Stellar halos in ETGs from deep imaging and integral field spectroscopy.

The study of galaxies stellar halos and diffuse intracluster light, historically hampered by the faintness of these components, has been fostered by the advent of deep imaging surveys, which allow to study faint features and galaxiey structures out to their outskirts. In this context, the VST Early-type GAlaxies Survey (VEGAS) is producing competitive results. Therefore, taking advantage of the deep VST images, we can address the build up history of the stellar halo by comparing the surface brightness profile and the stellar mass fraction with the prediction of cosmological galaxy formation. The deep observations can be directly compared with the predictions from the up-to-date theories for the stellar halo formation and the relation with the galaxy environment. Moreover, by combining extended deep imaging and integral-field spectroscopy we can simultaneously map the structure, kinematics, and population properties of the central in situ and outer ex situ stellar galaxies' components. In this talk I will show the results of studies of galaxies' stellar halos perfomed by using both VST deep images and MUSE integral field spectra.