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We study the evolution of the number density, as a function of the size, ofpassive early-type galaxies with a wide range of stellar masses10^10<M*/Msun<10^11.5) from z~3 to z~1, exploiting the unique dataset availablein the GOODS-South field, including the recently obtained WFC3 images as a partof the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey(CANDELS). In particular, we select a sample of 107 massive (M*>10^10 M_sun),passive (SSFR<10^-2 Gyr^-1) and morphologically spheroidal galaxies at 1.2<z<3,taking advantage of the panchromatic dataset available for GOODS, includingVLT, CFHT, Spitzer, Chandra and HST ACS+WFC3 data. We find that at 1<z<3 thepassively evolving early-type galaxies are the reddest and most massive objectsin the Universe, and we prove that a correlation between mass, morphology,color and star-formation activity is already in place at that epoch. We measurea significant evolution in the mass-size relation of passive early-typegalaxies (ETGs) from z~3 to z~1, with galaxies growing on average by a factorof 2 in size in a 3 Gyr timescale only. We witness also an increase in thenumber density of passive ETGs of 50 times over the same time interval. We findthat the first ETGs to form at z>2 are all compact or ultra-compact, whilenormal sized ETGs (meaning ETGs with sizes comparable to those of localcounterparts of the same mass) are the most common ETGs only at z<1. Theincrease of the average size of ETGs at 0<z<1 is primarily driven by theappearance of new large ETGs rather than by the size increase of individualgalaxies.

Constraining The Assembly Of Normal And Compact Passively Evolving Galaxies From Redshift z=3 To The Present With CANDELS