Two disks of young stars have recently been discovered in the Galactic center. The disks are rotating in the gravitational field of the central black hole at radii r ～ 0.1-0.3 pc and thus open a new opportunity to measure the central mass. We find that the observed motion of stars in the clockwise disk implies the mass within -0.1 pc M = (4.3 ± 0.5) x 10~6 solar mass for the fiducial distance to the Galactic center R_0 = 8 kpc, and we derive the scaling of M with R_0. As a tool for our estimate we use orbital roulette, a recently developed method. The method reconstructs the three-dimensional orbits of the disk stars and checks the randomness of their orbital phases. We also estimate the three-dimensional positions and orbital eccentricities of the clockwise-disk stars.
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机译：最近在银河系中心发现了两颗年轻的恒星。圆盘在中心黑洞的引力场中以半径r〜0.1-0.3 pc旋转，从而为测量中心质量开辟了新的机会。我们发现，观测到的恒星在顺时针方向盘中的运动暗示着相对于银河系中心的基准距离R_0 = 8 kpc的质量为-0.1 pc M =（4.3±0.5）x 10〜6太阳质量，并且得出了标度M与R_0。作为我们估算的一种工具，我们使用一种最新开发的方法-轮盘赌。该方法重建了盘状星的三维轨道，并检查了它们的轨道相位的随机性。我们还估计了顺时针盘状恒星的三维位置和轨道偏心率。
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