Journal Article

Detection of an ultrabright submillimetre galaxy in the Subaru/<i>XMM–Newton</i> <i>Deep Field</i> using 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. Kamenetzky, R. 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 and J. Zmuidzinas

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 4, pages 3081-3096
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18918.x
Detection of an ultrabright submillimetre galaxy in the Subaru/XMM–Newton Deep Field using AzTEC/ASTE

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We report on the detection of an extremely bright (∼37 mJy at 1100 μm and ∼91 mJy at 880 μm) submillimetre galaxy (SMG), AzTEC-ASTE-SXDF1100.001 (hereafter referred to as SXDF1100.001 or Orochi), discovered in the 1100 μm observations of the Subaru/XMM–Newton Deep Field using 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 ∼4 arcsec] and one compact (unresolved). Z-Spec on CSO has also been used to obtain a wide-band spectrum from 190 to 308 GHz, 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 at z ∼ 3.4 behind a foreground, optically visible (but red) galaxy at z ∼ 1.4. The deduced apparent (i.e., no correction for magnification) infrared luminosity (LIR) and star formation rate (SFR) are 6 × 1013 L and 11 000 M yr−1, respectively, assuming that the LIR is dominated by star formation. These values suggest that Orochi will consume its gas reservoir within a short time-scale (3 × 107 yr), which is indeed comparable to those in extreme starbursts like the centres of local ultraluminous infrared galaxies (ULIRGs).

Keywords: galaxies: high-redshift; galaxies: ISM; galaxies: starburst; submillimetre: galaxies

Journal Article.  11500 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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