星系团和星系团附近的星系演化：抛射的卫星和环境猝灭的空间范围
Galaxy evolution near groups and clusters: ejected satellites and the spatial extent of environmental quenching
摘要：
星系团的维里半径超过几个集团/集群优先静态恒星形成率。利用斯隆数字巡天的星系群/星系团目录，再加上宇宙学的N体模拟，我们研究了超越维里半径的这种环境淬火的起源。占集群的群体/集群，我们表明，中央星系显示出增强的SFR淬火到2.5维里半径超出群体/集群，我们表明，这种扩展的环境增强可以简单地解释为“弹出”卫星星系的轨道超出其主机晕的维里半径。我们发现，弹射卫星通常轨道几个陀螺仪超出维里半径，然后回落，因此，他们组成了40%的所有中心星系附近的集团/集群。我们表明，一个模型中，弹射卫星经历相同的SFR淬火卫星内的主机晕基本上可以解释所有的环境依赖的星系淬火。此外，被抛出的卫星（继续）失去显著的晕质量，这种效应可能通过引力透镜观察到。喷射卫星的SFR/颜色和恒星到晕质量突出了环境历史的重要性，并对忽略这种历史的星系占领模型提出了挑战。
英文摘要：
Galaxies that are several virial radii beyond groups/clusters show preferentially quiescent star formation rates. Using a galaxy group/cluster catalog from the Sloan Digital Sky Survey, together with a cosmological N-body simulation, we examine the origin of this environmental quenching beyond the virial radius. Accounting for the clustering of groups/clusters, we show that central galaxies show enhanced SFR quenching out to 2.5 virial radii beyond groups/clusters, and we demonstrate that this extended environmental enhancement can be explained simply by 'ejected' satellite galaxies that orbit beyond their host halo's virial radius. We show that ejected satellites typically orbit for several Gyr beyond the virial radius before falling back in, and thus they compose up to 40% of all central galaxies near groups/clusters. We show that a model in which ejected satellites experience the same SFR quenching as satellites within a host halo can explain essentially all environmental dependence of galaxy quenching. Furthermore, ejected satellites (continue to) lose significant halo mass, an effect that is potentially observable via gravitational lensing. The SFRs/colors and stellar-to-halo masses of ejected satellites highlight the importance of environmental history and present challenges to models of galaxy occupation that ignore such history.
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