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arXiv 2006.11399astro-ph.GA
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银河系中心S星团的运动学结构

Kinematic Structure of the Galactic Center S-cluster

Basel Ali, Daria Paul, Andreas Eckart, Marzieh Parsa, Michal Zajacek, Florian Peißker, Matthias Subroweit, Monica Valencia-S., Lauritz Thomkins, Gunther Witzel

摘要:

我们提出了一个详细的112颗恒星的运动学分析,主要包括高速S-集群和轨道的超大质量黑洞SgrA* 在银河系的中心。其中39个已知轨道根数,其余的已知自行。倾角的分布和自行飞行方向明显偏离均匀分布,如果轨道的方向是随机的,人们会期望均匀分布。在中央角秒的范围内,S星团的恒星排列成两个几乎是边缘的圆盘,它们相对于银河平面的位置角大约为+-45 °。每个星盘中恒星的角动量矢量都指向两个方向,也就是说,给定星盘中的恒星以相反的方式旋转。这种结构的极点位于只有约25 o的视线。这种结构可能是一个共振过程的结果,该过程始于大约600万年前星团中年轻B矮星的形成。或者,它表明在距离中心的距离与紧凑恒星协会IRS 13的距离相当的干扰星的存在。

英文摘要:

We present a detailed analysis of the kinematics of 112 stars that mostly comprise the high velocity S-cluster and orbit the super massive black hole SgrA* at the center of the Milky Way. For 39 of them orbital elements are known, for the remainder we know proper motions. The distribution of inclinations, and proper motion flight directions deviate significantly from a uniform distribution which one expects if the orientation of the orbits are random. Across the central arcseconds the S-cluster stars are arranged in two almost edge on disks that are located at a position angle approximately +-45 o with respect to the Galactic plane. The angular momentum vectors for stars in each disk point in both directions, i.e. the stars in a given disk rotate in opposite ways. The poles of this structure are located only about 25 o from the line of sight. This structure may be the result of a resonance process that started with the formation of the young B-dwarf stars in the cluster about 6 Myr ago. Alternatively, it indicated the presence of a disturber at a distance from the center comparable to the distance of the compact stellar association IRS13.

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