Extinction-free Census of AGNs in the AKARI/IRC North Ecliptic Pole Field from 23-band Infrared Photometry from Space Telescopes

Wang, Ting-Wen; Goto, Tomotsugu; Kim, Seong Jin; Hashimoto, Tetsuya; Burgarella, Denis; Toba, Yoshiki; Shim, Hyunjin; Miyaji, Takamitsu; Hwang, Ho Seong; Jeong, Woong-Seob; Kim, Eunbin; Ikeda, Hiroyuki; Pearson, Chris; Malkan, Matthew; Oi, Nagisa; Santos, Daryl Joe D; Małek, Katarzyna; Pollo, Agnieszka; Ho, Simon C-C; Matsuhara, Hideo; On, Alvina Y L; Kim, Helen K; Hsiao, Tiger Yu-Yang and Huang, Ting-Chi (2020). Extinction-free Census of AGNs in the AKARI/IRC North Ecliptic Pole Field from 23-band Infrared Photometry from Space Telescopes. Monthly Notices of the Royal Astronomical Society (Early access).

DOI: https://doi.org/10.1093/mnras/staa2988

Abstract

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.

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