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Published on 19 October 2012
Vol. 548
In section 4. Extragalactic astronomy
Millimeter imaging of submillimeter galaxies in the COSMOS field: redshift distribution
by V. Smolcic, M. Aravena, F. Navarrete, et al., A&A 548, A4
From 27 submillimeter galaxies (SMGs) discovered with low spatial
resolution at 0.9 mm with APEX in the COSMOS field, 18 have been detected
with Plateau de Bure interferometer with a resolution of 1.5” in the
continuum at 1.3mm. These detections show that 15% of these SMGs consist
of multiple sources, almost 70% of the multi-wavelength identifications
made on the single-dish SMGs were correct. The identification of the sources allows one to derive their photometric redshift. The mean redshift found here is slightly higher than in previous samples, and the 1.1mm selected sources have a higher (3.1) mean redshift than the 0.9mm selected sources (2.6). The results also imply a surface density of z>4 SMGs, which is higher than predicted by current cosmological models.