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C. Borys (Caltech), A. Pope, D. Scott (University of British Columbia), C. Conselice (Caltech), M. Dickinson (NOAO/STScI), B. Mobasher (STScI)
We present a new sub-mm `Super-map' in the GOODS-North field, containing 40 statistically robust sources at 850 microns. This map contains new data, and several new sources. We have used the ACS HST images and ground-based near-IR observations from GOODS, along with deep radio observations, to develop a systematic approach for counterpart identification. With the depth achieved by this survey, optical counterparts have been found for all the radio-detected sub-mm sources. We have used the colours, morphologies and photometric redshifts of these secure identifications to help identify counterparts to the radio-undetected sources, finding that certain combinations of optical properties can be used to successfully identify the counterpart to a sub-mm source. 74 per cent of our sources have a unique optical counterpart using our new techniques for counterpart identification, and an additional 18 per cent have more than one possibility that meet our criteria in the ACS images. We have found a much higher ERO rate than other sub-mm surveys, due to the increased depth in the optical images. The median photometric redshift (and quartile range), from optical and near-infrared data, is 1.7 (1.3-2.3) for the radio-detected sub-mm sources, and rises to 2.3 (1.3-2.9) for the radio-undetected sub-sample. We find interesting correlations between the 850 micron flux and both the i magnitude, and the photometric redshift from which there appears to be an absence of high redshift faint counterparts to the lower flux density SCUBA sources. While the quantitative morphologies span a range of values, in general the sub-mm galaxies show larger sizes and a higher degree of asymmetry than other galaxy populations at the same redshifts. Recently, we have been using the deep Spitzer IRAC and MIPS images to study these sub-mm galaxies in the infrared.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.