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We analyze the recent released HST/WFC3 IR images in the GOODS-N region tostudy the formation and evolution of Quiescent galaxies (QGs). After examiningthe reliability with artificial galaxies, we obtain the morphologicalparameters with S'ersic profile of 299 QGs and 1,083 star-forming galaxies(SFGs) at z ~ 0.5-3.0, finding the evolution of re and n of massive (M* >10^10.5 Msun) QGs while weaker evolution of SFGs and less massive (M* < 10^10.5Msun) QGs. The regression of the size evolution of massive QGs follows re\propto (1 + z)-{\alpha}re with {\alpha}re = 1.06 \pm 0.19 (a factor of ~ 2.2increase from z ~ 2.5 to ~ 0.5), which is consistent with the general pictureof the significant size growth. For the further understanding of the evolutionscenario, we study the evolution of S'ersic index, n, and find that of massiveQGs to significantly evolve as n \propto (1 + z)-{\alpha}n with {\alpha}n =0.74 \pm 0.23 (n ~ 1 at z ~ 2.5 to n ~ 4 at z ~ 0.5), while those of the otherpopulations are unchanged (n ~ 1) over the redshift range. The results in thepresent study are consistent with both of observation and numericalsimulations, where gas-poor minor merger is believed to be the main evolutionscenario. By taking account of the connection with less massive QGs and SFGs,we discuss the formation and evolution of the massive QGs over "Cosmic HighNoon", or the peak of star-formation in the universe.

The evolution of galaxy size and morphology at z~0.5-3.0 in the GOODS-N region with HST/WFC3 data