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arXiv 1707.09002astro-ph.GA
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ELUCID IV:星系淬灭及其与晕质量、环境和装配偏差的关系

ELUCID IV: Galaxy Quenching and its Relation to Halo Mass, Environment, and Assembly Bias

Huiyuan Wang, H. J. Mo, Sihan Chen, Yang Yang, Xiaohu Yang, Enci Wang, Frank C. van den Bosch, Yipeng Jing, Xi Kang, Weipeng Lin, S. H. Lim, Shuiyao Huang, Yi L… 展开作者

Huiyuan Wang, H. J. Mo, Sihan Chen, Yang Yang, Xiaohu Yang, Enci Wang, Frank C. van den Bosch, Yipeng Jing, Xi Kang, Weipeng Lin, S. H. Lim, Shuiyao Huang, Yi Lu, Shijie Li, Weiguang Cui, Youcai Zhang, Dylan Tweed, Chengliang Wei, Guoliang Li, Feng Shi

摘要:

我们研究了中心星系和卫星星系的淬火分数作为星系恒星质量,晕质量和大尺度环境的物质密度的函数。物质密度推断,从我们的ELUCID模拟,一个受约束的模拟本地宇宙采样SDSS,而晕质量和中央/卫星分类采取从星系群目录杨等人。淬火分数的总人口增加系统的三个数量。我们发现,“环境淬火效率”,量化的淬火分数作为晕质量的函数,是独立的恒星质量。而这种独立性就是先前研究中发现的基于密度的猝灭效率与恒星质量无关的起源。分别考虑中心和卫星,我们发现,这两个群体遵循类似的淬火效率与晕质量和恒星质量的相关性,这表明他们经历了类似的淬火过程中,他们的主机晕。我们表明,卫星淬火单独不能占总星系人口的环境淬火效率和两个人口之间的差异,发现以前主要是由于这样一个事实,即中心和卫星的相同的恒星质量居住,平均而言,在不同的质量晕。在去除这些晕质量和恒星质量效应之后,仍然存在对环境密度的微弱但显著的残余依赖,当考虑到晕组装偏差时,这种依赖被消除。因此,我们的研究结果表明,晕质量是主要的环境参数,调节淬火的中心和卫星。

英文摘要:

We examine the quenched fraction of central and satellite galaxies as a function of galaxy stellar mass, halo mass, and the matter density of their large scale environment. Matter densities are inferred from our ELUCID simulation, a constrained simulation of local Universe sampled by SDSS, while halo masses and central/satellite classification are taken from the galaxy group catalog of Yang et al. The quenched fraction for the total population increases systematically with the three quantities. We find that the `environmental quenching efficiency', which quantifies the quenched fraction as function of halo mass, is independent of stellar mass. And this independence is the origin of the stellar mass-independence of density-based quenching efficiency, found in previous studies. Considering centrals and satellites separately, we find that the two populations follow similar correlations of quenching efficiency with halo mass and stellar mass, suggesting that they have experienced similar quenching processes in their host halo. We demonstrate that satellite quenching alone cannot account for the environmental quenching efficiency of the total galaxy population and the difference between the two populations found previously mainly arises from the fact that centrals and satellites of the same stellar mass reside, on average, in halos of different mass. After removing these halo-mass and stellar-mass effects, there remains a weak, but significant, residual dependence on environmental density, which is eliminated when halo assembly bias is taken into account. Our results therefore indicate that halo mass is the prime environmental parameter that regulates the quenching of both centrals and satellites.

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