论文标题
从卫星合并中倾斜恒星磁盘的动力学
Dynamics of Stellar Disk Tilting from Satellite Mergers
论文作者
论文摘要
银河系的恒星磁盘可能会响应于卫星星系及其相关的潮汐碎片而导致的扭矩。在这项工作中，我们通过在一个孤立的，各向同性的银河系状的宿主星系中运行合并的N体模拟来探索磁盘倾斜的动力学，在卫星病毒质量，初始位置和轨道上有所不同。我们发展并验证了对主机Galaxy恒星磁盘如何对卫星的暗物质碎片做出反应的动态的第一原则的理解。我们发现，对于宇宙学动机的合并历史，磁盘倾斜的程度可能很大。特别是，我们的结果表明，银河系磁盘可能仍在响应Gaia-Sausage-Ecceladus，这是银河系历史上最重要的合并之一。这些发现对陆地直接检测实验具有影响，因为磁盘倾斜会改变太阳在合并星系留下的暗物质子结构方面的相对位置。
The Milky Way's stellar disk can tilt in response to torques that result from infalling satellite galaxies and their associated tidal debris. In this work, we explore the dynamics of disk tilting by running N-body simulations of mergers in an isolated, isotropic Milky Way-like host galaxy, varying over satellite virial mass, initial position, and orbit. We develop and validate a first-principles understanding of the dynamics that govern how the host galaxy's stellar disk responds to the satellite's dark matter debris. We find that the degree of disk tilting can be large for cosmologically-motivated merger histories. In particular, our results suggest that the Galactic disk may still be tilting in response to Gaia-Sausage-Enceladus, one of the most significant recent mergers in the Milky Way's history. These findings have implications for terrestrial direct detection experiments as disk tilting changes the relative location of the Sun with respect to dark matter substructure left behind by a merging galaxy.
