and spins from gravitational-wave data alone. The range of candidate event masses which are unambiguously identified as binary black holes (both objects >= 3 M-circle dot) is increased compared to GWTC-1, with total masses from approximately 14 M-circle dot for GW190924_021846 to approximately 150 M-circle dot for GW190521. For the first time, this catalog includes binary systems with significantly asymmetric mass ratios, which had not been observed in data taken before April 2019. We also find that 11 of the 39 events detected since April 2019 have positive effective inspiral spins under our default prior (at 90% credibility), while none exhibit negative effective inspiral spin. Given the increased sensitivity of Advanced LIGO and Advanced Virgo, the detection of 39 candidate events in approximately 26 weeks of data (approximately 1.5 per week) is consistent with GWTC-1.