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arXiv 2311.04877astro-ph.GA
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将核心星系性质与大质量黑洞双星族群联系起来

Connecting Core Galaxy Properties to the Massive Black Hole Binary Population

CJ Harris, Kayhan Gultekin

AI总结:

本研究利用 IllustrisTNG 与 N 体约束的后处理模型,量化大质量黑洞双星质量比和气体质量分数对核心星系形成与抹去的影响。

摘要:

我们研究大质量黑洞双星的性质如何影响核心星系的观测性质。我们将核心星系中恒星质量亏损随总恒星质量变化的观测趋势,与 IllustrisTNG 中的预测趋势进行比较。我们基于文献中 N 体实验的结果,通过应用子网格后处理物理过程来计算模拟星系的质量亏损。我们发现,能够形成核心的最小双星质量比的后验分布中值为 0.7。对于核心被抹去所对应的气体质量分数阈值,我们得到的中值为 0.6。因此,低质量比双星不会促成核心形成,而富气体并合必定会导致星系核内部的恒星形成,最终抹去核心。这些约束对整个大质量黑洞双星族群、黑洞—星系协同演化以及引力波背景的起源都具有重要意义。

英文摘要:

We investigate how the properties of massive black hole binaries influence the observed properties of core galaxies. We compare the observed trend in stellar mass deficit as a function of total stellar mass in the core galaxy with predicted trends in IllustrisTNG. We calculate mass deficits in simulated galaxies by applying sub-grid, post-processing physics based on the results of literature N-body experiments. We find the median value of the posterior distribution for the minimum binary mass ratio capable of creating a core is 0.7. For the gas mass fraction above which a core is erased we find a median value of 0.6. Thus low mass ratio binaries do not contribute to core formation and gas-rich mergers must lead to star formation within the nucleus, ultimately erasing the core. Such constraints have important implications for the overall massive black hole binary population, black hole-galaxy co-evolution, and the origin of the gravitational wave background.

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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