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Title: Changing ionization conditions in SDSS galaxies with active galactic nuclei as a function of environment from pairs to clusters

We study how active galactic nucleus (AGN) activity changes across environments from galaxy pairs to clusters using 143,843 galaxies with z < 0.2 from the Sloan Digital Sky Survey. 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 ([N II] λ6548/Hα, [O III] λ5007/Hβ) 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.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. California Institute of Technology, 1200 East-California Boulevard, Pasadena, CA 91125 (United States)
  2. Kavli Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa-Shi, Chiba 277-8583 (Japan)
  3. Department of Physics and Astronomy, University of Victoria, Finnerty Road, Victoria, British Columbia, V8P 1A1 (Canada)
  4. Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching (Germany)
  5. Department of Physics and Astronomy, Trent University, 1600 West Bank Drive, Peterborough, Ontario, K9J 7B8 (Canada)
Publication Date:
OSTI Identifier:
22370290
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 795; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AVAILABILITY; BLACK HOLES; ELEMENT ABUNDANCE; EMISSION; GALAXIES; GALAXY CLUSTERS; GALAXY NUCLEI; PAIRING INTERACTIONS; STAR ACCRETION