The effectiveness of the Kozai mechanism in the Galactic Centre
The effectiveness of the Kozai mechanism in the Galactic Centre
复制标题
Kozai机制在银河系中心的有效性
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
P. Chang
中科院分区：
文献类型：
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作者：
P. Chang
我检查的有效性Kozai振荡的星系中心，特别是银河系中心（GC）使用标准的技术从天体力学。特别是，我研究的恒星膨胀潜力和广义相对论的Kozai振荡，这是由恒星盘诱导的影响。Lockmann等人最近提出，GC中两个年轻的大质量恒星盘引起的Kozai振荡将年轻恒星的轨道驱动到大偏心率（e 1）。如果这些年轻的偏心恒星中有一些是双星，它们将在近心点附近分裂，留下一颗星星在围绕中心超大质量黑洞的紧密轨道上，并产生S-星星种群。我发现，球形恒星隆起抑制Kozai振荡，当它的封闭质量内的测试机构是在恒星盘（S）的质量的顺序。由于GC中的恒星凸起比恒星盘大得多，因此恒星盘引起的Kozai振荡可能会被抑制。Kozai振荡是否是由其他非球形成分（例如扁平的恒星凸起）引起的，还有待确定。
I examine the effectiveness of Kozai oscillations in the centres of galaxies and in particular the Galactic Centre (GC) using standard techniques from celestial mechanics. In particular, I study the effects of a stellar bulge potential and general relativity on Kozai oscillations, which are induced by stellar discs. Lockmann et al. recently suggested that Kozai oscillations induced by the two young massive stellar discs in the GC drive the orbits of the young stars to large eccentricity (e ≈ 1). If some of these young eccentric stars are in binaries, they would be disrupted near pericentre, leaving one star in a tight orbit around the central supermassive black hole and producing the S-star population. I find that the spherical stellar bulge suppresses Kozai oscillations, when its enclosed mass inside a test body is of the order of the mass in the stellar disc(s). Since the stellar bulge in the GC is much larger than the stellar discs, Kozai oscillations due to the stellar discs are likely suppressed. Whether Kozai oscillations are induced from other non-spherical components to the potential (e.g. a flattened stellar bulge) is yet to be determined.
DOI：
10.1086/591734
发表时间：
2008-07
期刊：
The Astrophysical Journal Letters
影响因子：
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作者：
Ulf Löckmann;H. Baumgardt;P. Kroupa
通讯作者：
Ulf Löckmann;H. Baumgardt;P. Kroupa