恒星形成猝灭与星系内部性质和环境的关系
The Correlation of Star Formation Quenching with Internal Galaxy Properties and Environment
摘要：
我们研究了恒星形成猝灭与星系内部性质和大尺度环境（晕质量）的关系。我们利用了杨和合作者基于光环的星表，这是基于斯隆数字巡天。星系演化探测器（GALEX）的数据也被用来提取最近的恒星形成率。为了研究环境效应，我们分别研究了“中心”星系和“卫星”星系的性质。对于中心星系，我们无法断定恒星形成猝灭主要与晕质量或恒星质量有关，因为这两个量本身是密切相关的。对于卫星星系，几乎同样强烈的依赖晕质量和恒星质量。我们做了同样的比较五个不同的半解析模型的基础上三个独立开发的代码。我们发现，AGN反馈的模型再现合理以及中央红星系和被动星系的晕质量和恒星质量的分数的依赖。然而，对于卫星星系，同样的模型严重过度产生的红色/被动星系的比例，并没有再现与恒星质量或晕质量的经验趋势。这个{ \em卫星过淬问题}是由卫星热气晕的过快剥离引起的，这导致了恒星形成的快速扼杀。
英文摘要：
We investigate the correlation of star formation quenching with internal galaxy properties and large scale environment (halo mass) in empirical data and theoretical models. We make use of the halo-based Group Catalog of Yang and collaborators, which is based on the Sloan Digital Sky Survey. Data from the Galaxy Evolution Explorer (GALEX) are also used to extract the recent star formation rate. In order to investigate the environmental effects, we examine the properties of "central" and "satellite" galaxies separately. For central galaxies, we are unable to conclude whether star formation quenching is primarily connected with halo mass or stellar mass, because these two quantities are themselves strongly correlated. For satellite galaxies, a nearly equally strong dependence on halo mass and stellar mass is seen. We make the same comparison for five different semi-analytic models based on three independently developed codes. We find that the models with AGN feedback reproduce reasonably well the dependence of the fraction of central red and passive galaxies on halo mass and stellar mass. However, for satellite galaxies, the same models badly overproduce the fraction of red/passive galaxies and do not reproduce the empirical trends with stellar mass or halo mass. This {\em satellite overquenching problem} is caused by the too-rapid stripping of the satellites' hot gas halos, which leads to rapid strangulation of star formation.
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