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In order to investigate the FIR properties of radio-active AGN, we haveconsidered three different fields where both radio and FIR observations are thedeepest to-date: GOODS-South, GOODS-North and the Lockman Hole. Out of a totalof 92 radio-selected AGN, ~64% are found to have a counterpart in Herschelmaps. The percentage is maximum in the GOODS-North (72%) and minimum (~50%) inthe Lockman Hole, where FIR observations are shallower. Our study shows that inall cases FIR emission is associated to star-forming activity within the hostgalaxy. Such an activity can even be extremely intense, with star-forming ratesas high as ~10^3-10^4 Msun/yr. AGN activity does not inhibit star formation inthe host galaxy, just as on-site star-formation does not seem to affect AGNproperties, at least those detected at radio wavelengths and for z>~1.Furthermore, physical properties such as the mass and age distributions of thegalaxies hosting a radio-active AGN do not seem to be affected by the presenceof an ongoing star-forming event. Given the very high rate of FIR detections,we stress that this refers to the majority of the sample: most radio-active AGNare associated with intense episodes of star-formation. However, the twoprocesses proceed independently within the same galaxy, at all redshifts but inthe local universe, where powerful enough radio activity reaches the necessarystrength to switch off the on-site star formation. Our data also show that forz>~1 the hosts of radio-selected star-forming galaxies and AGN areindistinguishable from each other both in terms of mass and IR luminositydistributions. The two populations only differentiate in the very localuniverse, whereby the few AGN which are still FIR-active are found in galaxieswith much higher masses and luminosities.

The PEP Survey: evidence for intense star-forming activity in the majority of radio-selected AGN at z>~1