New binary black hole mergers in the LIGO-Virgo O3a data
New binary black hole mergers in the LIGO-Virgo O3a data
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DOI：
10.1103/physrevd.106.043009
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发表时间：
2022-01
影响因子：
5
通讯作者：
S. Olsen;T. Venumadhav;Jonathan Mushkin;Javier Roulet;B. Zackay;M. Zaldarriaga
中科院分区：
文献类型：
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作者：
S. Olsen;T. Venumadhav;Jonathan Mushkin;Javier Roulet;B. Zackay;M. Zaldarriaga
我们报告了在先进的LIGO和先进的Virgo的第三次观测运行（O3 a）的上半年公开发布的数据中检测到10个新的双黑洞（BBH）合并。我们使用更新版本的IAS搜索管道来识别候选信号，并编制一个通过天体物理概率显著性阈值大于0.5的信号目录（遵循GWTC-2.1和3-OGC目录）。更新后的IAS流水线对参数空间的较大区域敏感，应用模板先验，该模板先验将不同的搜索量考虑为内部参数的函数，并使用改进的相干检测统计，该统计最佳地组合来自Hanford和利文斯顿检测器的数据。在这10个新事件中，我们观察到有趣的天体物理场景，包括在正负方向上具有自信的大有效自旋参数的源，由于（脉动）对不稳定性而难以在恒星坍缩模型中形成的高质量黑洞，以及弥合中子星和最轻黑洞之间差距的低质量合并。我们推断源参数的上下黑洞质量差距极端和近单位的质量比，和一个可能的中子星星-黑洞合并以及本地化的电磁对应搜索。我们检测到所有的GWTC-2.1 BBH合并与一致的数据在汉福德和利文斯顿，除了三个响亮的事件被否决，这是兼容的假阳性率，我们的否决程序，和三个低于检测阈值。我们还恢复了事件GW190909_114149的重要性，该事件在GWTC-2中首次出现后被降低为亚阈值触发。这相当于我们的管道搜索重合的汉福德-利文斯顿O3 a数据检测到的总共42个BBH合并。
We report the detection of ten new binary black hole (BBH) mergers in the publicly released data from the the first half of the third observing run (O3a) of advanced LIGO and advanced Virgo. We identify candidates using an updated version of the IAS search pipeline and compile a catalog of signals that pass a significance threshold of astrophysical probability greater than 0.5 (following the GWTC-2.1 and 3-OGC catalogs). The updated IAS pipeline is sensitive to a larger region of parameter space, applies a template prior that accounts for different search volume as a function of intrinsic parameters, and uses an improved coherent detection statistic that optimally combines the data from the Hanford and Livingston detectors. Among the ten new events, we observe interesting astrophysical scenarios including sources with confidently large effective spin parameters in both the positive and negative directions, high-mass black holes that are difficult to form in stellar collapse models due to (pulsational) pair instability, and low-mass mergers that bridge the gap between neutron stars and the lightest observed black holes. We infer source parameters in the upper and lower black hole mass gaps with both extreme and near-unity mass ratios, and one of the possible neutron star--black hole mergers is well localized for electromagnetic counterpart searches. We detect all of the GWTC-2.1 BBH mergers with coincident data in Hanford and Livingston except for three loud events that get vetoed, which is compatible with the false-positive rate of our veto procedure, and three that fall below the detection threshold. We also return to significance the event GW190909_114149, which was reduced to a sub-threshold trigger after its initial appearance in GWTC-2. This amounts to a total of 42 BBH mergers detected by our pipeline's search of the coincident Hanford--Livingston O3a data.