GWTC-2.1: Deep extended catalog of compact binary coalescences observed by LIGO and Virgo during the first half of the third observing run
GWTC-2.1: Deep extended catalog of compact binary coalescences observed by LIGO and Virgo during the first half of the third observing run
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DOI：
10.1103/physrevd.109.022001
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发表时间：
2021-08
影响因子：
5
通讯作者：
The Ligo Scientific Collaboration;T. Abbott;T. Abbott;F. Acernese;K. Ackley;C. Adams;N. Adhikari
中科院分区：
文献类型：
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作者：
The Ligo Scientific Collaboration;T. Abbott;T. Abbott;F. Acernese;K. Ackley;C. Adams;N. Adhikari
第二份引力波瞬变星表报告了高级LIGO和高级处女座探测器在世界协调时2019年4月1日15：00至2019年10月1日15：00之间观测到的39个致密双星合并。我们介绍GWTC-2.1，它报告了在同一时期观察到的候选事件的更深层次的列表。我们分析了这段时间内最终版本的应变数据，改进了校准，更好地减去了已公开发布的多余噪声。我们使用三个匹配过滤器搜索流水线进行候选识别，并估计每个候选事件的天体物理概率。虽然GWTC-2使用的虚警率阈值为每年2，我们在GWTC-2.1中包括了1201名通过虚警率阈值每天2的考生。我们计算了天体物理概率大于0.5的44个高重要性候选者的子集的源属性。在这些候选人中，有36人被报告在GWTC-2。如果这里提出的8个额外的高重要性候选物是天体物理的，那么与GWTC-2相比，被明确识别为双黑洞的事件的质量范围(两个对象都是$\geq 3M_\odt$)会增加，总质量从$\sim 14M_\odt$(GW190924_021846)到$\sim 182 M_\odot$(GW190426_190642)。两个新的候选事件(GW190403_051519和GW190426_190642)的主要分量落在由对不稳定超新星理论预测的质量间隙内。我们还扩展了GWTC-2中报告的具有显著不对称质量比的双星群，增加了两个事件(GW190403_051519和GW190917_114630的质量比分别小于$0.65$和$0.44$，概率分别为$90和114630)，并发现8个新事件中有2个具有有效的激发自旋$CHI_MATHORM{Jeff}>；0$(在$90\$可信度)，而没有一个双星具有相同意义的$\CHI_\MATHORM{Jeff}<；0$。
The second Gravitational-Wave Transient Catalog reported on 39 compact binary coalescences observed by the Advanced LIGO and Advanced Virgo detectors between 1 April 2019 15:00 UTC and 1 October 2019 15:00 UTC. We present GWTC-2.1, which reports on a deeper list of candidate events observed over the same period. We analyze the final version of the strain data over this period with improved calibration and better subtraction of excess noise, which has been publicly released. We employ three matched-filter search pipelines for candidate identification, and estimate the astrophysical probability for each candidate event. While GWTC-2 used a false alarm rate threshold of 2 per year, we include in GWTC-2.1, 1201 candidates that pass a false alarm rate threshold of 2 per day. We calculate the source properties of a subset of 44 high-significance candidates that have an astrophysical probability greater than 0.5. Of these candidates, 36 have been reported in GWTC-2. If the 8 additional high-significance candidates presented here are astrophysical, the mass range of events that are unambiguously identified as binary black holes (both objects $\geq 3M_\odot$) is increased compared to GWTC-2, with total masses from $\sim 14 M_\odot$ for GW190924_021846 to $\sim 182 M_\odot$ for GW190426_190642. The primary components of two new candidate events (GW190403_051519 and GW190426_190642) fall in the mass gap predicted by pair instability supernova theory. We also expand the population of binaries with significantly asymmetric mass ratios reported in GWTC-2 by an additional two events (the mass ratio is less than $0.65$ and $0.44$ at $90\%$ probability for GW190403_051519 and GW190917_114630 respectively), and find that 2 of the 8 new events have effective inspiral spins $\chi_\mathrm{eff}>0$ (at $90\%$ credibility), while no binary is consistent with $\chi_\mathrm{eff}<0$ at the same significance.