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The LABOCA survey of the Extended Chandra Deep Field-South - radio and mid-infrared counterparts to submillimetre galaxies

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  • A. D. Biggs
  • R. J. Ivison
  • E. Ibar
  • J. L. Wardlow
  • H. Dannerbauer
  • Ian Smail
  • F. Walter
  • A. Weiß
  • S. C. Chapman
  • K. E. K. Coppin
  • C. De Breuck
  • M. Dickinson
  • K. K. Knudsen
  • V. Mainieri
  • K. Menten
  • C. Papovich
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<mark>Journal publication date</mark>1/06/2011
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number4
Volume413
Pages (from-to)2314-2338
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We present radio and infrared (3.6-24 μm) counterparts to submillimetre galaxies (SMGs) detected in the Extended Chandra Deep Field-South with the Large APEX Bolometer Camera (LABOCA) 870-μm bolometer camera on the 12-m Atacama Pathfinder Experiment. Using the Very Large Array at 1.4 GHz and Spitzer, we have identified secure counterparts to 79 of the 126 SMGs [signal-to-noise ratio (S/N) > 3.7, S870 > 4.4 mJy] in the field, 62 via their radio and/or 24-μm emission, the remainder using a colour-flux cut on Infrared Array Camera 3.6- and 5.8-μm sources chosen to maximize the number of secure, coincident radio and 24-μm counterparts. In constructing our radio catalogue, we have corrected for the effects of 'flux boosting', then used the corrected flux densities to estimate the redshifts of the SMGs based on the radio/submm spectral indices. The effect of the boosting correction is to increase the median redshift by 0.2 resulting in a value of ? (1σ errors) for the secure radio counterparts, in agreement with other studies, both spectroscopic and photometric.