The mass function of dark matter haloes
The mass function of dark matter haloes
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DOI：
10.1046/j.1365-8711.2001.04029.x
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发表时间：
2001-02-21
影响因子：
4.8
通讯作者：
Yoshida, N
中科院分区：
文献类型：
--
作者：
Jenkins, A;Frenk, CS;Yoshida, N
我们结合大量n体模拟的数据来预测冷暗物质（CDM）宇宙中超过4个数量级的暗晕的丰度。对不同模拟的比较表明，我们的结果的主要不确定性是系统性的，在所有质量下小于10- 30%，这取决于所使用的光晕定义。特别是，我们对tau CDM和Lambda CDM宇宙学的“哈勃体积”模拟允许以远低于当前所有计划观测调查预期的不确定性来预测大质量星团的丰度。我们表明，对于一系列的CDM宇宙学和一个合适的光晕定义，当用适当的变量表示时，模拟的质量函数几乎与时代、宇宙学参数和初始功率谱无关。这种普遍性正是我们熟悉的Press-Schechter模型所预测的那种，尽管这个模型预测的质量函数形状与我们的数值结果不同，高估了“典型”晕的丰度，而低估了大质量系统的丰度。
We combine data from a number of N-body simulations to predict the abundance of dark haloes in cold dark matter (CDM) universes over more than four orders of magnitude in mass. A comparison of different simulations suggests that the dominant uncertainty in our results is systematic and is smaller than 10-30 per cent at all masses, depending on the halo definition used. In particular, our 'Hubble volume' simulations of tau CDM and Lambda CDM cosmologies allow the abundance of massive clusters to be predicted with uncertainties well below those expected in all currently planned observational surveys. We show that for a range of CDM cosmologies and for a suitable halo definition, the simulated mass function is almost independent of epoch, of cosmological parameters and of the initial power spectrum when expressed in appropriate variables. This universality is of exactly the kind predicted by the familiar Press-Schechter model, although this model predicts a mass function shape that differs from our numerical results, overestimating the abundance of 'typical' haloes and underestimating that of massive systems.