论文标题
巨型：结构形成的合并图
MEGA: Merger graphs of structure formation
论文作者
论文摘要
遵循宇宙中结构的生长时，我们建议用合并图代替合并树，其中光环可以合并并分成单独的碎片。我们表明，这导致质量增长更顺畅，并消除了灾难性的失败，其中巨大的光环没有祖细胞或后代。对于那些喜欢坚持合并树的人，我们发现从合并图中得出的树具有与以前的方法相似的质量生长特性，但又没有灾难性的失败。对于未来的星系形成建模，可以使用两个不同的密度阈值来区分宿主光环（扩展的银河系光环，组和簇）与高密度亚李斯群体：星系形成的位点。
When following the growth of structure in the Universe, we propose replacing merger trees with merger graphs, in which haloes can both merge and split into separate pieces. We show that this leads to smoother mass growth and eliminates catastrophic failures in which massive haloes have no progenitors or descendants. For those who prefer to stick with merger trees, we find that trees derived from our merger graphs have similar mass growth properties to previous methods, but again without catastrophic failures. For future galaxy formation modelling, two different density thresholds can be used to distinguish host haloes (extended galactic haloes, groups and clusters) from higher-density subhaloes: sites of galaxy formation.
