The Differential Assembly History of the Centers and Outskirts of Main-sequence Galaxies at z ∼ 2.3

We present a study of spatially resolved star formation histories (SFHs) for 60 z ∼ 2.3 main-sequence, star-forming galaxies selected from the MOSDEF spectroscopic survey in the GOODS-N field, with median stellar mass log ( M ⋆ / M ⊙ ) = 9.75 and spanning the range 8.6 < log ( M ⋆ / M ⊙ ) < 11.5 . Photometry is decomposed into a central and an outer spatial component using observed z F850LP − H F160W colors. The Prospector code is used to model spectral energy distributions for the center, outskirt, and integrated galaxy using Hubble Space Telescope/ACS and WFC3, Spitzer/IRAC, and ground-based photometry, with additional constraints on gas-phase metallicity and spectroscopic redshift from MOSDEF spectroscopy. For the low-resolution bands, spatially resolved photometry is determined with an iterative approach. The reconstructed SFHs indicate that the majority of galaxies with log ( M ⋆ / M ⊙ ) < 10.5 are observed while their central regions undergo relatively recent (