The evolution of substructure in galaxy, group and cluster haloes – III. Comparison with simulations
The evolution of substructure in galaxy, group and cluster haloes – III. Comparison with simulations
复制标题
星系、星团和星团晕中子结构的演化——与模拟的比较。
DOI：
10.1111/j.1365-2966.2005.09581.x
复制
发表时间：
2004
影响因子：
4.8
通讯作者：
A. Babul
中科院分区：
文献类型：
--
作者：
James E. Taylor;A. Babul
在以前的一篇论文中，我们描述了一种新的方法，在基于合并树的晕形成的半解析模型中包含关于子结构的详细信息。在本文中，我们将我们的模型的预测与自洽数值模拟的结果进行了比较。我们发现，总的来说，这两种方法的一致性非常好，特别是在考虑到光晕选择中的数值效应和选择效应的情况下。正如最初对模拟的分析所预期的那样，我们在模拟光晕的最里面的区域看到了一些人工淹没的证据，要么是因为子结构被人为地破坏了，要么是因为用于识别子结构的群发现算法没有检测到最高密度区域中的所有束缚团块。我们的分析结果表明，可能需要更大的质量和力分辨率，才能使数值过合并在所有当前的应用中变得可以忽略。我们讨论了这一结果对晕子结构的观测和实验测试的意义，如分析强透镜系统中的不一致放大比，直接探测暗物质粒子的地面实验，或寻找正电子、伽马射线、中微子或其他暗物质衰变或湮没产物的间接探测实验。
In a previous paper, we described a new method for including detailed information about substructure in semi-analytic models of halo formation based on merger trees. In this paper, we compare the predictions of our model with results from self-consistent numerical simulations. We find that in general the two methods agree extremely well, particularly once numerical effects and selection effects in the choice of haloes are taken into account. As expected from the original analyses of the simulations, we see some evidence for artificial overmerging in the innermost regions of the simulated haloes, either because substructure is being disrupted artificially or because the group-finding algorithms used to identify substructure are not detecting all the bound clumps in the highest-density regions. Our analytic results suggest that greater mass and force resolution may be required before numerical overmerging becomes negligible in all current applications. We discuss the implications of this result for observational and experimental tests of halo substructure, such as the analysis of discrepant magnification ratios in strongly lensed systems, terrestrial experiments to detect dark matter particles directly or indirect detection experiments searching for positrons, gamma-rays, neutrinos or other dark matter decay or annihilation products.