TROJAN STARS IN THE GALACTIC CENTER
TROJAN STARS IN THE GALACTIC CENTER
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DOI：
10.1088/0004-637x/695/2/1421
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
M. Fujii;M. Iwasawa;Y. Funato;Junichiro Makino
中科院分区：
文献类型：
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作者：
M. Fujii;M. Iwasawa;Y. Funato;Junichiro Makino
我们首次使用完全自洽的 N 体模型模拟了银河系中心 (GC) 附近形成的星团的旋入。在我们的模型中，中心超大质量黑洞（SMBH）被恒星和星团包围。不仅恒星和星团恒星的轨道自洽整合，而且还包括星团恒星的恒星演化、碰撞和合并。我们发现，星团中形成了一个中等质量黑洞（IMBH），从星团中逃逸的恒星被捕获，与 IMBH 形成 1:1 的平均运动共振。这些“特洛伊”恒星被 IMBH 带到靠近 SMBH，由于动力摩擦，IMBH 螺旋进入 GC。我们的结果表明，一旦中质量黑洞形成，即使在星团本身被破坏之后，它也会将大质量恒星带到中央超大质量黑洞附近。 IMBH 携带的恒星形成一个类似于观测到的盘的盘，并且包括 IMBH 在内的星团核心具有与 IRS13E 类似的特性，IRS13E 是几颗年轻恒星的紧凑集合。
We performed, for the first time, the simulation of spiral-in of a star cluster formed close to the Galactic center (GC) using a fully self-consistent N-body model. In our model, the central supermassive black hole (SMBH) is surrounded by stars and the star cluster. Not only are the orbits of stars and the cluster stars integrated self-consistently, but the stellar evolution, collisions and merging of the cluster stars are also included. We found that an intermediate-mass black hole (IMBH) is formed in the star cluster and stars escaped from the cluster are captured into a 1:1 mean motion resonance with the IMBH. These “Trojan” stars are brought close to the SMBH by the IMBH, which spirals into the GC due to the dynamical friction. Our results show that, once the IMBH is formed, it brings the massive stars to the vicinity of the central SMBH even after the star cluster itself is disrupted. Stars carried by the IMBH form a disk similar to the observed disks and the core of the cluster including the IMBH has properties similar to those of IRS13E, which is a compact assembly of several young stars.