SIMBAD references

We study the rest-frame ultraviolet (UV) sizes of massive () galaxies at, selected from the FourStar Galaxy Evolution Survey, by fitting single Sérsic profiles to Hubble Space Telescope/WFC3/F160W images from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. Massive quiescent galaxies are very compact, with a median circularized half-light radius kpc. Removing (31%) sources with signs of active galactic nucleus activity does not change the result. Star-forming galaxies have kpc, larger than quiescent galaxies. Quiescent galaxies at are on average smaller than at and smaller than at. Star-forming galaxies of the same stellar mass are smaller than at. Overall, the size evolution at is well described by a power law, with kpc for quiescent galaxies and kpc for star-forming galaxies. Compact star-forming galaxies are rare in our sample: we find only (7%) with, whereas (81%) of the quiescent galaxies are compact. The number density of compact quiescent galaxies at is and increases rapidly, by, between. The paucity of compact star-forming galaxies at and their large rest-frame UV median sizes suggest that the formation phase of compact cores is very short and/or highly dust obscured.