SONGLINES FROM DIRECT COLLAPSE SEED BLACK HOLES: EFFECTS OF X-RAYS ON BLACK HOLE GROWTH AND STELLAR POPULATIONS
SONGLINES FROM DIRECT COLLAPSE SEED BLACK HOLES: EFFECTS OF X-RAYS ON BLACK HOLE GROWTH AND STELLAR POPULATIONS
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来自直接塌缩种子黑洞的歌曲：X 射线对黑洞生长和恒星种群的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
R. Meijerink
中科院分区：
文献类型：
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作者：
A. Aykutalp;J. Wise;M. Spaans;R. Meijerink
在过去的十年中，超大质量黑洞（SMBH）的增长与星系的形成和演化有着错综复杂的联系，并且是星系组装的关键因素。为了研究SMBHs的起源，我们进行了宇宙学模拟，目标是在两个不同的强莱曼-沃纳（LW）背景场的存在下，直接坍缩黑洞种子形成的情况。这些模拟包括来自中心大质量黑洞（MBH）的X射线辐射，H2自屏蔽，以及来自无金属和富金属恒星的恒星反馈。我们发现，在这两个模拟，本地X射线反馈诱导无金属星星形成后MBH的形式约0.5百万年。MBH的吸积速率在两个模拟中都达到了10−3 M yr−1的最大值。然而，占空比不同，并且对于高LW和低LW情况分别推导为6%和50%。在1亿年中，高LW情况下的MBH仅增长1.6%，而在低LW情况下为16%。我们发现，最大吸积率是由当地的气体热力学，而占空比是由大规模的气体动力学和天然气储层。我们的结论是，辐射反馈从中央MBH起着重要的作用，在星星形成的核区域和扼杀初始MBH增长相对于典型的爱丁顿速率参数，和初始MBH增长可能会受到本地LW辐射场。
In the last decade, the growth of supermassive black holes (SMBHs) has been intricately linked to galaxy formation and evolution and is a key ingredient in the assembly of galaxies. To investigate the origin of SMBHs, we perform cosmological simulations that target the direct collapse black hole seed formation scenario in the presence of two different strong Lyman–Werner (LW) background fields. These simulations include the X-ray irradiation from a central massive black hole (MBH), H2 self-shielding, and stellar feedback from metal-free and metal-enriched stars. We find in both simulations that local X-ray feedback induces metal-free star formation ∼0.5 Myr after the MBH forms. The MBH accretion rate reaches a maximum of 10−3 M☉ yr−1 in both simulations. However, the duty cycle differs and is derived to be 6% and 50% for the high and low LW cases, respectively. The MBH in the high LW case grows only ∼6% in 100 Myr compared to 16% in the low LW case. We find that the maximum accretion rate is determined by the local gas thermodynamics, whereas the duty cycle is determined by the large-scale gas dynamics and gas reservoir. We conclude that radiative feedback from the central MBH plays an important role in star formation in the nuclear regions and stifling initial MBH growth relative to the typical Eddington rate argument, and that initial MBH growth might be affected by the local LW radiation field.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.
解开第一个星系中的肥胖黑洞
影响因子：
4.8
作者：
Agarwal B
通讯作者：
Agarwal B