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We perform a detailed analysis of the resolved colors and stellar populationsof a complete sample of 323 star-forming galaxies at 0.5 < z < 1.5, and 326star-forming galaxies at 1.5 < z < 2.5 in the ERS and CANDELS-Deep region ofGOODS-South. Galaxies were selected to be more massive than 10^10 Msun and havespecific star formation rates above 1/t_H. We model the 7-band optical ACS +near-IR WFC3 spectral energy distributions of individual bins of pixels,accounting simultaneously for the galaxy-integrated photometric constraintsavailable over a longer wavelength range. We analyze variations in rest-framecolor, stellar surface mass density, age, and extinction as a function ofgalactocentric radius and local surface brightness/density, and measurestructural parameters on luminosity and stellar mass maps. We find evidence forredder colors, older stellar ages, and increased dust extinction in the nucleiof galaxies. Big star-forming clumps seen in star formation tracers are lessprominent or even invisible on the inferred stellar mass distributions.Off-center clumps contribute up to ~20% to the integrated SFR, but only 7% orless to the integrated mass of all massive star-forming galaxies at z ~ 1 and z~ 2, with the fractional contributions being a decreasing function ofwavelength used to select the clumps. The stellar mass profiles tend to havesmaller sizes and M20 coefficients, and higher concentration and Ginicoefficients than the light distribution. Our results are consistent with aninside-out disk growth scenario with brief (100 - 200 Myr) episodic localenhancements in star formation superposed on the underlying disk.Alternatively, the young ages of off-center clumps may signal inward clumpmigration, provided this happens efficiently on the order of an orbitaltimescale.

Smooth(er) Stellar Mass Maps in CANDELS: Constraints on the Longevity of Clumps in High-redshift Star-forming Galaxies