The study of the galaxy stellar mass function and in particular its dependence from the environment represents a key observable to discriminate between different models of galaxy evolution. We determined the stellar mass function (SMF) of passive and star-forming (SF) galaxies in different regions of two clusters in the CLASH-VLT sample MACS J1206.2-0847 and Abell 209. Since these two clusters are at different redshifts the comparison between the results obtained in the two cases can inform us about the evolution of the SMF with cosmic time.
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