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Paper: Radio and Optical Properties of the Faint Radio Population
Volume: 373, The Central Engine of Active Galactic Nuclei
Page: 738
Authors: Gregorini, L.; Prandoni, I.; Mignano, A.; Parma, P.; de Ruiter, H.R.; Wieringa, M.H.; Vettolani, G.; Ekers, R.D.
Abstract: We used the Australia Telescope Compact Array (ATCA) to follow-up at 5 GHz part of the region previously covered by the sub-mJy ATESP 1.4 GHz survey. We imaged a one-square degree area where extensive UBVRIJKs deep imaging is available through the multicolor ESO Deep Public Survey. The 1.4 and 5 GHz information allowed us to study the radio spectral properties of the ATESP radio sources. We found a significant flattening of the 1.45 GHz spectral indices going to fainter flux. Such a flattening is consistent with a flattening for the 5 GHz source counts occuring at fluxes ≤ 0.5 mJy. We then used the optical information available to assess the nature of the ATESP sub-mJy sources and the physical processes responsible for such a flattening. Preliminary results indicate that flat/inverted sources are more probably triggered by nuclear activity than by star formation.
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