论文标题
集群郊区的各向异性中心
Anisotropic infall in the outskirst of clusters
论文作者
论文摘要
我们通过估计红色银河系的分数来分析星系的恒星形成淬灭与红移范围$ z = [0,2] $中簇的位置之间的连接。更具体地说，我们专注于从与细丝并列的星系中插入各向同性的星系。我们使用从应用于Multidark Simulation应用的星系形成的半分析模型获得的星系样本。 {\ textsc {mdpl2}}。与观察结果一致，我们发现进口区域显示了恒星形成水平，这些恒星形成中间存在于星团和田间中的星系中。 此外，我们表明，在红移范围[0-0.85]中，丝状区域的恒星形成比各向同性输入区域更强。我们还研究了红星系的比例，这是与群集中心的归一化距离的函数，发现，对于半径$ r_ {200}> 3 $，丝状区域中红星系的比例大大比各向同性输入区域大得多。从$ z = 0 $的星系主要祖细胞的性质分析中，我们发现它们具有不同的进化行为，具体取决于恒星的质量和环境。我们的结果证实了观察性发现，表明集群的插座区域在大多数星系的进化史的星系进行预处理中起着重要作用。
We analyse the connection between the star formation quenching of galaxies and their location in theoutskirts of clusters in the redshift range $z=[0,2]$ by estimating the fraction of red galaxies. More specifically, we focus on galaxies that infall isotropically from those that are infalling alongside filaments. We use a sample of galaxies obtained from the semi-analytic model of galaxy formation SAG applied to the MultiDark simulation. {\textsc{mdpl2}}. In agreement with observational results, we find that the infall regions show levels of star formation that are intermediate between those of galaxies in clusters and in the field. Moreover, we show that, in the redshift range [0-0.85], the quenching of the star formation is stronger in the filamentary region than in the isotropic infall region. We also study the fraction of red galaxies as a function of the normalised distance to the cluster centre and find that, for radii $R/R_{200}> 3 $, the fraction of red galaxies in the filamentary region is considerably larger than in the isotropic infall region. From the analysis of properties of the main progenitors of galaxies identified at $z = 0$, we find that they have different evolutionary behaviours depending on the stellar mass and environment. Our results confirm the observational findings that suggest that the infall regions of clusters play an important role in the pre-processing of galaxies along most of the evolutionary history of galaxies.
