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Yoshiki Toba
Kyoto University

SOFIA/HAWC+ view of an extremely luminous infrared galaxy at z = 3.7

We present far-infrared (FIR) properties of an extremely luminous infrared galaxy (ELIRG) at z_spec = 3.703, WISEJ1013+6112. This ELIRG is selected as an IR-bright dust-obscured galaxy (DOG) based on the photometry from the SDSS and WISE. In order to derive its accurate IR luminosity, we perform follow-up observations at 89 and 154 μm using the HAWC+ on board the SOFIA. We conduct SED fitting with CIGALE using 15 photometric data (0.4-1300 μm). We successfully pin down FIR SED of WISEJ1013+6112 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 determine the dust temperature of WISEJ1013+6112 is Tdust = 89 ± 3 K, which is significantly higher than that of other populations such as submillimeter galaxies (SMGs) and FIR-selected galaxies at similar IR luminosities. The resultant dust mass is Mdust = (2.2 ± 0.1) × 10^8 Msun. This indicates that WISEJ1013+6112 has a significant active galactic nucleus and star-forming activity behind a large amount of dust (Toba et al. 2020, ApJ, 889, 76).