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We analyze the evolution of colour gradients predicted by the hydrodynamicalmodels of early type galaxies (ETGs) in Pipino et al. (2008), which reproducefairly well the chemical abundance pattern and the metallicity gradients oflocal ETGs. We convert the star formation (SF) and metal content into coloursby means of stellar population synthetic model and investigate the role ofdifferent physical ingredients, as the initial gas distribution and content,and eps_SF, i.e. the normalization of SF rate. From the comparison with highredshift data, a full agreement with optical rest-frame observations at z < 1is found, for models with low eps_SF, whereas some discrepancies emerge at 1 <z < 2, despite our models reproduce quite well the data scatter at theseredshifts. To reconcile the prediction of these high eps_SF systems with theshallower colour gradients observed at lower z we suggest intervention of 1-2dry mergers. We suggest that future studies should explore the impact of wetgalaxy mergings, interactions with environment, dust content and a variation ofthe Initial Mass Function from the galactic centers to the peripheries.

Colour gradients of high-redshift Early-Type Galaxies from hydrodynamical monolithic models