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Preprint typeset using L ATEX style emulateapj v. 04/03/99 A REDSHIFT SURVEY OF THE SUBMILLIMETER GALAXY POPULATION

By S. C. Chapman, A. W. Blain, Ian Smail and R. J. Ivison

Abstract

We have obtained spectroscopic redshifts using the Keck-I telescope for a sample of 73 submillimeter (submm) galaxies, with a median 850 µm flux density of 5.7mJy, for which precise positions are available through their faint radio emission. The galaxies lie at redshifts out to z = 3.6, with a median redshift of 2.2 and an interquartile range z = 1.7–2.8. Modeling a purely submm flux-limited sample, based on the expected selection function for our radio-identified sample, suggests a median redshift of 2.3 with a redshift distribution remarkably similar to the optically- and radio-selected Quasars. The observed redshift distributions are similar for the AGN and starburst sub-samples. The median RAB=24.6 for the sample. However, the dust-corrected ultraviolet (UV) luminosities of the galaxies rarely hint at their huge bolometric luminosities indicated by their radio/submm emission, underestimating the true luminosity by a median factor of ∼ 100 for SMGs with pure starburst spectra. Radio and submm observations are thus essential to select the most luminous, high-redshift galaxies. The 850 µm, radio, and redshift data is used to estimate the dust temperatures, and characterize photometric redshifts. Using 450 µm measurements for a subset of our sample we confirm that the median dust temperature of Td=36±7K, derived assuming the local FIR–radio correlation applies at high redshift, is reasonable. Individual 450 µm detections ar

Year: 2004
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