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Quasar feedback in the form of powerful outflows is invoked as a keymechanism to quench star formation in galaxies, preventing massive galaxies toover-grow and producing the red colors of ellipticals. On the other hand, somemodels are also requiring `positive' AGN feedback, inducing star formation inthe host galaxy through enhanced gas pressure in the interstellar medium.However, finding observational evidence of the effects of both types offeedback is still one of the main challenges of extragalactic astronomy, as fewobservations of energetic and extended radiatively-driven winds are available.Here we present SINFONI near infrared integral field spectroscopy of XID2028,an obscured, radio-quiet z=1.59 QSO detected in the XMM-COSMOS survey, in whichwe clearly resolve a fast (1500 km/s) and extended (up to 13 kpc from the blackhole) outflow in the [OIII] lines emitting gas, whose large velocity andoutflow rate are not sustainable by star formation only. The narrow componentof Ha emission and the rest frame U band flux from HST-ACS imaging enable tomap the current star formation in the host galaxy: both tracers independentlyshow that the outflow position lies in the center of an empty cavity surroundedby star forming regions on its edge. The outflow is therefore removing the gasfrom the host galaxy (`negative feedback'), but also triggering star formationby outflow induced pressure at the edges (`positive feedback'). XID2028represents the first example of a host galaxy showing both types of feedbacksimultaneously at work.

Blowin' in the wind: both `negative' and `positive' feedback in an obscured high-z Quasar