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- Title
Does AGN fraction depend on redshift or luminosity? An extinction-free test by 18-band near- to mid-infrared SED fitting in the AKARI NEP wide field.
- Authors
Chiang, Chia-Ying; Goto, Tomotsugu; Hashimoto, Tetsuya; Kim, Seong Jin; Matsuhara, Hideo; Oi, Nagisa
- Abstract
Revealing what fraction of galaxies harbor active galactic nuclei (AGNs) is central to understanding the black hole accretion history of the universe. However, optical and soft X-ray surveys miss the most highly obscured AGNs. Infrared (IR), instead, is more robust against absorption. Previous IR photometric surveys, however, only had four or five filters in mid-IR. Our AKARI North Ecliptic Pole wide field sample has 18 filters in mid-IR (nine from AKARI, four from WISE, and five from Spitzer), for the first time allowing a sophisticated mid-IR spectral energy distribution (SED) fitting diagnosis for a statistical number of sources (89178 over 5.4 deg2). By using an SED fitting technique, we investigated the evolution of AGN fraction as a function of redshift and IR (8–1000 μm) luminosity in an extinction-free way. We found that the AGN fraction (FAGN) shows no sign of strong redshift evolution. Instead, FAGN increases with increasing IR luminosity in all redshift bins (0 < |$z$| < 2).
- Subjects
STELLAR luminosity function; PHYSICAL cosmology; ACTIVE galactic nuclei; SPECTRAL energy distribution; LUMINOSITY; ACTIVE galaxies
- Publication
Publications of the Astronomical Society of Japan, 2019, Vol 71, Issue 2, pN.PAG
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psz012