Extinction-free Census of AGNs in the $AKARI$/IRC North Ecliptic Pole
  Field from 23-band Infrared Photometry from Space Telescopes
  In order to understand the interaction between the central black hole and the
whole galaxy or their co-evolution history along with cosmic time, a complete
census of active galactic nuclei (AGN) is crucial. However, AGNs are often
missed in optical, UV and soft X-ray observations since they could be obscured
by gas and dust. A mid-infrared (mid-IR) survey supported by multiwavelength
data is one of the best ways to find obscured AGN activities because it suffers
less from extinction. Previous large IR photometric surveys, e.g., $WISE$ and
$Spitzer$, have gaps between the mid-IR filters. Therefore, star forming galaxy
(SFG)-AGN diagnostics in the mid-IR were limited. The $AKARI$ satellite has a
unique continuous 9-band filter coverage in the near to mid-IR wavelengths. In
this work, we take advantage of the state-of-the-art spectral energy
distribution (SED) modelling software, CIGALE, to find AGNs in mid-IR. We found
126 AGNs in the NEP-Wide field with this method. We also investigate the energy
released from the AGN as a fraction of the total IR luminosity of a galaxy. We
found that the AGN contribution is larger at higher redshifts for a given IR
luminosity. With the upcoming deep IR surveys, e.g., $JWST$, we expect to find
more AGNs with our method.
