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We present the results obtained from an objective search for stellarclusters, both in the currently active nuclear starburst region, and in thepost-starburst disk of M82. Images obtained with the HST/ACS in F435W(B),F555W(V), and F814W(I) filters were used in the search for the clusters. Wedetected 653 clusters of which 393 are located outside the central 450 pc inthe post-starburst disk of M82. The luminosity function of the detectedclusters show an apparent turnover at B=22 mag (M_B=-5.8), which we interpretfrom Monte Carlo simulations as due to incompleteness in the detection of faintclusters, rather than an intrinsic log-normal distribution. We derived aphotometric mass of every detected cluster from models of simple stellarpopulations assuming a mean age of either an 8 (nuclear clusters) or 100 (diskclusters) million years old. The mass functions of the disk (older) and thenuclear (younger) clusters follow power-laws, the former being marginallyflatter (alpha=1.5+/-0.1) than the latter (alpha=1.8+/-0.1). The distributionof sizes (Full Width at Half Maximum) of clusters brighter than the apparentturn-over magnitude (mass>2E+4 Mo) can be described by a log-normal function.This function peaks at 10 pc for clusters more massive than 1E+5 Mo, whereasfor lower masses, the peak is marginally shifted to larger values for theyounger, and smaller values for the older clusters. The observed trend towardsflattening of the mass function with age, together with an over-abundance ofolder compact clusters, imply that cluster disruption in M82 is both dependenton the mass and size of the clusters.

HST/ACS imaging of M82: A comparison of mass and size distribution functions of the younger nuclear and older disk clusters