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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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