Oral Presentation

Far-infrared View of an Extremely Luminous Infrared Galaxy at z = 3.7

Author(s): Yoshiki Toba (Kyoto Univ./ASIAA), Wei-Hao Wang (ASIAA), Tohru Nagao (Ehime Univ.), Yoshihiro Ueda (Kyoto Univ.), Junko Ueda (NAOJ), Chen-Fatt Lim (NTU), Yu-Yen Chang (ASIAA), Toshiki Saito (MPIA) , Ryohei Kawabe (NAOJ)

Presenter: Yoshiki Toba (Kyoto University/ASIAA)

We present far-infrared (FIR) properties of an extremely luminous IR galaxy (ELIRG) at zspec = 3.703 (WISE1013). This ELIRG is selected as an IR-bright dust- obscured galaxy (DOG) based on the photometry from the Sloan Digital Sky Survey (SDSS) and Wide-field Infrared Survey Explorer (WISE). In order to derive its accurate IR luminosity, we perform follow-up observations at 89 and 154 μm using the High-resolution Airborne Wideband Camera-plus (HAWC+) on board the 2.7-m Stratospheric Observatory For Infrared Astronomy (SOFIA) telescope. We conduct spectral energy distribution (SED) fitting with CIGALE using 15 photometric data (0.4-1300 μm). We successfully pin down FIR SED of WISE1013 and its IR luminosity is estimated to be LIR = (1.62 ± 0.08) ×10^14 Lsun, making it one of the most luminous IR galaxies in the universe. We found that dust temperature of WISE1013 is Tdust = 89.4 ± 2.7 K that is significantly higher than that of other populations such as SMGs and FIR-selected galaxies at similar IR luminosity, indicating that WISE1013 has a significant AGN and star-forming activity behind a large amount of dust (Toba et al. 2019d, to be submitted).