论文标题
由潮汐破坏事件触发的银河中心中的恒星磁盘
Disks of Stars in the Galactic center triggered by Tidal Disruption Events
论文作者
论文摘要
除了超大型黑洞（SMBH）外，银河系的中央帕尔萨克（Mirky Way）的中央帕尔萨克（Parsec）拥有一百多个大型，高速的年轻恒星，它们的存在以及其中一个子集的一个或可能是两个错误的磁盘，令人困惑。由于中等密度和强大的潮汐力在Sgr a*附近的结合，预计不会形成恒星。在这里，我们为它们的原位形成提出了一个新的方案：一个较旧的流浪恒星的喷气式潮汐破坏事件（TDE）触发了垂直于喷气机的恒星形成的积极反馈，正如垂直于喷气机的恒星形成》中，如在银色反馈中的喷气诱导反馈的上下文中通过数值模拟所证明的。围绕射流冲击压缩的过度压力的茧可将团块变成足够高的密度，以抵抗SMBH潮汐场。 $ 10^{ - 5} -10^{ - 4} $ yr $^{ - 1} $的TDE速率每一个星系$，其中几个百分之几的事件被喷射，这意味着每个星系每年发生一次喷气式TDE事件每隔几百万年就会发生。有趣的是，有趣的是，磁盘星的年龄相同。我们机制预测的质量功能是最高的。此外，由于TDE是各向同性的，因此我们的模型预测了相对于星系平面的恒星磁盘的随机取向，并且由于TDE速率相对较高，因此可以考虑多个具有无关方向的恒星磁盘。
In addition to a supermassive black hole (SMBH), the central parsec of the Milky Way hosts over a hundred of massive, high velocity young stars whose existence, and organisation of a subset of them in one, or possibly two, mis-aligned disks, is puzzling. Due to a combination of low medium density and strong tidal forces in the vicinity of Sgr A*, stars are not expected to form. Here we propose a novel scenario for their in-situ formation: a jetted tidal disruption event (TDE) from an older wandering star triggers an episode of positive feedback of star formation in the plane perpendicular to the jet, as demonstrated via numerical simulations in the context of jet-induced feedback in galactic outflows. An over-pressured cocoon surrounding the jet shock-compresses clumps to densities high enough to resist the SMBH tidal field. The TDE rate of $10^{-5}-10^{-4}$ yr$^{-1}$ per galaxy, out of which a few percent events are jetted, implies a jetted TDE event per galaxy to occur every few million years. This timescale is interestingly of the same order of the age of the disk stars. The mass function predicted by our mechanism is top-heavy. Additionally, since TDEs are isotropic, our model predicts a random orientation for the disk of stars with respect to the plane of the galaxy and, due to the relatively high TDE rate, it can account for multiple disks of stars with uncorrelated orientations.
