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Fast and energetic winds are invoked by galaxy formation models as essentialprocesses in the evolution of galaxies. These outflows can be powered either bystar-formation and/or AGN activity, but the relative dominance of the twomechanisms is still under debate. We use spectroscopic stacking analysis tostudy the properties of the low-ionization phase of the outflow in a sample of1330 star-forming galaxies (SFGs) and 79 X-ray detected (42<log(L_X)<45 erg/s)Type 2 AGN at 1.7<z<4.6 selected from a compilation of deep opticalspectroscopic surveys, mostly zCOSMOS-Deep and VUDS. We measure mean velocityoffsets of -150 km/s in the SFGs while in the AGN sample the velocity is muchhigher (-950 km/s), suggesting that the AGN is boosting the outflow up tovelocities that could not be reached only with the star- formationcontribution. The sample of X-ray AGN has on average a lower SFR than non-AGNSFGs of similar mass: this, combined with the enhanced outflow velocity in AGNhosts, is consistent with AGN feedback in action. We further divide our sampleof AGN into two X-ray luminosity bins: we measure the same velocity offsets inboth stacked spectra, at odds with results reported for the highly ionizedphase in local AGN, suggesting that the two phases of the outflow may be mixedonly up to relatively low velocities, while the highest velocities can bereached only by the highly ionized phase.

AGN-enhanced outflows of low-ionization gas in star-forming galaxies at 1.7