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
  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 of
the 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 compiled
multi-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, star
formation rate (SFR), IR luminosity, the ratio of IR and radio luminosity
($q_{\rm IR}$), and radio spectral index ($\alpha_{\rm radio}$) that are
derived from the SED fitting with CIGALE. We also estimated Eddington ratio
based on stellar mass and integration of the best-fit SEDs of AGN component. We
found that $E (B-V)_{*}$, SFR, and IR luminosity clearly depend on redshift
while stellar mass, $q_{\rm IR}$, and $\alpha_{\rm radio}$ do not significantly
depend on redshift. Since optically-faint ($i_{\rm AB} \geq 21.3$) RGs that are
newly discovered by our RG survey tend to be high redshift, they tend to not
only have a large dust extinction and low stellar mass but also have high SFR
and AGN luminosity, high IR luminosity, and high Eddington ratio compared to
optically-bright ones. The physical properties of a fraction of RGs in our
sample 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 and
FIRST provides us curious RGs among entire RG population.
