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The relationships between galaxies of intermediate stellar mass and moderateluminosity active galactic nuclei (AGNs) at 1<z<3 are investigated with theGalaxy Mass Assembly ultra-deep Spectroscopic Survey (GMASS) samplecomplemented with public data in the GOODS-South field. Using X-ray data,hidden AGNs are identified in unsuspected star-forming galaxies with noapparent signs of non-stellar activity. In the color-mass plane, two paralleltrends emerge during the ~2 Gyr between the average redshifts z~2.2 and z~1.3:while the red sequence becomes significantly more populated by ellipticals, themajority of AGNs with L(2-10 keV)>10^42.3 erg s^-1 disappear from the bluecloud/green valley where they were hosted predominantly by star-forming systemswith disk and irregular morphologies. These results are even clearer when therest-frame colors are corrected for dust reddening. At z~2.2, the ultravioletspectra of active galaxies (including two Type 1 AGNs) show possible gasoutflows with velocities up to about -500 km s^-1 that are not observed neitherin inactive systems at the same redshift, nor at lower redshifts. Such outflowsindicate the presence of gas that can move faster than the escape velocities ofactive galaxies. These results suggest that feedback from moderately luminousAGNs (logL_X<44.5 erg s^-1) played a key role at z>~2 by contributing tooutflows capable of ejecting part of the interstellar medium and leading to arapid decrease in the star formation in host galaxies with stellar masses10<logM<11 M_Sun.

AGN feedback at z~2 and the mutual evolution of active and inactive galaxies