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Paper: Clustering, Host Galaxies, and Evolution of AGN
Volume: 408, The Starburst−AGN Connection
Page: 341
Authors: Hickox, R.C.; the Boötes Survey Collaboration
Abstract: We explore the connection between different classes of active galactic nuclei (AGNs) and the evolution of their host galaxies, by deriving host galaxy properties, clustering, and Eddington ratios of AGNs selected in the radio, X-ray, and infrared (IR) wavebands from the wide-field (9 deg2) Boötes survey. We study a sample of 585 AGNs at 0.25 < z < 0.8 using redshifts from the AGN and Galaxy Evolution Survey (AGES). We find that radio and X-ray AGNs reside in relatively large dark matter halos (Mhalo ~ 3 × 1013 and 1013 h−1 Mʘ, respectively) and are found in galaxies with red and “green” colors. In contrast, IR AGNs are in less luminous galaxies, have higher Eddington ratios, and reside in halos with Mhalo < 1012 Mʘ. We interpret these results in terms of a general picture for AGNs and galaxy evolution, in which quasar activity is triggered when Mhalo ~ 1012−1013 Mʘ, after which star formation ceases and AGN accretion shifts to optically-faint, X-ray and radio-bright modes.
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