We present a statistical analysis of different astrophysical properties of a sample of galaxy pairs in cosmic voids. The sample consists of 72 galaxy pairs with projected separations and relative radial velocities rp<100 h$^{-1}$kpc, $ΔV <$ 500 kms$^{-1}$ in the redshift range z<0.1. The different results for this pair sample are compared to those derived for matched samples configured in absolute magnitude, stellar mass and concentration residing in void wall and global averaged environments. We find that pair galaxies in voids tend to have bluer optical colors than the corresponding galaxies in wall an field, regardless of their stellar mass and concentration, which indicates a more recent formation of the bulk of stars. We also obtain larger mid--IR colors for the void paired galaxies with respect to the corresponding matched samples in the wall and in field environments. However, we find significantly larger differences for galaxies with high mass and concentration. We also notice that mid--IR color--color diagram shows void pair members consistent with the locus of star--forming galaxies, in contrast with the other environments that exhibit a bimodal behavior comprising both passive and star--forming objects. The D$_n$(4000) parameter also shows a significant younger stellar population in paired galaxies in voids. This is also reflected in the higher star formation rate values, which show a larger efficiency for void paired galaxies. We notice that the star formation efficiency is larger for void paired galaxies with high stellar mass and concentration. We also find that the efficiency of star formation associated to galaxy interactions is significantly larger in pairs residing in cosmic voids. This larger star formation activity could be associated to both the expected richer gas environment and a more gentle dynamical behavior typical of void environments.
我们从斯隆数字巡天数据发布16（SDSS DR 16）的调查，也从千年模拟提取空目录。我们的重点是我们的比较分布的星系比$M_r < -18$内部的空洞和研究的平均间隔的空洞星系，距离空洞中心，和径向密度分布。我们发现，空洞星系的平均分离取决于空洞的大小，因为较大的空洞有较低的平均分离在两个样本。然而，在观察样本中的空洞星系似乎有更大的平均距离比模拟的任何给定的空洞大小。此外，观察到的空洞星系往往比模拟中的更靠近空洞中心。这种差异也表现在空隙的密度分布中。无论孔隙大小如何，真实孔隙分布的中心密度都高于预测模拟目录中的中心密度。
CSST large-scale structure analysis pipeline: IV. Cosmic Voids Identified from Galaxy Group Samples as Probes of the Large-scale Structure
Shanghai Jiao Tong University（上海交通大学）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；University of Chinese Academy of Sciences(UCAS)（中国科学院大学）
Quantifying Environmental Effects on Galaxy Properties using Non-spherical Voids Identified from SDSS DR7
Shanghai Jiao Tong University（上海交通大学）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；University of Chinese Academy of Sciences（中国科学院大学）
