Physics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..363s&link_type=abstract
NOAO Proposal ID #2007A-0363
Physics
Scientific paper
Above 1mJy the 1.4GHz source counts are dominated by AGN but below 1mJy there is an excess, hypothesized to be starburst emission. Currently the separate evolution of the AGN and starburst populations is constrained, only weakly, by source count modeling and a few, direct observations. To understand better the faint AGN/starburst population we have made an ultra-deep 610MHz/1.4GHz survey. Many radio sources in our survey are identified as AGN, but a significant fraction are steep spectrum, galaxy-scale sources, and so are likely to be starburst powered. Most of our radio survey is covered with deep X-ray observations. Whilst the radio observations indicate star formation rate, the X-rays tell us mainly about accretion, i.e. black hole growth. Additional discrimination between AGN and starbursts is provided by deep Spitzer IRAC+MIPS photometry. To model the separate evolution of the AGN and starbursts we require redshifts. Here we request GMOS spectroscopy to identify optically faint radio and X-ray sources.
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