THE RATE OF BINARY BLACK HOLE MERGERS INFERRED FROM ADVANCED LIGO OBSERVATIONS SURROUNDING GW150914
THE RATE OF BINARY BLACK HOLE MERGERS INFERRED FROM ADVANCED LIGO OBSERVATIONS SURROUNDING GW150914
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DOI：
10.3847/2041-8205/833/1/l1
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
The Ligo Scientific Collaboration;T. Abbott;R. Abbott;T. Abbott;M. Abernathy;F. Acernese;K. Ackley
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文献类型：
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作者：
The Ligo Scientific Collaboration;T. Abbott;R. Abbott;T. Abbott;M. Abernathy;F. Acernese;K. Ackley
2015年9月，在世界协调时09：50：45，在两个高级LIGO探测器上发现了一个瞬时引力波信号GW150914。为了评估这一发现的影响，探测器在信号发出前后39天的时间里保持不变的配置。在与GW150914观测到的探测统计阈值相对应的探测统计阈值下，我们对16天的同时双探测器观测数据的搜索估计有虚警率(FAR)，得到GW150914的p值为。对这一触发器的参数估计后续确定其来源是一个双黑洞(BBH)合并了红移(中位数和90%可信范围)的成分质量。在这里，我们报告了这些观测结果对BBH聚合速率的限制。仅考虑GW150914，假设宇宙中所有的BBH具有与该事件相同的质量和自转，施加每100年1的搜索远阈值，并假设BBH合并率在旋转坐标系中是恒定的，我们推断(旋转坐标系)之间的合并率的可信范围为90%。在考虑到每个触发器的天体物理起源的不确定性的同时，结合所有通过一个低得多的阈值的搜索触发器，我们估计了一个更高的速率，范围从关于BBH质量分布的假设。总而言之，我们对利率的各种估计都落在保守的范围内。
A transient gravitational-wave signal, GW150914, was identified in the twin Advanced LIGO detectors on 2015 September 2015 at 09:50:45 UTC. To assess the implications of this discovery, the detectors remained in operation with unchanged configurations over a period of 39 days around the time of the signal. At the detection statistic threshold corresponding to that observed for GW150914, our search of the 16 days of simultaneous two-detector observational data is estimated to have a false-alarm rate (FAR) of , yielding a p-value for GW150914 of . Parameter estimation follow-up on this trigger identifies its source as a binary black hole (BBH) merger with component masses at redshift (median and 90% credible range). Here, we report on the constraints these observations place on the rate of BBH coalescences. Considering only GW150914, assuming that all BBHs in the universe have the same masses and spins as this event, imposing a search FAR threshold of 1 per 100 years, and assuming that the BBH merger rate is constant in the comoving frame, we infer a 90% credible range of merger rates between (comoving frame). Incorporating all search triggers that pass a much lower threshold while accounting for the uncertainty in the astrophysical origin of each trigger, we estimate a higher rate, ranging from depending on assumptions about the BBH mass distribution. All together, our various rate estimates fall in the conservative range .