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arXiv 2201.08766astro-ph.GAastro-ph.HE
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在高红移星系中超爱丁顿区如何调节黑洞的生长

How the super-Eddington regime regulates black hole growth in high-redshift galaxies

Warren Massonneau, Marta Volonteri, Yohan Dubois, Ricarda S. Beckmann

摘要:

超级爱丁顿吸积是一种可能解释$\sim 10^9\rm\, M_\odot$超大质量黑洞(BH)在宇宙的第一个十亿年内快速聚集的情景。这种临界状态与辐射效率低下的吸积有关,并伴有风和喷流形式的强大外流。通过对孤立星系及其宿主晕中黑洞演化的流体动力学模拟,研究了超爱丁顿反馈对黑洞质量增长的影响。结果表明,超爱丁顿反馈有效地防止BH增长在几个百万年。超爱丁顿吸积事件仍然相对温和,典型的速率约为2-3倍的爱丁顿限制,因为在该制度下的喷流的有效调节。我们发现,这些喷流足够强大,可以从宿主星系的中心以几千秒差距的速度将气体喷射到星系尺度,但不会对这些大尺度的气体流入产生显着影响。通过改变射流反馈效率,我们发现,较弱的超爱丁顿射流允许通过更频繁的超爱丁顿吸积事件更显着的BH增长。我们的结论是,有效的超级爱丁顿增长是可能的,因为我们发现,模拟与弱射流反馈效率提供了一个稍大的BH质量演化在很长一段时间($\sim 80\,\rm Myr$)比BH吸积在爱丁顿限制。

英文摘要:

Super-Eddington accretion is one scenario that may explain the rapid assembly of $\sim 10^9\rm\, M_\odot$ supermassive black holes (BHs) within the first billion year of the Universe. This critical regime is associated with radiatively inefficient accretion and accompanied by powerful outflows in the form of winds and jets. By means of hydrodynamical simulations of BH evolution in an isolated galaxy and its host halo with 12 pc resolution, we investigate how super-Eddington feedback affects the mass growth of the BH. It is shown that super-Eddington feedback efficiently prevents BH growth within a few Myr. The super-Eddington accretion events remain relatively mild with typical rates of about 2-3 times the Eddington limit, because of the efficient regulation by jets in that regime. We find that these jets are powerful enough to eject gas from the centre of the host galaxy all the way up to galactic scales at a few kpc, but do not significantly impact gas inflows at those large scales. By varying the jet feedback efficiency, we find that weaker super-Eddington jets allow for more significant BH growth through more frequent episodes of super-Eddington accretion. We conclude that effective super-Eddington growth is possible, as we find that simulations with weak jet feedback efficiencies provide a slightly larger BH mass evolution over long periods of time ($\sim 80\,\rm Myr$) than that for a BH accreting at the Eddington limit.

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