The Impact of Baryonic Physics on the Abundance, Clustering, and Concentration of Halos
The Impact of Baryonic Physics on the Abundance, Clustering, and Concentration of Halos
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DOI：
10.3847/1538-4357/ac1e27
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
G. Beltz-Mohrmann;A. Berlind
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文献类型：
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作者：
G. Beltz-Mohrmann;A. Berlind
我们与仅暗物质（DMO）模拟相比，研究了重子物理对流体动力学模拟中晕分布的影响。我们发现，一般来说，DMO 模拟产生的晕质量函数 (HMF) 由于缺乏重子物理，其晕质量比其流体动力学对应物转移到更高的晕质量。然而，这种质量转移的确切性质是质量、晕定义、红移和更大范围环境的复杂函数，并且取决于模拟中实现的重子物理的具体情况。我们提出了需要应用于每个 DMO 晕目录的修正公式，以便重现在其流体动力学对应物中发现的 HMF。此外，我们探讨了这种 HMF 差异对环境的依赖性，并发现在大多数情况下，低密度环境中的光环比高密度环境中的光环受重子物理的影响稍大一些。因此，我们还提供了依赖于环境的质量校正公式，可以重现条件 HMF 以及全局 HMF。我们表明，我们的质量校正也可以修复大规模的光晕聚集，尽管需要环境相关的校正才能达到高于 2% 的精度。最后，我们研究了重子物理对晕质量浓度关系的影响，发现其在流体动力学模拟中的斜率与 DMO 模拟中的斜率一致。最终，我们建议未来任何依赖 DMO 光环目录的工作都纳入我们的质量修正，以测试其结果对重子效应的稳健性。
We examine the impact of baryonic physics on the halo distribution in hydrodynamic simulations compared to that in dark matter–only (DMO) simulations. We find that, in general, DMO simulations produce halo mass functions (HMFs) that are shifted to higher halo masses than their hydrodynamic counterparts due to the lack of baryonic physics. However, the exact nature of this mass shift is a complex function of mass, halo definition, redshift, and larger-scale environment, and it depends on the specifics of the baryonic physics implemented in the simulation. We present fitting formulae for the corrections one would need to apply to each DMO halo catalog in order to reproduce the HMF found in its hydrodynamic counterpart. Additionally, we explore the dependence on environment of this HMF discrepancy and find that, in most cases, halos in low-density environments are slightly more impacted by baryonic physics than halos in high-density environments. We thus also provide environment-dependent mass correction formulae that can reproduce the conditional, as well as global, HMF. We show that our mass corrections also repair the large-scale clustering of halos, though the environment-dependent corrections are required to achieve an accuracy better than 2%. Finally, we examine the impact of baryonic physics on the halo mass–concentration relation and find that its slope in hydrodynamic simulations is consistent with that in DMO simulations. Ultimately, we recommend that any future work relying on DMO halo catalogs incorporate our mass corrections to test the robustness of their results to baryonic effects.