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arXiv 2107.00701astro-ph.GAastro-ph.HE
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早期宇宙中超临界尘埃BH的增长

Supercritical dusty BH growth in the early Universe

W. Ishibashi

摘要:

超大质量黑洞(带有$\mathrm{M_{BH} \sim 10^9 M_{\odot}}$)在宇宙的第一个陀螺中被观测到,它们的宿主星系被发现含有大量的尘埃和金属。根据这两个经验事实,我们探讨了尘埃环境中超临界吸积和早期黑洞生长的可能性。我们将光子俘获的概念推广到尘埃气体的情况,并分析了尘埃光子俘获的物理条件。考虑到参数空间的依赖性,我们得到的尘埃光子捕获制度,可以更容易地实现较大的黑洞质量,较高的环境气体密度,和较低的气体温度。吸积流中的光子捕获意味着活动星系核(AGN)被遮蔽,而它可能允许早期快速的黑洞质量积聚。我们讨论了这种尘埃光子捕获在早期宇宙中大质量黑洞超临界生长中的潜在作用。

英文摘要:

Supermassive black holes (with $\mathrm{M_{BH} \sim 10^9 M_{\odot}}$) are observed in the first Gyr of the Universe, and their host galaxies are found to contain unexpectedly large amounts of dust and metals. In light of the two empirical facts, we explore the possibility of supercritical accretion and early black hole growth occurring in dusty environments. We generalise the concept of photon trapping to the case of dusty gas and analyse the physical conditions leading to dust photon trapping. Considering the parameter space dependence, we obtain that the dust photon trapping regime can be more easily realised for larger black hole masses, higher ambient gas densities, and lower gas temperatures. The trapping of photons within the accretion flow implies obscured active galactic nuclei (AGNs), while it may allow a rapid black hole mass build-up at early times. We discuss the potential role of such dust photon trapping in the supercritical growth of massive black holes in the early Universe.

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