Discovery of an Extremely Luminous Dust-obscured Galaxy Observed with SDSS, WISE, JCMT, and SMA

Abstract

We present the discovery of an extremely luminous dust-obscured galaxy (DOG) at z spec  = 3.703, WISE J101326.25+611220.1. This DOG is selected as a candidate of extremely luminous infrared (IR) galaxies based on the photometry from the Sloan Digital Sky Survey and Wide-field Infrared Survey Explorer . In order to derive its accurate IR luminosity, we perform follow-up observations at 450 and 850  μ m using the Submillimetre Common User Bolometer Array 2 on the James Clerk Maxwell Telescope, and at 870 and 1300  μ m using the Submillimeter Array, which enable us to pin down its IR Spectral Energy Distribution (SED). We perform SED fitting using 14 photometric data (0.4–1300  μ m) and estimate its IR luminosity, L IR (8–1000  μ m), to be ×10 14 L ☉ , making it one of the most luminous IR galaxies in the universe. The energy contribution from an active galactic nucleus (AGN) to the IR luminosity is %, which indicates that it is an AGN-dominated DOG. On the other hand, its stellar mass ( M * ) and star formation rate (SFR) are = and ) =  , respectively, which means that this DOG can be considered a starburst galaxy in the M * –SFR plane. This extremely luminous DOG shows significant AGN and star-forming activity that provides us with an important laboratory to probe the maximum phase of the coevolution of galaxies and supermassive black holes.