论文标题
星系群集A2142：光环边界，“红色序列”，根据SDSS的星系的特性
Galaxy cluster A2142: halo boundary, `red sequence', properties of galaxies according to SDSS
论文作者
论文摘要
本文介绍了研究星系的动力学，早期型星系的性能，带有淬灭之星形成（QGS）的星系性能（QGS）的性能，该结果基于Sloan Digital Sky调查的档案数据。我们发现了观察到的光环边界，飞溅半径$ r_ {sp} $，等于4.12 mpc（$ m_r <-20 \，。\！\！\！\！平方距离距中心的功能。我们研究了如何在中心和群集的郊区分布的早期类型星系（$ r/r_ {200} $ <3，$ m_r <-20 \，。\！\！\！ （0.441 \ PM0.005 $）。在所有集群星系中，带有淬火星形的星系（$ -12 \，yr^{ - 1} <\ log ssfr <-10.75 \，yr^{ - 1} $）构成大约三分之一。我们发现，QGS超出splashback $ r_ {sp} $的比例与在同一z处的现场，中心的坐标为$ 16 \，。\！\！\！\！对于具有恒星质量的星系$ \ log m _*/m _ {\ odot} $ = [10.5; 11.0]（这是QGS的主要质量范围），在输入群集后，半径$ r_ {90，r} $减少了大约30 \％，而向中心移动约30 \％。
The paper presents the results of studying the dynamics of galaxies, properties of early-type galaxies, properties of galaxies with the quenched star formation (QGs) in the A 2142 based on the archival data from the Sloan Digital Sky Survey. We found the observed halo boundary, the splashback radius $R_{sp}$, which is equal to 4.12 Mpc ($M_r < -20\,.\!\!^{\rm m}3$) and 4.06 Mpc ($M_r < -21\,.\!\!^{\rm m}3$) over the integral distribution of the number of galaxies as a function of the squared distance from the center. We have studied how early-type galaxies are distributed in the center and in the outskirts of the cluster ($R/R_{200}$ < 3, $M_r < -20\,.\!\!^{\rm m}3$) and plotted the red sequence in the form of (g - r) = $(-0.024\pm0.001)M_r + (0.441\pm0.005$). Among all the cluster galaxies, the galaxies with the quenched star formation ( $- 12\,yr^{- 1} < \log sSFR < - 10.75\,yr^{- 1}$) make up about one third. We have found that the fraction of QGs beyond the splashback $R_{sp}$ is the same as in the field at the same z with coordinates of the center of $16\,.\!\!^{\rm h}5$, $31^{\circ}$ and a size of $300'$. For galaxies with the stellar masses $\log M_*/M_{\odot}$ = [10.5;11.0] (this is the main mass range of QGs), after entering the cluster, there is a decrease in the radii $R_{90,r}$ by about 30\% when moving towards the center.
