Detection of an ultra-bright submillimeter galaxy in the Subaru/XMM-Newton Deep Field using AzTEC/ASTE - INSPIRE

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Detection of an ultra-bright submillimeter galaxy in the Subaru/XMM-Newton Deep Field using AzTEC/ASTE

Sep, 2010

17 pages

Published in:

Mon.Not.Roy.Astron.Soc. 415 (2011) 3081

e-Print:

1009.1455 [astro-ph.CO]

DOI:

10.1111/j.1365-2966.2011.18918.x

View in:

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Abstract: (arXiv)

We report the detection of an extremely bright (

\sim

37 mJy at 1100

\mu

m and

\sim

91 mJy at 880

\mu

m) submillimeter galaxy (SMG), AzTEC-ASTE-SXDF1100.001 (hereafter referred to as SXDF1100.001 or Orochi), discovered in 1100

\mu

m observations of the Subaru/XMM-Newton Deep Field using AzTEC on ASTE. Subsequent CARMA 1300

\mu

m and SMA 880

\mu

m observations successfully pinpoint the location of Orochi and suggest that it has two components, one extended (FWHM of

\sim

4

^{\prime\prime}

) 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 are found. The derived upper limit to the line-to-continuum flux ratio is 0.1--0.3 (2

\sigma

) 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 \sim 3.4

behind a foreground, optically visible (but red) galaxy at

z \sim 1.4

. The deduced apparent (i.e., no correction for magnification) infrared luminosity (

L_{\rm IR}

) and star formation rate (SFR) are

6 \times 10^{13}

L_{\odot}

and 11000

M_{\odot}

yr

^{-1}

, respectively, assuming that the

L_{\rm IR}

is dominated by star formation. These values suggest that Orochi will consume its gas reservoir within a short time scale (

3 \times 10^{7}

yr), which is indeed comparable to those in extreme starbursts like the centres of local ULIRGs.

Note:

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