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The Galaxy Evolution Explorer (GALEX) detected ultraviolet emission in about50% of multi-spin early-type galaxies (ETGs), suggesting the occurrence of arecent rejuvenation episode connected to the formation of these kinematicalfeatures. With the aim at investigating the complex evolutionary scenarioleading to the formation of counter rotating ETGs (CR-ETGs) we use our SmoothParticle Hydrodynamic (SPH) code with chemo-photometric implementation. Wediscuss here the UV evolutionary path of two CR-ETGs, NGC 3593 and NGC 5173,concurrently best fitting their global observed properties, i.e., morphology,dynamics, as well as their total B-band absolute magnitude and spectral energydistribution (SED) extended over three orders of magnitude in wavelength. Thesesimulations correspond to our predictions about the target evolution which wefollow in the color-magnitude diagram (CMD), near-UV (NUV) versus r-bandabsolute magnitude, as a powerful diagnostic tool to emphasize rejuvenationepisodes.

The UV window on counter rotating ETGs: insight from SPH simulations with chemo-photometric implementation