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The Role of Host Galaxy for the Environmental Dependence of Active Nuclei in Local Galaxies

Davies, RI and Hicks, EKS and Erwin, P and Burtscher, L and Contursi, A and Genzel, R and Janssen, A and Koss, M and Lin, M-Y and Lutz, D and Maciejewski, W and Müller-Sánchez, F and Orban de Xivry, G and Ricci, C and Riffel, R and Riffel, RA and Rosario, D and Schartmann, M and Schnorr-Müller, A and Shimizu, T and Sternberg, A and Sturm, E and Storchi-Bergmann, T and Tacconi, L and Veilleux, S (2017) The Role of Host Galaxy for the Environmental Dependence of Active Nuclei in Local Galaxies. Monthly Notices of the Royal Astronomical Society, 466 (4). pp. 4917-4927. ISSN 0035-8711

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Abstract

We discuss the environment of local hard X-ray selected active galaxies, with reference to two independent group catalogues. We find that the fraction of these AGN in S0 host galaxies decreases strongly as a function of galaxy group size (halo mass) – which contrasts with the increasing fraction of galaxies of S0 type in denser environments. However, there is no evidence for an environmental dependence of AGN in spiral galaxies. Because most AGN are found in spiral galaxies, this dilutes the signature of environmental dependence for the population as a whole. We argue that the differing results for AGN in disc-dominated and bulge-dominated galaxies are related to the source of the gas fuelling the AGN, and so may also impact the luminosity function, duty cycle and obscuration. We find that there is a significant difference in the luminosity function for AGN in spiral and S0 galaxies, and tentative evidence for some difference in the fraction of obscured AGN.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 06 Jun 2017 11:43
Last Modified: 11 Sep 2017 11:41
DOI or Identification number: 10.1093/mnras/stx045
URI: http://researchonline.ljmu.ac.uk/id/eprint/6648

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