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Paper: A Redshift Survey of Strongly Lensed Submm Galaxies Based on Molecular Emission Lines Observed with ALMA
Volume: 476, New Trends in Radio Astronomy in the ALMA Era
Page: 33
Authors: Weiß, A.; De Breuck, C.; Vieira, J. D.; Marrone, D. P.; Hezaveh, Y. D.; Chapman, S. C.; SPT-SMG team
Abstract: We present the results of a blind redshift survey in the 3 mm transmission window in a sample of SPT sources using ALMA. This survey is a large success with 45 detected line features which we identify as redshifted emission lines of 12CO, 13CO, CI, H2O and H2O+. At least 60% of our sample is found to be at z > 3 with two sources at z = 5.7 placing them among the most distant SMGs known today. The resulting mean redshift of our sample is bar z = 3.5. This finding is in contrast to the redshift distribution of radio-identified DSFGs, which have a significantly lower mean redshift of bar z = 2.3 and for which only 10-15% of the population is expected to be at z > 3. We discuss the effect of gravitational lensing on the redshift distribution and compare our measured redshift distribution to that of models in the literature.
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