模拟Local Group中子晕的分组、合并和生存
The grouping, merging and survival of subhaloes in the simulated Local Group
摘要：
我们使用的约束本地UniversE模拟（CLUES）项目内进行的模拟来研究一个现实的本地组类对象。我们聘请这个小组作为一个数值实验室，从它可能对不同类型的矮星系的起源的影响的角度来研究其subhaloes的人口的演变。重点讨论了卫星在入轨前的潮汐剥离、相互作用、合并和组合过程。潮汐剥离表现在质量吸积和质量损失阶段之间的过渡，在大多数次晕中看到，这发生在落入宿主晕的时刻，以及它们的质量函数的形状随红移的变化。虽然卫星经常形成群体，但它们松散地结合在一起，彼此之间不相互作用。然而，一个大星系群的陷落可以解释观测到的本星系群卫星的特殊分布，但只有在最近才发生的情况下。预期的次晕之间的合并只有在进化的早期阶段才有意义，即7亿年前，那时它们还在宿主晕之外。因此，这些事件可能有助于形成更遥远的早期类型的银河系同伴。一旦次晕进入主晕，合并就变得非常罕见。
英文摘要：
We use a simulation performed within the Constrained Local UniversE Simulation (CLUES) project to study a realistic Local Group-like object. We employ this group as a numerical laboratory for studying the evolution of the population of its subhaloes from the point of view of the effects it may have on the origin of different types of dwarf galaxies. We focus on the processes of tidal stripping of the satellites, their interaction, merging and grouping before infall. The tidal stripping manifests itself in the transition between the phase of mass accretion and mass loss seen in most subhaloes, which occurs at the moment of infall on to the host halo, and the change of the shape of their mass function with redshift. Although the satellites often form groups, they are loosely bound within them and do not interact with each other. The infall of a large group could however explain the observed peculiar distribution of the Local Group satellites, but only if it occurred recently. Mergers between prospective subhaloes are significant only during an early stage of evolution, i.e. more than 7 Gyr ago, when they are still outside the host haloes. Such events could thus contribute to the formation of more distant early type Milky Way companions. Once the subhaloes enter the host halo the mergers become very rare.
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。
