流浪的星星：逃亡人口的起源
Wandering Stars: an Origin of Escaped Populations
摘要：
我们证明，超出星系维里半径的恒星可能是由卫星通过其轨道近心时接收到的引力脉冲产生的。这些恒星可能变得能量不受束缚（逃逸星），或者可能在几个Gyr以上的时间内移动到比几个维里半径更远的地方，但仍然保持与系统的能量束缚（流浪星）。较大的卫星（质量为母星的10-100%）和更多径向轨道上的卫星是大多数被抛出的卫星。游荡的恒星可以通过经典新星在Mpc尺度上观察到，通过SNIa在100 Mpc尺度上观察到。这类恒星的存在意味着银河系中存在着一群几乎不受约束的、年老的、高速的恒星，它们在银河系形成时期由相同的物理机制产生。这些组合群体的大小和性质应该对它们所来自的祖先天体的轨道和质量施加一些限制，从而提供对星系合并历史的洞察，特别是银河系。
英文摘要：
We demonstrate that stars beyond the virial radii of galaxies may be generated by the gravitational impulse received by a satellite as it passes through the pericenter of its orbit around its parent. These stars may become energetically unbound (escaped stars), or may travel to further than a few virial radii for longer than a few Gyr, but still remain energetically bound to the system (wandering stars). Larger satellites (10-100% the mass of the parent), and satellites on more radial orbits are responsible for the majority of this ejected population. Wandering stars could be observable on Mpc scales via classical novae, and on 100 Mpc scales via SNIa. The existence of such stars would imply a corresponding population of barely-bound, old, high velocity stars orbiting the Milky Way, generated by the same physical mechanism during the Galaxy's formation epoch. Sizes and properties of these combined populations should place some constraints on the orbits and masses of the progenitor objects from which they came, providing insight into the merging histories of galaxies in general and the Milky Way in particular.
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。
