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arXiv 1802.03027astro-ph.GAastro-ph.HEastro-ph.SR
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星系核中星盘相互作用:中心星盘的形成

Star-disc interaction in galactic nuclei: formation of a central stellar disc

Taras Panamarev, Bekdaulet Shukirgaliyev, Yohai Meiron, Peter Berczik, Andreas Just, Rainer Spurzem, Chingis Omarov, Emmanuil Vilkoviskij

摘要:

利用高分辨率的直接$N$体模拟方法研究了活动星系核中吸积盘对恒星动力学的影响。我们发现,核星团(NSC)与气体盘(AD)的相互作用导致在NSC的中心部分形成恒星盘。恒星从星盘吸积到超大质量黑洞上的过程与恒星从NSC捕获到星盘中的过程相平衡,产生一个稳定的密度分布。我们推导出通过AD的迁移时间为NSC的半质量弛豫时间的3%。星盘的质量和大小分别是超大质量黑洞质量的0.7%和影响半径的5%。AD寿命短于迁移时间将导致质量较小的核恒星盘。对这样一个恒星盘的探测可能指向宿主星系核过去的活动。

英文摘要:

We perform high resolution direct $N$-body simulations to study the effect of an accretion disc on stellar dynamics in an active galactic nucleus (AGN). We show that the interaction of the nuclear stellar cluster (NSC) with the gaseous disc (AD) leads to formation of a stellar disc in the central part of the NSC. The accretion of stars from the stellar disc onto the super-massive black hole is balanced by the capture of stars from the NSC into the stellar disc, yielding a stationary density profile. We derive the migration time through the AD to be 3\% of the half-mass relaxation time of the NSC. The mass and size of the stellar disc are 0.7\% of the mass and 5\% of the influence radius of the super-massive black hole. An AD lifetime shorter than the migration time would result in a less massive nuclear stellar disc. The detection of such a stellar disc could point to past activity of the hosting galactic nucleus.

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