Detection of an ultrabright submillimetre galaxy in the Subaru/XMM-NewtonDeep Fieldusing AzTEC/ASTE

S. Ikarashi, K. Kohno, J. E. Aguirre, I. Aretxaga, V. Arumugam, J. E. Austermann, J. J. Bock, C. M. Bradford, M. Cirasuolo, L. Earle, H. Ezawa, H. Furusawa, J. Furusawa, J. Glenn, B. Hatsukade, D. H. Hughes, D. Iono, R. J. Ivison, S. Johnson, J. KamenetzkyR. Kawabe, R. Lupu, P. Maloney, H. Matsuhara, P. D. Mauskopf, K. Motohara, E. J. Murphy, K. Nakajima, K. Nakanishi, B. J. Naylor, H. T. Nguyen, T. A. Perera, K. S. Scott, K. Shimasaku, T. Takagi, T. Takata, Y. Tamura, K. Tanaka, T. Tsukagoshi, D. J. Wilner, G. W. Wilson, M. S. Yun, J. Zmuidzinas

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32 Citations (Scopus)

Abstract

We report on the detection of an extremely bright (~37mJy at 1100μm and ~91mJy at 880μm) submillimetre galaxy (SMG), AzTEC-ASTE-SXDF1100.001 (hereafter referred to as SXDF1100.001 or Orochi), discovered in the 1100μm observations of the Subaru/XMM-NewtonDeep Fieldusing AzTEC on ASTE. Subsequent CARMA 1300-μm and SMA 880-μm observations successfully pinpoint the location of Orochi and suggest that it has two components, one extended [full width at half-maximum (FWHM) of ~4arcsec] and one compact (unresolved). Z-Spec on CSO has also been used to obtain a wide-band spectrum from 190 to 308GHz, although no significant emission/absorption lines were found. The derived upper limit to the line-to-continuum flux ratio is 0.1-0.3 (2σ) across the Z-Spec band. Based on the analysis of the derived spectral energy distribution from optical to radio wavelengths of possible counterparts near the SMA/CARMA peak position, we suggest that Orochi is a lensed, optically dark SMG lying atz~ 3.4 behind a foreground, optically visible (but red) galaxy atz~ 1.4. The deduced apparent (i.e., no correction for magnification) infrared luminosity (LIR) and star formation rate (SFR) are 6 × 1013L and 11000 Myr-1, respectively, assuming that theLIR is dominated by star formation. These values suggest that Orochi will consume its gas reservoir within a short time-scale (3 × 107yr), which is indeed comparable to those in extreme starbursts like the centres of local ultraluminous infrared galaxies (ULIRGs).

Original languageEnglish
Pages (from-to)3081-3096
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume415
Issue number4
DOIs
Publication statusPublished - 2011 Aug

Keywords

  • Galaxies: ISM
  • Galaxies: high-redshift
  • Galaxies: starburst
  • Submillimetre: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Ikarashi, S., Kohno, K., Aguirre, J. E., Aretxaga, I., Arumugam, V., Austermann, J. E., Bock, J. J., Bradford, C. M., Cirasuolo, M., Earle, L., Ezawa, H., Furusawa, H., Furusawa, J., Glenn, J., Hatsukade, B., Hughes, D. H., Iono, D., Ivison, R. J., Johnson, S., ... Zmuidzinas, J. (2011). Detection of an ultrabright submillimetre galaxy in the Subaru/XMM-NewtonDeep Fieldusing AzTEC/ASTE. Monthly Notices of the Royal Astronomical Society, 415(4), 3081-3096. https://doi.org/10.1111/j.1365-2966.2011.18918.x