Extending the halo mass resolution of N-body simulations

Extending the halo mass resolution of N-body simulations
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扩展 N 体模拟的光晕质量分辨率

DOI:
10.1093/mnras/stu1084
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发表时间:
2014
影响因子:
4.8
通讯作者:
Angulo R
Angulo R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Angulo R

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我们提出了一个计划,以扩大暗物质N体模拟晕质量分辨率。该方法使用模拟的密度场来预测不同区域中预期的亚分辨率晕的数量,以给定质量的晕的丰度和偏差因子作为输入。这些量可以通过分析计算或从更高分辨率的模拟中测量。我们发现,该方法恢复的丰度和集群在真实的-和红移-空间的晕质量低于107.5 × 1013 h − 1 M atz= 0优于10%。通过应用该方法的50个低分辨率,大体积的模拟系综,我们计算预期的相关函数和协方差矩阵的发光红星系(LRGs),我们将其与最先进的重子声学振荡测量进行比较。原来的模拟解决只有三分之二的LRG人口,所以我们延长了30倍的晕质量,以恢复所有LRG的分辨率。使用我们的方法,它现在是可行的,以建立大量的高分辨率大体积模拟星系目录计算所需的协方差矩阵分析即将到来的星系调查,旨在探测暗能量。
We present a scheme to extend the halo mass resolution of dark matterN-body simulations. The method uses the simulated density field to predict the number of sub-resolution haloes expected in different regions, taking as input the abundance and the bias factors of haloes of a given mass. These quantities can be computed analytically or measured from higher resolution simulations. We show that the method recovers the abundance and clustering in real- and redshift-space of haloes with mass below ∼7.5 × 1013h−1M⊙atz= 0 to better than 10 per cent. By applying the method to an ensemble of 50 low-resolution, large-volume simulations, we compute the expected correlation function and covariance matrix of luminous red galaxies (LRGs), which we compare to state-of-the-art baryonic acoustic oscillation measurements. The original simulations resolve just two-thirds of the LRG population, so we extend their resolution by a factor of 30 in halo mass in order to recover all LRGs. Using our method, it is now feasible to build the large numbers of high-resolution large volume mock galaxy catalogues required to compute the covariance matrices necessary to analyse upcoming galaxy surveys designed to probe dark energy.
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