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arXiv 2106.09042astro-ph.HEgr-qc
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双黑洞形成通道的偏心观测

Implications of Eccentric Observations on Binary Black Hole Formation Channels

Michael Zevin, Isobel M. Romero-Shaw, Kyle Kremer, Eric Thrane, Paul D. Lasky

摘要:

轨道偏心率是区分动态和孤立的形成方案的二元黑洞合并使用引力波天文台,如LIGO和室女座的最强大的鉴别器之一。使用国家的最先进的集群模型,我们展示了选择效应如何影响集群偏心合并的可检测分布。我们发现,偏心的二进制黑洞合并的观察(或缺乏)可以显着约束的可检测系统的动力学环境,如密集的星团的分数。在大约150次观测之后,如果没有观测到偏心双星信号,就表明星团不可能构成局部宇宙中合并双星黑洞的大部分(95%的可信度)。然而,如果密集的星团占主导地位的偏心合并率和一个单一的系统被证实是可测量的偏心在第一和第二引力波瞬态目录,集群必须占至少14%的可检测的二元黑洞合并。随着偏心观测次数的增加,稠密星团中可探测系统的比例受到的限制会变得更加严格,一旦观测到10个偏心双星黑洞,这一比例将被限制在0.5 dex以内。

英文摘要:

Orbital eccentricity is one of the most robust discriminators for distinguishing between dynamical and isolated formation scenarios of binary black hole mergers using gravitational-wave observatories such as LIGO and Virgo. Using state-of-the-art cluster models, we show how selection effects impact the detectable distribution of eccentric mergers from clusters. We show that the observation (or lack thereof) of eccentric binary black hole mergers can significantly constrain the fraction of detectable systems that originate from dynamical environments, such as dense star clusters. After roughly 150 observations, observing no eccentric binary signals would indicate that clusters cannot make up the majority of the merging binary black hole population in the local universe (95% credibility). However, if dense star clusters dominate the rate of eccentric mergers and a single system is confirmed to be measurably eccentric in the first and second gravitational-wave transient catalogs, clusters must account for at least 14% of detectable binary black hole mergers. The constraints on the fraction of detectable systems from dense star clusters become significantly tighter as the number of eccentric observations grows and will be constrained to within 0.5 dex once 10 eccentric binary black holes are observed.

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