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arXiv 1702.00407astro-ph.GA
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直接坍缩黑洞宿主的金属丰度演化:CR7的个例研究

Metallicity evolution of direct collapse black hole hosts: CR7 as a case study

Bhaskar Agarwal, Jarrett L. Johnson, Sadegh Khochfar, Eric Pellegrini, Claes-Erik Rydberg, Ralf S. Klessen, Pascal Oesch

摘要:

在这项研究中,我们集中在$z\sim6.6$莱曼- $α$ CR 7组成的集群A是主机的潜在直接崩溃黑洞(DCBH),和两个金属富集的恒星形成集群B和C。与金属特征排除DCBH存在的说法相反,我们表明,来自恒星形成团块B和C的A的金属污染是不可避免的,并且A可以在其金属丰度超过$10^{-5}-10^{-6}\ \rm Z_{\odot}$的临界阈值之前形成DCBH。假设金属混合瞬间发生,我们根据B和C的恒星形成历史推导出A的金属丰度。我们发现,将A中$10^6-10^7\ \rm M_{\odot}$的最终吸积黑洞处理为星云发射已经将其$H_{160}$ - [3.6]和[3.6]-[4.5]色推到3 $σ$观测极限。因此,我们表明,在DCBH主机中的金属的存在是不可避免的,这是共同进化的LW辐射场和金属来自邻近星系,管辖DCBH形成在一个邻近的{最初}原始原子冷却晕。

英文摘要:

In this study we focus on the $z\sim6.6$ Lyman-$α$ CR7 consisting of clump A that is host to a potential direct collapse black hole (DCBH), and two metal enriched star forming clumps B and C. In contrast to claims that signatures of metals rule out the existence of DCBHs, we show that metal pollution of A from star forming clumps clumps B and C is inevitable, and that A can form a DCBH well before its metallicity exceeds the critical threshold of $10^{-5}-10^{-6}\ \rm Z_{\odot}$. Assuming metal mixing happens instantaneously, we derive the metallicity of A based on the star formation history of B and C. We find that treating a final accreting black hole of $10^6-10^7\ \rm M_{\odot}$ in A for nebular emission already pushes its $H_{160}$ - [3.6] and [3.6]-[4.5] colours into the 3$σ$ limit of observations. Hence, we show that the presence of metals in DCBH hosts is inevitable, and that it is the coevolution of the LW radiation field and metals originating from neighbouring galaxies that governs DCBH formation in a neighbouring {initially} pristine atomic cooling haloes.

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