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arXiv 1804.05064astro-ph.GAastro-ph.CO
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FABLE模拟:星系、星系群和星系团的反馈模型

The FABLE simulations: A feedback model for galaxies, groups and clusters

Nicholas A. Henden, Ewald Puchwein, Sijing Shen, Debora Sijacki

摘要:

我们提出了反馈作用于重子在大尺度环境(FABLE)的宇宙学流体动力学模拟的星系,集团和集群套件。模拟使用的AREPO移动网格代码与一组物理模型的星系形成的基础上成功的插图模拟,但与更新的活动星系核和超新星反馈模型。这使我们能够同时再现观测到的星系恒星质量函数的红移演化,以及恒星和气体的质量分数的本地团体和集群在广泛的晕质量。专注于组和集群的属性,我们发现非常好的协议与一系列观察到的标度关系,包括X射线光度-总质量和气体质量的关系,以及总质量-温度和Sunyaev-Zel'dovich通量-质量的关系。仔细比较我们的结果与基于X射线流体静力学质量的标度关系,而不是弱透镜导出的质量揭示了一些差异,这暗示了在观察到的样品中不可忽略的X射线质量偏差。我们进一步表明,模拟的团内介质的密度,压力和温度的径向分布是非常好的协议与观测,特别是$r > 0.3\ r_{500}$。然而,在最里面的区域,我们发现太大的熵的核心,这表明,一个更复杂的模拟活动星系核反馈的物理可能需要准确地再现所观察到的人口的冷核心和非冷核心集群。

英文摘要:

We present the Feedback Acting on Baryons in Large-scale Environments (FABLE) suite of cosmological hydrodynamical simulations of galaxies, groups and clusters. The simulations use the AREPO moving-mesh code with a set of physical models for galaxy formation based on the successful Illustris simulation, but with updated AGN and supernovae feedback models. This allows us to simultaneously reproduce the observed redshift evolution of the galaxy stellar mass function together with the stellar and gas mass fractions of local groups and clusters across a wide range of halo masses. Focusing on the properties of groups and clusters, we find very good agreement with a range of observed scaling relations, including the X-ray luminosity--total mass and gas mass relations as well as the total mass--temperature and Sunyaev-Zel'dovich flux--mass relations. Careful comparison of our results with scaling relations based on X-ray hydrostatic masses as opposed to weak lensing-derived masses reveals some discrepancies, which hint towards a non-negligible X-ray mass bias in observed samples. We further show that radial profiles of density, pressure and temperature of the simulated intracluster medium are in very good agreement with observations, in particular for $r > 0.3\ r_{500}$. In the innermost regions however we find too large entropy cores, which indicates that a more sophisticated modelling of the physics of AGN feedback may be required to accurately reproduce the observed populations of cool-core and non-cool-core clusters.

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