Mass-based structural param. for 3D-HST galaxies

At fixed mass, the star-forming galaxies do not show significant changes in their r20, r50, and r80 sizes, indicating self-similar growth. Only above the pivot stellar mass of log(M_*_/M_{sun}_)~10.5 does r80 evolve as r80{propto}(1+z)^-0.85+/-0.20^, indicating that mass builds up in the outskirts of these systems (inside-out growth). The Sersic values also increase for the massive star-forming galaxies toward late cosmic time.

Massive quiescent galaxies show stronger size evolution at all radii, in particular, the r20 sizes. For these massive galaxies, Sersic values remain almost constant since at least z~1.3, indicating that the strong size evolution is related to the changes in the outer parts of these galaxies. We make all the structural parameters publicly available.