AzTEC millimetre survey of the COSMOS field - I. Data reduction and source catalogue

作者：Scott K S^*; Austermann J E; Perera T A; Wilson G W; Aretxaga I; Bock J J; Hughes D H; Kang Y; Kim S; Mauskopf P D; Sanders D B; Scoville N; Yun M S

来源：Monthly Notices of the Royal Astronomical Society, 2008, 385(4): 2225-2238.

DOI：10.1111/j.1365-2966.2008.12989.x

• galaxies : high-redshift
• galaxies : starburst
• submillimetre

We present a 1.1 mm wavelength imaging survey covering 0.3 deg(2) 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 approximate to 0.73. A total of 50 mm-galaxy candidates, with a significance ranging from 3.5 to 8.5 sigma, are extracted from the central 0.15 deg(2) area which has a uniform sensitivity of similar to 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 x 10(12) L-circle dot and star formation rates > 1100 M-circle dot 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-mu m data and radio data with this AzTEC map of the COSMOS field.

• 出版日期2008-4-21