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AzTEC Millimetre Survey of the COSMOS Field: I. Data Reduction and Source Catalogue
  • K. S. Scott, University of Massachusetts - Amherst
  • J. E. Austermann, University of Massachusetts - Amherst
  • T. A. Perera, University of Massachusetts - Amherst
  • G. W. Wilson, University of Massachusetts - Amherst
  • I. Aretxaga, 2Instituto Nacional de Astrofisica
  • J. J. Bock, California Institute of Technology
  • D. H. Hughes, 2Instituto Nacional de Astrofisica
  • Y. Kang, Sejong University
  • S. Kim, Sejong University
  • P. D. Mauskopf, Cardiff University
  • D. B. Sanders, University of Hawii
  • N. Scoville, California Institute of Technology
  • Min Yun, University of Massachusetts - Amherst
Publication Date
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 × 1012 L⊙ 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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Citation Information
K. S. Scott, J. E. Austermann, T. A. Perera, G. W. Wilson, et al.. "AzTEC Millimetre Survey of the COSMOS Field: I. Data Reduction and Source Catalogue" MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Vol. 385 Iss. 4 (2008)
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