标题： 改变SDSS星系中AGN的电离条件随环境从双星系到星团的变化 显示英文标题

标题： Changing Ionization Conditions in SDSS Galaxies with AGN as a Function of Environment from Pairs to Clusters

摘要： 我们研究了活动星系核（AGN）活动如何随着环境从星系对到星团的变化而变化，使用了来自斯隆数字巡天（SDSS）的$143\, 843$个星系，其中有$z<0.2$。通过一种改进的技术，我们应用了一种连续测量 AGN 活动的方法，该方法反映了窄线发射气体的电离状态特征。 不同样本间关键发射线比率（[NII]$\lambda6548$/H$\alpha$，[OIII]$\lambda5007$/H$\beta$）的变化使我们能够区分不同的环境效应，同时去除污染。 我们证实，星系相互作用会增强 AGN 活动。然而，在星团中心区域的条件下，即使星系成对存在，也不利于 AGN 活动。 这些结果可以通过气体动力学模型来解释，在该模型中，成对相互作用刺激气体向星系核转移，而星团则抑制了供吸积到中心黑洞的气体可用性。 显示英文摘要

摘要： We study how AGN activity changes across environments from galaxy pairs to clusters using $143\, 843$ galaxies with $z<0.2$ from the Sloan Digital Sky Survey (SDSS). Using a refined technique, we apply a continuous measure of AGN activity, characteristic of the ionization state of the narrow-line emitting gas. Changes in key emission-line ratios ([NII]$\lambda6548$/H$\alpha$, [OIII]$\lambda5007$/H$\beta$) between different samples allow us to disentangle different environmental effects while removing contamination. We confirm that galaxy interactions enhance AGN activity. However, conditions in the central regions of clusters are inhospitable for AGN activity even if galaxies are in pairs. These results can be explained through models of gas dynamics in which pair interactions stimulate the transfer of gas to the nucleus and clusters suppress gas availability for accretion onto the central black hole.