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We derive stellar masses, ages and star formation histories of massiveearly-type galaxies in the z=1.237 RDCS1252.9-2927 cluster and compare themwith those measured in a similarly mass-selected sample of field contemporariesdrawn from the GOODS South Field. Robust estimates of these parameters areobtained by comparing a large grid of composite stellar population models with8-9 band photometry in the rest-frame NUV, optical and IR, thus sampling theentire relevant domain of emission of the different stellar populations.Additionally, we present new, deep $U$-band photometry of both fields, givingaccess to the critical FUV rest-frame, in order to constrain empirically thedependence on the environment of the most recent star formation processes. Wefind that early-type galaxies, both in the cluster and in the field, showanalogous optical morphologies, follow comparable mass vs. size relation, havecongruent average surface stellar mass densities and lie on the same Kormendyrelation. We also that a fraction of early-type galaxies in the field employlonger timescales, $\tau$, to assemble their mass than their clustercontemporaries. Hence we conclude that, while the formation epoch of early-typeonly depends on their mass, the environment does regulate the timescales oftheir star formation histories. Our deep $U$-band imaging strongly supportsthis conclusions. It shows that cluster galaxies are at least 0.5 mag fainterthan their field contemporaries of similar mass and optical-to-infrared colors,implying that the last episode of star formation must have happened morerecently in the field than in the cluster.

astrophysical journal/the astrophysical journal

Formation epochs, star formation histories and sizes of massive  early-type galaxies in cluster and field environments at z=1.2: insights from  the rest-frame UV