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Abstract

Dependence of AGN fraction for AKARI NEPW galaxies on redshift and infrared luminosity

Nagisa Oi (Tokyo University of Science)

In 2014 and 2015, we took deep optical imaging data in five broad-bands (g, r, i, z, and y) covering almost the entire AKARI NEP-Wide field using the Subaru/Hyper Suprime-Cam. The deep optical data enabled us to estimate the redshifts of more than 70,000 AKARI infrared sources.  Using SED models based on nearby galaxies, we classified the AKARI infrared galaxies into four categories: quiescent, star-forming, Type1-AGN, and Type2-AGN. We considered the galaxies classified as Type1-AGN and Type2-AGN as AGN hosts, and examined the dependence of the fraction of AGN hosts (fAGN) on redshift and infrared luminosity (LIR).  We found that fAGN tends to increase rapidly with increasing redshift over the entire range of log(LIR) = 11-14 L_sun. On the other hand, the dependence on LIR was found to be slight at low-z and almost constant at high-z.

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