AGN and Starburst Galaxies Seen through Radio Surveys
L. Gregorini, I. Prandoni, H. R. de Ruiter, P. Parma, G. Vettolani, A. Zanichelli, M. H. Wieringa, R. D. Ekers
Abstract
The emergence of a new population of radio galaxies at mJy and sub-mJy levels is responsible for the change in the slope of the radio source counts. This population seems to include both star forming galaxies and classical (AGN-powered) radio sources, but the relative importance of the two classes is still debated. We present results from the ATESP radio survey and its optical follow-up and show that the fraction of starburst galaxies changes from ~15% at fluxes >1 mJy to >50% at lower fluxes.
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