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Abstract: We explore the connection between different classes of active galactic nucleiAGNs and the evolution of their host galaxies, by deriving host galaxyproperties, clustering, and Eddington ratios of AGNs selected in the radio,X-ray, and infrared IR wavebands from the wide-field 9 deg^2 Bootes survey.We study a sample of 585 AGNs at 0.25 < z < 0.8 using redshifts from the AGNand Galaxy Evolution Survey AGES. We find that radio and X-ray AGNs reside inrelatively large dark matter halos M halo ~ 3x10^13 and 10^13 h^-1 M sun,respectively and are found in galaxies with red and -green- colors. Incontrast, IR AGNs are in less luminous galaxies, have higher Eddington ratios,and reside in halos with M halo < 10^12 M sun. We interpret these results interms of a general picture for AGNs and galaxy evolution, in which quasaractivity is triggered when M halo ~ 10^12 - 10^13 M sun, after which starformation ceases and AGN accretion shifts to optically-faint, X-ray andradio-bright modes.



Author: Ryan C. Hickox Harvard-Smithsonian CfA, the Bootes survey collaboration

Source: https://arxiv.org/







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