Title: Color gradients in field and cluster ETGs at z~1.4: constraining their 
radial metallicity and age variation.

Abstract: We present a study of colour gradients in a sample of elliptical 
galaxies at z~1.4. The sample is composed of 20 field ellipticals and 20 
cluster ellipticals. We detect in all of them radial variations of the UV-U and 
U-R restframe colour showing evidence of multiple stellar components.  While we 
found negative U-R colour gradients both in field and in cluster ellipticals, 
UV-U color gradients are almost always positive with the few exceptions only 
among field ellipticals.
We found that the observed colour gradients cannot be accounted for by a pure 
radial variation of stellar population metallicity. On the contrary, the 
analysis performed shows the presence of at least two main stellar components 
characterized by both a different age and a different metallicity with the 
younger (DeltaAge ~ 2Gyr) component contributing for less than 10% to the total 
stellar mass.
Independent analysis based on integrated spectral indeces confirm this result 
showing evidence of multiple stellar components in elliptical galaxies at this 
redshift.