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arXiv 2209.02206astro-ph.HEgr-qc
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使用引力波暂现源目录3研究旋转黑洞的群体性质

The population properties of spinning black holes using Gravitational-wave Transient Catalog 3

Hui Tong, Shanika Galaudage, Eric Thrane

AI总结:

本研究利用LVK第三个引力波暂现源目录分析双黑洞自旋性质,发现数据不足以确认零自旋子群存在,但微弱支持极端自旋倾角>90°的并合,并指出至少部分双星在场中形成,动态组装比例至多89%。

摘要:

通过不同途径形成的双黑洞被预测具有不同的自旋性质。利用引力波测量这些性质为揭示双黑洞的起源提供了机会。近期的研究对LIGO--Virgo--KAGRA (LVK)观测到的自旋分布得出了相互矛盾的结论。一些分析表明,部分观测到的黑洞自旋向量相对于轨道角动量存在显著错位(>90°)。这被解释为LVK数据集中的部分双星是在致密恒星环境中动态组装的。其他分析则发现有证据支持存在一个自旋可忽略不计的双星子群,且没有显著错位自旋的证据——这一结果与场形成情景一致。在本研究中,我们研究了第三个LVK引力波暂现源目录中双黑洞的自旋性质。我们发现现有数据不足以分辨是否存在自旋可忽略不计的双星子群(该子群的存在仅由1.7的微弱贝叶斯因子支持)。我们发现对于极端自旋倾角>90°的并合存在微弱支持(极端倾角双星的存在由10.1的贝叶斯因子所支持)。唯一明确的是:至少部分LVK双星是在场中形成的。最多有89%的双星是动态组装的(99%可信度),尽管真实的分支比例可能低得多,甚至可以忽略不计。

英文摘要:

Binary black holes formed via different pathways are predicted to have distinct spin properties. Measuring these properties with gravitational waves provides an opportunity to unveil the origins of binary black holes. Recent work draws conflicting conclusions regarding the spin distribution observed by LIGO--Virgo--KAGRA (LVK). Some analyses suggest that a fraction of the observed black-hole spin vectors are significantly misaligned (by $>90^\circ$) relative to the orbital angular momentum. This has been interpreted to mean that some binaries in the LVK dataset are assembled dynamically in dense stellar environments. Other analyses find support for a sub-population of binaries with negligible spin and no evidence for significantly misaligned spin -- a result consistent with the field formation scenario. In this work, we study the spin properties of binary black holes in the third LVK gravitational-wave transient catalog. We find that there is insufficient data to resolve the existence of a sub-population of binaries with negligible black-hole spin (the presence of this sub-population is supported by a modest Bayes factor of 1.7). We find modest support for the existence of mergers with extreme spin tilt angles $> 90^\circ$ (the presence of extreme-tilt binaries is favored by a Bayes factor of 10.1). Only one thing is clear: at least some of the LVK binaries formed in the field. At most $89\%$ of binaries are assembled dynamically (99\% credibility), though, the true branching fraction could be much lower, even negligible.

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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