论文标题
银河核中圆盘上的共振摩擦
Resonant friction on discs in galactic nuclei
论文作者
论文摘要
我们认为共振摩擦对圆盘的旋转方向与宿主核恒星簇的旋转方向未对准。圆盘的重力导致集群的重力扰动，从而使圆盘上的强扭矩施加强大的扭矩。我们认为，这种扭矩可能是导致银河系中心中年轻恒星顺时针盘的破坏，并在数值实验中显示出它在恒星的角动量分布中产生观察到的特征。更普遍地，我们推测，核星形簇的旋转对位于其中心的超质量黑洞周围的瞬态大质量盘的方向具有稳定作用，因此在黑洞旋转的方向和大小上具有稳定的作用。
We argue that resonant friction has a dramatic effect on a disc whose rotation direction is misaligned with that of its host nuclear star cluster. The disc's gravity causes gravitational perturbation of the cluster that in turn exerts a strong torque back onto the disc. We argue that this torque may be responsible for the observed disruption of the clockwise disc of young stars in the Galactic Center, and show in numerical experiments that it produces the observed features in the distribution of the stars' angular momenta. More generally, we speculate that the rotation of nuclear star clusters has a stabilizing effect on the orientation of transient massive accretion discs around the supermassive black holes residing in their centers, and thus on the directions and magnitudes of the black-hole spins.
