关于Milky Way周围动力冷环的起源
On the Origin of Dynamically Cold Rings Around the Milky Way
摘要：
我们提出了一个方案，通过高偏心率，飞越遇到动态冷环围绕银河系的生产。这些初始条件比以前的作品中考虑的更宇宙动机。我们发现，我们研究的相遇通常会在低偏心率轨道上产生一系列近乎动态的冷环状特征，这些特征通过主星系对卫星近距离通过的潮汐响应而持续约2-4 Gyr的时间尺度。此外，它们在质量和数量上都与麒麟座环的分布、运动学和恒星星族相似。因此，我们发现，一个高偏心率的卫星星系飞越代表了一个宇宙学上有吸引力的方案，形成运动学上不同的环状特征围绕银河系。
英文摘要：
We present a scenario for the production of dynamically cold rings around the Milky Way via a high-eccentricity, flyby encounter. These initial conditions are more cosmologically motivated than those considered in previous works. We find that the encounters we examine generically produce a series of nearly dynamically cold ring-like features on low-eccentricity orbits that persist over timescales of ~2-4 Gyr via the tidal response of the primary galaxy to the close passage of the satellite. Moreover, they are both qualitatively and quantitatively similar to the distribution, kinematics, and stellar population of the Monoceros ring. Therefore, we find that a high eccentricity flyby by a satellite galaxy represents a cosmologically appealing scenario for forming kinematically distinct ring-like features around the Milky Way.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
