Modeling the evolution of sub-mm luminous galaxies

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Scientific paper

We have demonstrated that optically faint radio sources (OFRS) can be used to quickly detect a large population of sub-mm luminous, high redshift galaxies. We have now detected 30 OFRS in the sub-mm from a volume-limited sample in the extended HDF, and an additional 10 OFRS in two other fields, where the existing radio detections provide crude redshift estimates through the far-IR/radio correlation. Although biased by the radio pre-selection, we recover the bulk of bright sub-mm source counts, and are able to characterize our selection function through Monte Carlo simulations. We have used these simulations to compare a modeled color-magnitude diagram (S850μ m/S1.4GHz versus S850μ m) to that constructed from our large sample of OFRS. This model comparison provides initial constraints on an evolving luminosity function and redshift distribution for the sources. Future observations are planned with JCMT/SCUBA to observe a much larger sample of OFRS in order to increase our statistics, and push to deeper limits to broaden the luminosity baseline.

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