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

Yoshiki Toba, Takuji Yamashita, Tohru Nagao, Wei Hao Wang, Yoshihiro Ueda, Kohei Ichikawa, Toshihiro Kawaguchi, Masayuki Akiyama, Bau Ching Hsieh, Masaru Kajisawa, Chien Hsiu Lee, Yoshiki Matsuoka, Akatoki Noboriguchi, Masafusa Onoue, Malte Schramm, Masayuki Tanaka, Yutaka Komiyama

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number15
JournalAstrophysical Journal, Supplement Series
Volume243
Issue number1
DOIs
Publication statusPublished - 2019

Keywords

  • catalogs
  • infrared: galaxies
  • methods: observational
  • methods: statistical
  • radio continuum: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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