15-20 March 2020
Europe/Berlin timezone

eFEDS view of WISE 22 $\mu$m-selected galaxies/AGNs collaborated with Subaru Hyper Suprime-Cam

18 Mar 2020, 10:15


Oral Presentation AGN and their host galaxies


Dr Yoshiki Toba (Kyoto University)


We present physical properties (e.g., X-ray luminosity and hardness ratio) of WISE 22 $\mu$m-selected galaxies/AGNs. Using a latest eFEDS X-ray point source catalog with optical and mid-infrared (IR) counterparts, we made a sub-sample of 2102 objects with S/N (22 $\mu$m) > 5.0. After removing possible stars, we cross-identified with KiDS, VIKING (near-IR), and H-ATLAS (far-IR) catalogs, which yielded 268 objects at $0 < z < 2.5$ in $\sim$50 deg$^2$. Photometric redshift of some objects are estimated based on the Hyper Suprime-Cam on the Subaru telescope. We derived their stellar mass, star formation rate (SFR), AGN 6 $\mu$m luminosity ($L_{\rm 6}^{\rm AGN}$), and IR luminosity ($L_{\rm IR}$) based on spectral energy distribution fitting with CIGALE. We also estimated their 2-10 keV luminosity ($L_{\rm X}$) and hardness ratio (HR). We found that about 20% of objects are expected to be hyperluminous IR galaxies with $L_{\rm IR}$ > 10$^{13}$ $L_{\odot}$. Their stellar mass-SFR relation would suggest that they have an active star-formation regardless of their redshift. We confirmed a tight correlation between $L_{\rm 6}^{\rm AGN}$ and $L_{\rm X}$, and about 15% of objects are expected to be moderately obscured population with hydrogen column density ($N_{\rm H}$) > 10$^{23}$ cm$^{-2}$, which is roughly consistent with what is inferred from HR.

Presenter status External collaborator (Subaru Hyper Suprime-Cam)

Primary author

Dr Yoshiki Toba (Kyoto University)


Dr Mara Salvato (MPE) Dr Marcella Brusa (DIFA - University of Bologna) Prof. Masayuki Akiyama (Tohoku University) Dr Andy Goulding (Princeton University) Dr Kohei Ichikawa (Tohoku University) Dr Toshihiro Kawaguchi (Onomichi City University) Prof. Kotaro Kohno (The University of Tokyo) Dr Andrea Merloni Prof. Tohru Nagao (Ehime University) Dr Hyewon Suh (NAOJ) Prof. Yuichi Terashima (Ehime University) Dr Yoshihiro Ueda (Kyoto University) Dr Tanya Urrutia (Leibniz Institut für Astrophysik, Potsdam)

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