论文标题
银河系合并对偏心核盘的影响：磁盘对齐的机制
Galactic merger implications for eccentric nuclear disks: a mechanism for disk alignment
论文作者
论文摘要
我们最近的大银河邻居M31的核包含一个偏心的核盘，这是一个偏心的，Apsidally-ApsIdally-ApsIdallighthighly Apsidal-Apsidal-ApsIdallightally Apsidal-Apsidal-ApsIdally Aptsidallighthemally-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal-Apsidal Black Black Hole（SMBH）。先前对偏心核盘的研究仅考虑了一个孤立的磁盘，并且在星系合并（尤其是扰动SMBH）下没有研究其动态。在这里，我们介绍了关于偏心磁盘如何受银河合并影响的第一个研究。我们执行N体模拟，以在一系列可能的SMBH初始条件下研究磁盘。磁盘中的第二个SMBH总是会破坏它，但是更遥远的SMBH可以关闭差分进度并稳定磁盘。与隔离磁盘相比，这会导致更一致的磁盘，几乎均匀的偏心曲线以及抑制潮汐破坏事件的抑制。我们还讨论了我们工作对M31中次级SMBH的存在的含义。
The nucleus of our nearest, large galactic neighbor, M31, contains an eccentric nuclear disk--a disk of stars on eccentric, apsidally-aligned orbits around a supermassive black hole (SMBH). Previous studies of eccentric nuclear disks considered only an isolated disk, and did not study their dynamics under galaxy mergers (particularly a perturbing SMBH). Here, we present the first study of how eccentric disks are affected by a galactic merger. We perform N-body simulations to study the disk under a range of different possible SMBH initial conditions. A second SMBH in the disk always disrupts it, but more distant SMBHs can shut off differential precession and stabilize the disk. This results in a more aligned disk, nearly uniform eccentricity profile, and suppression of tidal disruption events compared to the isolated disk. We also discuss implications of our work for the presence of a secondary SMBH in M31.
