Detection of an Ultra-bright Submillimeter Galaxy behind the Small Magellanic Cloud
Tamura, Yoichi; Kohno, Kotaro; Yun, Min S.; Kawabe, Ryohei; Kawamura, Akiko; Fukui, Yasuo; Onishi, Toshikazu; Komugi, Shinya; Oogi, Taira; Wilson, Grant W.; Hughes, David H.; Aretxaga, Itziar; Scott, Kimberly S.; Matsuo, Hiroshi; Takekoshi, Tatsuya; Sorai, Kazuo; Minamidani, Tetsuhiro; Mizuno, Norikazu; Austermann, Jason E.; Tosaki, Tomoka; Muller, Erik; Habe, Asao; Ezawa, Hajime; Oshima, Tai
Japan, United States, Chile, Mexico
Abstract
We report the discovery of a new ultra-bright submillimeter galaxy (SMG) behind the Small Magellanic Cloud (SMC). This SMG is detected as a 43.3 ± 8.4 mJy point source (MM J01071-7302, hereafter MMJ0107) in the 1.1 mm continuum survey of the SMC by AzTEC on the ASTE telescope. MMJ0107 is also detected in the radio (843 MHz), Herschel/SPIRE, Spitzer MIPS 24 μm, all IRAC bands, Wide-field Infrared Survey Explorer, and near-infrared (J, H, KS ). We find an optical (U, B, V) source, which might be the lensing object, at a distance of 1.''4 from near-infrared and IRAC sources. Photometric redshift estimates for the SMG using representative spectral energy distribution templates show the redshifts of 1.4-3.9. We estimate total far-infrared luminosity of (0.3-2.2) × 1014 μ-1 L ⊙ and a star formation rate of 5600-39, 000 μ-1 M ⊙ yr-1, where μ is the gravitational magnification factor. This apparent extreme star formation activity is likely explained by a highly magnified gravitational lens system.
Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.