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AzTEC millimetre survey of the COSMOS field – I. Data reduction and source catalogue
Scott, K. S. Austermann, J. E. Perera, Thushara A. Wilson, Graham Wallace Aretxaga, I. Bock, J. J. Hughes, D. H. Kang, Y. Kim, S. Mauskopf, P. D.
Scott, K. S.
Austermann, J. E.
Perera, Thushara A.
Wilson, Graham Wallace
Aretxaga, I.
Bock, J. J.
Hughes, D. H.
Kang, Y.
Kim, S.
Mauskopf, P. D.
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Abstract
We present a 1.1 mm wavelength imaging survey covering 0.3 deg2 in the COSMOS field. These data, obtained with the AzTEC continuum camera on the James Clerk Maxwell Telescope, were centred on a prominent large-scale structure overdensity which includes a rich X-ray cluster at z≈ 0.73. A total of 50 mm-galaxy candidates, with a significance ranging from 3.5 to 8.5σ, are extracted from the central 0.15 deg2 area which has a uniform sensitivity of ∼1.3 mJy beam−1. 16 sources are detected with S/N ≥ 4.5, where the expected false-detection rate is zero, of which a surprisingly large number (9) have intrinsic (deboosted) fluxes ≥5 mJy at 1.1 mm. Assuming the emission is dominated by radiation from dust, heated by a massive population of young, optically obscured stars, then these bright AzTEC sources have far-infrared luminosities >6 × 1012L⊙ and star formation rates >1100 M⊙ yr−1. Two of these nine bright AzTEC sources are found towards the extreme peripheral region of the X-ray cluster, whilst the remainder are distributed across the larger scale overdensity. We describe the AzTEC data reduction pipeline, the source-extraction algorithm, and the characterization of the source catalogue, including the completeness, flux deboosting correction, false-detection rate and the source positional uncertainty, through an extensive set of Monte Carlo simulations. We conclude with a preliminary comparison, via a stacked analysis, of the overlapping MIPS 24-μm data and radio data with this AzTEC map of the COSMOS field.
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This is the publisher's version, also available electronically from http://mnras.oxfordjournals.org/content/385/4/2225. This article has been accepted for publication in Monthly Notices Of The Royal Astronomical Society ©: 2008 K. S. Scott et al. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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2008-04-21
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Oxford University Press
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Scott, K. S. et al. (2008). "AzTEC millimetre survey of the COSMOS field – I. Data reduction and source catalogue." Monthly Notices Of The Royal Astronomical Society, 385(4):2225-2238. http://www.dx.doi.org/10.1111/j.1365-2966.2008.12989.x.