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arXiv · 1012.0305

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

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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Abstract

We present radio and infrared (3.6-24um) counterparts to submillimetre galaxies (SMGs) detected in the Extended Chandra Deep Field South with the LABOCA 870-um bolometer camera on the 12-m Atacama Pathfinder Experiment. Using the Very Large Array at 1.4GHz and Spitzer we have identified secure counterparts to 79 of the 126 SMGs (SNR>3.7, S_870>4.4mJy) in the field, 62 via their radio and/or 24-um emission, the remainder using a colour-flux cut on IRAC 3.6- and 5.8-um sources chosen to maximise the number of secure, coincident radio and 24-um 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 z=2.2 (+0.7-0.8) (1-sigma errors) for the secure radio counterparts, in agreement with other studies, both spectroscopic and photometric.

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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. 2010-12-01. The LABOCA survey of the Extended Chandra Deep Field South - radio and mid-infrared counterparts to submillimetre galaxies. https://doi.org/10.1111/j.1365-2966.2010.18132.x

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