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The newly installed Wide Field Camera 3 (WFC3) on the Hubble Space Telescopehas been used to obtain multi-band images of the nearby spiral galaxy M83.These new observations are the deepest and highest resolution images ever takenof a grand-design spiral, particularly in the near ultraviolet, and allow us tobetter differentiate compact star clusters from individual stars and to measurethe luminosities of even faint clusters in the U band. We find that theluminosity function for clusters outside of the very crowded starburst nucleuscan be approximated by a power law, dN/dL \propto L^{alpha}, with alpha = -2.04+/- 0.08, down to M_V ~ -5.5. We test the sensitivity of the luminosityfunction to different selection techniques, filters, binning, and aperturecorrection determinations, and find that none of these contribute significantlyto uncertainties in alpha. We estimate ages and masses for the clusters bycomparing their measured UBVI,Halpha colors with predictions from singlestellar population models. The age distribution of the clusters can beapproximated by a power-law, dN/dt propto t^{gamma}, with gamma=-0.9 +/- 0.2,for M > few x 10^3 Msun and t < 4x10^8 yr. This indicates that clusters aredisrupted quickly, with ~80-90% disrupted each decade in age over this time.The mass function of clusters over the same M-t range is a power law, dN/dMpropto M^{beta}, with beta=-1.94 +/- 0.16, and does not have bends or showcurvature at either high or low masses. Therefore, we do not find evidence fora physical upper mass limit, M_C, or for the earlier disruption of lower massclusters when compared with higher mass clusters, i.e. mass-dependentdisruption. We briefly discuss these implications for the formation anddisruption of the clusters.

The Luminosity, Mass, and Age Distributions of Compact Star Clusters in M83 Based on HST/WFC3 Observations