Changing Ionization Conditions in SDSS Galaxies with AGN as a Function of Environment from Pairs to Clusters
arXiv:1410.0008 · doi:10.1088/0004-637X/795/1/62
Abstract
We study how AGN activity changes across environments from galaxy pairs to clusters using galaxies with 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]/H, [OIII]/H) 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.
Accepted for publication in ApJ
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