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arXiv 2111.01889astro-ph.COastro-ph.GA
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THREEHUNDRED计划:在星系团尺度上重子过程的影响

The THREEHUNDRED project: the effect of baryon processes at galaxy cluster scale

Weiguang Cui

摘要:

重子模型在流体力学模拟中的作用还不清楚。未来的调查,使用集群统计精确约束宇宙学模型需要更好地理解这一点。利用“三百”计划中不同重子模型(Gadget-MUSIC、Gadget-X和Gizmo-SIMBA)的流体模拟星系团,我们可以看到这个问题的更多细节。我们发现,不同的重子模型引起的星系团质量的变化在百分之几的水平上。然而,质量变化可以是正的或负的,这取决于重子模型。这样一个小的质量变化留下一个微弱的影响(略大于质量变化相比)的累积晕数和微分晕质量函数(HMF)以上的质量完整性。考虑到晕质量的变化,晕质量(或HMF)可以相对于纯暗物质(DMO)运行增加或减少,这取决于重子模型。

英文摘要:

The role of baryon models played in hydrodynamic simulations is still unclear. Future surveys that use cluster statistics to precisely constrain cosmology models require a better understanding of that. With the hydro-simulated galaxy clusters from different baryon models (Gadget-MUSIC, Gadget-X and Gizmo-SIMBA) from the THREEHUNDRED project, we can look into more details of this question. We find that the galaxy cluster mass change due to different baryon models is at a few per cent level. However, the mass changes can be positive or negative, which is depending on the baryon models. Such a small mass change leaves a weak influence (slightly larger compared to the mass changes) on both the cumulative halo numbers and the differential halo mass function (HMF) above the mass completeness. Agreed to the halo mass change, the halo mass (or HMF) can be increased or decreased with respect to the dark-matter-only (DMO) run depending on the baryon models.

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