论文标题
重新审视动力摩擦：全球模式和本地唤醒的作用
Revisiting dynamical friction: the role of global modes and local wakes
论文作者
论文摘要
较大系统内的垂直剂的轨道衰变在许多天体物理系统的动力学中起着关键作用 - 从星系中的核恒星簇或球状簇到银河核中的巨大黑洞，到在大型大型银河系的暗物质晕射击中矮星系卫星矮星系卫星。数十年来，一直有各种尝试来确定阻力机制的基本物理和时间尺度，从局部动力学方法到基于背景系统中诱导的全局模式的后反应的描述。我们提出了超高分辨率的$ n $ - 体体模拟大规模卫星的模拟，绕着银河系般的星系（带有$> 10^8 $颗粒），似乎捕获了主要光环中引起的本地“唤醒”和全局“模式”。我们直接从局部和全局扰动的综合作用中直接解决了轨道衰变的机理，并专门分析了大部分扭矩的起源。
The orbital decay of a perturber within a larger system plays a key role in the dynamics of many astrophysical systems -- from nuclear star clusters or globular clusters in galaxies, to massive black holes in galactic nuclei, to dwarf galaxy satellites within the dark matter halos of more massive galaxies. For many decades, there have been various attempts to determine the underlying physics and time-scales of the drag mechanism, ranging from the local dynamical friction approach to descriptions based on the back-reaction of global modes induced in the background system. We present ultra-high-resolution $N$-body simulations of massive satellites orbiting a Milky Way-like galaxy (with $> 10^8$ particles), that appear to capture both the local "wake" and the global "mode" induced in the primary halo. We address directly the mechanism of orbital decay from the combined action of local and global perturbations and specifically analyze where the bulk of the torque originates.
