The age dependence of halo clustering
The age dependence of halo clustering
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DOI：
10.1111/j.1745-3933.2005.00084.x
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发表时间：
2005-06
影响因子：
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通讯作者：
Liang Gao;V. Springel;S. White
中科院分区：
文献类型：
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作者：
Liang Gao;V. Springel;S. White
我们使用一个非常大的符合Λ冷暗物质宇宙学的模拟来研究暗物质晕的聚类。对于质量小于约\(10^{13}h^{-1}M_{\odot}\)的晕，大尺度上两点相关函数的振幅强烈依赖于晕的形成时间。在高红移时形成的晕比近期形成的晕聚集程度要高得多。这种效应是晕形成时间的一个平滑函数，且其振幅随着晕质量的减小而增大。在\(10^{11}h^{-1}M_{\odot}\)时，最“古老”的\(10\%\)的晕的相关性比最“年轻”的\(10\%\)的晕强五倍以上。这个出乎意料的结果与结构增长的标准逸出集理论不相符，并且它与常用于研究星系聚类的晕占据分布模型的一个基本假设相矛盾，即给定质量的晕中的星系含量在统计上与其大尺度环境无关。
We use a very large simulation of the concordance Λ cold dark matter cosmogony to study the clustering of dark matter haloes. For haloes less massive than about 1013 h−1 M⊙ the amplitude of the two-point correlation function on large scales depends strongly on halo formation time. Haloes that assembled at high redshift are substantially more clustered than those that assembled more recently. The effect is a smooth function of halo formation time and its amplitude increases with decreasing halo mass. At 1011 h−1 M⊙ the ‘oldest’ 10 per cent of haloes are more than five times more strongly correlated than the ‘youngest’ 10 per cent. This unexpected result is incompatible with the standard excursion set theory for structure growth, and it contradicts a fundamental assumption of the halo occupation distribution models often used to study galaxy clustering, namely that the galaxy content of a halo of given mass is statistically independent of its larger scale environment.