TY - JOUR
T1 - 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
AU - Toba, Yoshiki
AU - Yamashita, Takuji
AU - Nagao, Tohru
AU - Wang, Wei Hao
AU - Ueda, Yoshihiro
AU - Ichikawa, Kohei
AU - Kawaguchi, Toshihiro
AU - Akiyama, Masayuki
AU - Hsieh, Bau Ching
AU - Kajisawa, Masaru
AU - Lee, Chien Hsiu
AU - Matsuoka, Yoshiki
AU - Noboriguchi, Akatoki
AU - Onoue, Masafusa
AU - Schramm, Malte
AU - Tanaka, Masayuki
AU - Komiyama, Yutaka
N1 - Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved.
PY - 2019
Y1 - 2019
N2 - We present physical properties of radio galaxies (RGs) with f 1.4 GHz > 1 mJy discovered by Subaru Hyper Suprime-Cam (HSC) and Very Large Array Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey. For 1056 FIRST RGs at 0 < z ≤ 1.7 with HSC counterparts in about 100 deg2, 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 IR), and radio spectral index (α radio) that are derived from the spectral energy distribution (SED) fitting with CIGALE. We also estimated Eddington ratio based on stellar mass and integration of the best-fit SEDs of active galactic nucleus (AGN) component. We found that E(B - V)∗, SFR, and IR luminosity clearly depend on redshift while stellar mass, q IR, and α radio do not significantly depend on redshift. Since optically faint (i AB ≥ 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 with 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.
AB - We present physical properties of radio galaxies (RGs) with f 1.4 GHz > 1 mJy discovered by Subaru Hyper Suprime-Cam (HSC) and Very Large Array Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey. For 1056 FIRST RGs at 0 < z ≤ 1.7 with HSC counterparts in about 100 deg2, 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 IR), and radio spectral index (α radio) that are derived from the spectral energy distribution (SED) fitting with CIGALE. We also estimated Eddington ratio based on stellar mass and integration of the best-fit SEDs of active galactic nucleus (AGN) component. We found that E(B - V)∗, SFR, and IR luminosity clearly depend on redshift while stellar mass, q IR, and α radio do not significantly depend on redshift. Since optically faint (i AB ≥ 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 with 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.
KW - catalogs
KW - infrared: galaxies
KW - methods: observational
KW - methods: statistical
KW - radio continuum: galaxies
UR - http://www.scopus.com/inward/record.url?scp=85071244732&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85071244732&partnerID=8YFLogxK
U2 - 10.3847/1538-4365/ab238d
DO - 10.3847/1538-4365/ab238d
M3 - Article
AN - SCOPUS:85071244732
VL - 243
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
SN - 0067-0049
IS - 1
M1 - 15
ER -