[论文解读] GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run

The LIGO Scientific Collaboration, The Virgo Collaboration+1660 more|Open Repository and Bibliography (University of Liège)|Nov 5, 2021

Pulsars and Gravitational Waves Research被引用 61

一句话总结

本文介绍了在第三次观测运行的后半段由 LIGO 和 Virgo 观测到的紧凑型双体合并（compact binary coalescences）的 GWTC-3 目录，详细列出检测结果和源属性。

ABSTRACT

The third Gravitational-Wave Transient Catalog (GWTC-3) describes signals detected with Advanced LIGO and Advanced Virgo up to the end of their third observing run. Updating the previous GWTC-2.1, we present candidate gravitational waves from compact binary coalescences during the second half of the third observing run (O3b) between 1 November 2019, 15:00 UTC and 27 March 2020, 17:00 UTC. There are 35 compact binary coalescence candidates identified by at least one of our search algorithms with a probability of astrophysical origin $p_\mathrm{astro} > 0.5$. Of these, 18 were previously reported as low-latency public alerts, and 17 are reported here for the first time. Based upon estimates for the component masses, our O3b candidates with $p_\mathrm{astro} > 0.5$ are consistent with gravitational-wave signals from binary black holes or neutron star-black hole binaries, and we identify none from binary neutron stars. However, from the gravitational-wave data alone, we are not able to measure matter effects that distinguish whether the binary components are neutron stars or black holes. The range of inferred component masses is similar to that found with previous catalogs, but the O3b candidates include the first confident observations of neutron star-black hole binaries. Including the 35 candidates from O3b in addition to those from GWTC-2.1, GWTC-3 contains 90 candidates found by our analysis with $p_\mathrm{astro} > 0.5$ across the first three observing runs. These observations of compact binary coalescences present an unprecedented view of the properties of black holes and neutron stars.

研究动机与目标

• 呈现第三次观测运行第二阶段的紧凑型双体合并探测目录。
• 表征检测事件的源属性与推断结果。
• 总结探测方法、数据质量与统计考虑。
• 基于更新后的目录提供更新的合并率估计与种群推断。

提出的方法

• 在指定观测期间汇编并审核来自 LIGO 和 Virgo 的观测数据。
• 识别并分类紧凑型双体合并事件。
• 从引力波信号中推断源参数，如质量与自旋。
• 量化不确定性并进行用于速率和分布的种群层面分析。
• 应用统计方法构建一个全面的事件目录。

实验结果

研究问题

• RQ1 在第三次观测运行的第二部分检测到的紧凑型双体合并事件有哪些？
• RQ2 这些事件的推断源属性分布（例如质量、自旋）是什么？
• RQ3 基于 GWTC-3 对合并率密度和种群属性的含义是什么？

主要发现

• 由 LIGO 与 Virgo 在第三次观测运行的第二部分报告的紧凑型双体合并探测目录。
• 检测事件的推断源属性及其不确定性在目录中被汇总。
• 基于 GWTC-3 更新的人群层面的含义，如合并率估计。