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arXiv 2310.03074astro-ph.HEastro-ph.GAgr-qc
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黑洞质量函数随红移演化的证据

Evidence for the evolution of black hole mass function with redshift

Stefano Rinaldi, Walter Del Pozzo, Michela Mapelli, Ana Lorenzo-Medina, Thomas Dent

AI总结:

本文利用 LIGO-Virgo-KAGRA 引力波数据和贝叶斯非参数方法重建黑洞质量分布,发现主质量和质量比随红移演化,较轻黑洞子群在 z>0.4 处消失,揭示了金属丰度趋势或多种随红移变化的形成通道。

摘要:

我们利用 LIGO-Virgo-KAGRA 合作组织检测到并包含在第三引力波瞬变星表中的引力波事件,研究了天体物理黑洞的联合主质量、质量比和红移观测分布。我们使用贝叶斯非参数方法重建了这一分布,这些方法是数据驱动的模型,能够在最少的数学假设下推断任意概率密度。我们发现了主质量和质量比分布随红移演化的证据:我们的分析显示在主质量-红移平面上存在两个截然不同的子群,其中较轻的子群($\lesssim$ 20 $M_\odot$)在较高红移($z > 0.4$)处消失。质量比分布未显示对对称双星的支持。观测到的双黑洞并合群体随回溯时间演化,表明金属丰度随红移存在趋势,和/或存在多个依赖于红移的形成通道。

英文摘要:

We investigate the joint primary mass, mass ratio, and redshift observed distribution of astrophysical black holes using the gravitational wave events detected by the LIGO-Virgo-KAGRA collaboration and included in the third gravitational wave transient catalogue. We reconstruct this distribution using Bayesian non-parametric methods, which are data-driven models able to infer arbitrary probability densities under minimal mathematical assumptions. We find evidence for the evolution with redshift of both the primary mass and mass ratio distribution: our analysis shows the presence of two distinct sub-populations in the primary mass - redshift plane, with the lighter population, $\lesssim$ 20 $M_\odot$, disappearing at higher redshifts, $z > 0.4$. The mass ratio distribution shows no support for symmetric binaries. The observed population of coalescing binary black holes evolves with look-back time, suggesting a trend in metallicity with redshift and/or the presence of multiple, redshift-dependent formation channels.

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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