Radio Identification of Sub-mm Sources in the Hubble Deep Field
arXiv:astro-ph/9811098 · doi:10.1086/311905
Abstract
Determination of the epoch dependent star-formation rate of field galaxies is one of the principal goals of modern observational cosmology. Recently, Hughes et al. (1998) using the SCUBA instrument on the James Clerk Maxwell Telescope, report the detection of a new population of heavily dust enshrouded, star-forming galaxies at high redshifts (z > 2), dramatically altering the picture of galaxy evolution. However, we show that this interpretation must be treated with caution because of ambiguities in the identification of the host galaxies. Based on our deep, high resolution 1.4 GHz obervations of the Hubble Deep Field, we suggest alternate identifications to the sub-mm detections. These identifications argue for a substantially lower redshift to the sub-mm population with a consequential lowering of the z > 2 sub-mm/far infrared luminosity density and global star-formation rate.
13 pages, 5 figures, 1 table, submitted to ApJ, new radio images available at http://www.cv.nrao.edu/~jkempner/vla-hdf/
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