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We measure the radii and two-dimensional light profiles of a large sample ofyoung, massive star clusters in M83 using archival HST/WFC3 imaging of sevenadjacent fields. We use GALFIT to fit the two-dimensional light profiles of theclusters, from which we find effective (half-light) radii, core radii, andslopes of the power-law (EFF) profile ($\eta$). We find lognormal distributionsof effective radius and core radius, with medians of $\approx$2.5 pc and$\approx$1.3 pc, respectively. Our results provide strong evidence for acharacteristic size of young, massive clusters. The average effective radiusand core radius increase somewhat with cluster age. Little to no change ineffective radius is observed with increasing galactocentric distance, exceptperhaps for clusters younger than 100 Myr. We find a shallow correlationbetween effective radius and mass for the full cluster sample, but a strongercorrelation is present for clusters 200-300 Myr in age. Finally, the majorityof the clusters are best fit by an EFF model with index $\eta\leq3.0$. There isno strong evidence for change in $\eta$ with cluster age, mass, orgalactocentric distance. Our results suggest that clusters emerge from earlyevolution with similar radii and are not strongly affected by the tidal fieldof M83. Mass loss due to stellar evolution and/or GMC interactions appear todominate cluster expansion in the age range we study.

Sizes and Shapes of Young Star Cluster Light Profiles in M83