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We present physical properties of radio galaxies (RGs) with $f_{\rm 1.4 GHz}>$ 1 mJy discovered by Subaru Hyper Supreme-Cam (HSC) and VLA Faint Images ofthe Radio Sky at Twenty-Centimeters (FIRST) survey. For 1056 FIRST RGs at $0 <z \leq 1.7$ with HSC counterparts in about 100 deg$^2$, we compiledmulti-wavelength data of optical, near-infrared (IR), mid-IR, far-IR, and radio(150 MHz). We derived their color excess ($E (B-V)_{*}$), stellar mass, starformation rate (SFR), IR luminosity, the ratio of IR and radio luminosity($q_{\rm IR}$), and radio spectral index ($\alpha_{\rm radio}$) that arederived from the SED fitting with CIGALE. We also estimated Eddington ratiobased on stellar mass and integration of the best-fit SEDs of AGN component. Wefound that $E (B-V)_{*}$, SFR, and IR luminosity clearly depend on redshiftwhile stellar mass, $q_{\rm IR}$, and $\alpha_{\rm radio}$ do not significantlydepend on redshift. Since optically-faint ($i_{\rm AB} \geq 21.3$) RGs that arenewly discovered by our RG survey tend to be high redshift, they tend to notonly have a large dust extinction and low stellar mass but also have high SFRand AGN luminosity, high IR luminosity, and high Eddington ratio compared tooptically-bright ones. The physical properties of a fraction of RGs in oursample seem to differ from a classical view of RGs with massive stellar mass,low SFR, and low Eddington ratio, demonstrating that our RG survey with HSC andFIRST provides us curious RGs among entire RG population.

the astrophysical journal. supplement series/astrophysical journal. supplement series

A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS).  II. Physical Properties derived from the SED Fitting with Optical, Infrared,  and Radio Data