论文标题
事件地平线望远镜对银河中心恒星轨道的旋转约束的影响
Implication of spin constraints by the Event Horizon Telescope on stellar orbits in the Galactic Center
论文作者
论文摘要
银河系的中心设有最接近的超级质量黑洞，sgra $^*$。数十年来我们银河中心的近红外观察结果表明，存在少量恒星（所谓的S-Star群集）绕着sgra $^*$的旋风，最近据报道它们在两个正交磁盘中布置。在这种情况下，S-Star的晶状体刺激性分动的时间尺度应该比其年龄更长，这意味着Sgra $^*$的旋转率低。相比之下，活动Horizon望远镜的最新结果偏向于高度旋转的Sgra $^*$，这似乎表明S-Stars不能在磁盘中安装。另外，Sgra $^*$的旋转必须很小，这表明其观察到的图像的模型不完整。
The center of the Milky Way hosts the closest supermassive black hole, SgrA$^*$. Decades of near-infrared observations of our Galactic Center have shown the presence of a small population of stars (the so called S-star cluster) orbiting SgrA$^*$, which were recently reported to be arranged in two orthogonal disks. In this case, the timescale for Lense-Thirring precession of S-stars should be longer than their age, implying a low spin for SgrA$^*$. In contrast, the recent results by the Event Horizon Telescope favor a highly-spinning SgrA$^*$, which seem to suggest that the S-stars could not be arranged in disks. Alternatively, the spin of SgrA$^*$ must be small, suggesting that the models for its observed image are incomplete.
