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The sub-mJy radio population is a mixture of active systems, that is starforming galaxies (SFGs) and active galactic nuclei (AGNs). We study a sample of883 radio sources detected at 1.4 GHz in a deep Very Large Array survey of theExtended Chandra Deep Field South (E-CDFS) that reaches a best rms sensitivityof 6 microJy. We have used a simple scheme to disentangle SFGs, radio-quiet(RQ), and radio-loud (RL) AGNs based on the combination of radio data withChandra X-ray data and mid-infrared observations from Spitzer. We find that atflux densities between about 30 and 100 microJy the radio population isdominated by SFGs (~60%) and that RQ AGNs become increasingly important over RLones below 100 microJy. We also compare the host galaxy properties of the threeclasses in terms of morphology, optical colours and stellar masses. Our resultsshow that both SFG and RQ AGN host galaxies have blue colours and late typemorphology while RL AGNs tend to be hosted in massive red galaxies with earlytype morphology. This supports the hypothesis that radio emission in SFGs andRQ AGNs mainly comes from the same physical process: star formation in the hostgalaxy.

The sub-mJy radio sky in the Extended Chandra Deep Field South: source population