银河系中心扭曲的年轻恒星盘
The warped young stellar disc in the Galactic Centre
摘要：
在银河系的中央秒差距内，观测到几十颗年轻恒星围绕着中央的超大质量黑洞旋转。这些恒星的一个子集形成了一个相干旋转的圆盘。其他的观测结果显示了一个巨大的分子环，位于距离中心约1.5秒差距的半径处。在本文中，我们考虑的引力影响的分子环面上的恒星的恒星盘。我们推导出一个分析公式的岁差率的个别恒星的轨道，我们表明，它是高度敏感的轨道半长轴和倾斜度相对于平面的环面，以及对质量的环面。假设恒星盘和分子环在大于600万年的时间尺度上都是稳定的，我们限制了环的质量和相对于年轻恒星盘的倾角。我们进一步认为，在银河系中心观测到的所有年轻恒星可能都有一个共同的起源，即一个张角<5度的相干旋转结构，在其生命周期中，由于分子环面的引力影响，该结构被部分破坏（扭曲）。
英文摘要：
Within the central parsec of the Galaxy, several tens of young stars orbiting a central supermassive black hole are observed. A subset of these stars forms a coherently rotating disc. Other observations reveal a massive molecular torus which lies at a radius ~1.5pc from the centre. In this paper we consider the gravitational influence of the molecular torus upon the stars of the stellar disc. We derive an analytical formula for the rate of precession of individual stellar orbits and we show that it is highly sensitive upon the orbital semi-major axis and inclination with respect to the plane of the torus as well as on the mass of the torus. Assuming that both the stellar disc and the molecular torus are stable on the time-scale >6Myr, we constrain the mass of the torus and its inclination with respect to the young stellar disc. We further suggest that all young stars observed in the Galactic Centre may have a common origin in a single coherently rotating structure with an opening angle <5deg, which was partially destroyed (warped) during its lifetime by the gravitational influence of the molecular torus.
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