We have used deep 1.4GHz VLA observations of the ECDFS (rms~6 microJy) to study the sub-mJy radio source population. The sub-mJy radio sky is a complex mix of star-forming galaxies and radio quiet AGN, with a declining radio-loud AGN component. We find convincing evidence that the radio emission in radio-quiet AGN is related to star-formation rather than to emission from the central SMBH. These results have important implication for future radio surveys, including those with the SKA.á 

X-ray imaging has been the primary tool I have used to study AGNs. During my PhD thesis I have used deep XMM-Newton observations in the Lockman Hole and later 1Ms-2Ms-4Ms-(7Ms) Chandra observation in the CDF-S. In COSMOS I have used both XMM and Chandra imaging of the 2 square degree area.á 

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AGN feedback (either radiative or mechanical) is largelyá used in numerical and semi-analytical simulations of galaxiesá evolution. Although There is mounting evidence that AGN outflows areá ubiquitous, observational proofs of theá impact that such AGN-driven outflows have on their host galaxies are still largely missing. This is one of my main research interests at the moment, and I am using FIR photometry (Herschel), IFU observations (SINFONI/VLT), sub-mm interferometry (PdBI and ALMA).á