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arXiv 1904.07214astro-ph.HEastro-ph.COastro-ph.IMgr-qc
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在Advanced LIGO和Advanced Virgo第二次观测运行中新的二元黑洞合并

New binary black hole mergers in the second observing run of Advanced LIGO and Advanced Virgo

Tejaswi Venumadhav, Barak Zackay, Javier Roulet, Liang Dai, Matias Zaldarriaga

摘要:

我们报告检测新的二元黑洞合并事件的公开数据从先进的LIGO和先进的处女座(O2)的第二次观测运行。合并是使用Venumadhav等人[Phys. Rev. D 100,023011(2019)]中描述的新搜索管道发现的,并且高于Abbott等人(LIGO Scientific和Virgo Collaborations)[Phys. Rev. X 9,031040(2019)]中定义的检测阈值。其中三个合并(GW 170121,GW 170304,GW 170727)推断可能是天体物理起源的$p_{\rm astro} > 0.98$。其余三个(GW 170425、GW 170202、GW 170403)不太确定,$p_{\rm astro}$的范围为0.5至0.8。新发现的合并在很大程度上共享以前报告的事件的统计特性,除了GW 170403,最不安全的事件,它具有高度负的有效自旋参数$χ_{\rm eff}$。最安全的新事件GW 170121($p_{\rm astro} > 0.99$)也值得注意,因为其推断的$χ_{\rm eff}$为负值,这与在~95.8%置信水平下为正值不一致。新的合并几乎是O2报告的引力波事件样本的两倍,并提供了探索宇宙中二元黑洞人口统计的实质性机会。检测到的事件数量并不令人惊讶,因为我们估计我们的管道的检测量可能比其他管道的检测量大两倍(估计中有很大的不确定性)。当网络的组成检测器具有非常不同的灵敏度时,体积的增加更大,就像当前和未来运行中可能出现的情况一样。

英文摘要:

We report the detection of new binary black hole merger events in the publicly available data from the second observing run of advanced LIGO and advanced Virgo (O2). The mergers were discovered using the new search pipeline described in Venumadhav et al. [Phys. Rev. D 100, 023011 (2019)], and are above the detection thresholds as defined in Abbott et al. (LIGO Scientific and Virgo Collaborations) [Phys. Rev. X 9, 031040 (2019).] Three of the mergers (GW170121, GW170304, GW170727) have inferred probabilities of being of astrophysical origin $p_{\rm astro} > 0.98$. The remaining three (GW170425, GW170202, GW170403) are less certain, with $p_{\rm astro}$ ranging from 0.5 to 0.8. The newly found mergers largely share the statistical properties of previously reported events, with the exception of GW170403, the least secure event, which has a highly negative effective spin parameter $χ_{\rm eff}$ . The most secure new event, GW170121 ($p_{\rm astro} > 0.99$), is also notable due to its inferred negative value of $χ_{\rm eff}$, which is inconsistent with being positive at the ~95.8% confidence level. The new mergers nearly double the sample of gravitational wave events reported from O2, and present a substantial opportunity to explore the statistics of the binary black hole population in the Universe. The number of detected events is not surprising since we estimate that the detection volume of our pipeline may be larger than that of other pipelines by as much as a factor of two (with significant uncertainties in the estimate). The increase in volume is larger when the constituent detectors of the network have very different sensitivities, as is likely to be the case in current and future runs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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