The solution to the long-standing problem of radio emission in radio-quiet AGN: star-formation

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Scientific paper

We present the evolutionary properties and luminosity functions of the radio sources belonging to the Chandra Deep Field South VLA survey, which reaches a flux density limit at 1.4~GHz of 42~micro-Jy at the field center and redshift 5, and which includes the first radio-selected complete sample of radio-quiet Active Galactic Nuclei (AGN). We use a new, comprehensive classification scheme based on radio, far-and near-IR, optical, and X-ray data to disentangle star-forming galaxies from AGN and radio-quiet from radio-loud AGN. We confirm our previous result that star-forming galaxies become dominant only below 0.1 mJy. The sub-mJy radio sky turns out to be a complex mix of evolving star-forming galaxies and radio-quiet AGN; non-evolving low-luminosity radio galaxies; and declining radio powerful (P>3x10^24W/Hz) AGN. Our results suggest a very close relationship between star formation and radio emission in radio-quiet AGN, since their radio evolution and luminosity function are respectively indistinguishable from, and an extension of, that of star-forming galaxies. The detection of compact, high brightness temperature cores in several nearby radio-quiet AGN can be explained by the co-existence of two components, one non-evolving and AGN-related and one evolving and star-formation-related.

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