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The initial cluster mass function (ICMF) is a fundamental property of starformation in galaxies. To gauge its universality, we measure and compare theICMFs in irregular and spiral galaxies. Our sample of irregular galaxies isbased on 13 nearby galaxies selected from a volume-limited sample from thefifth data release of the Sloan Digital Sky Survey (SDSS). The extinctions,ages, and masses were determined by comparing their u'g'i'z' magnitudes tothose generated from starburst models. Completeness corrections were performedusing Monte Carlo simulations in which artificial clusters were inserted intoeach galaxy. We analyzed three nearby spiral galaxies with SDSS data in exactlythe same way to derive their ICMF based on a similar number of young, massiveclusters as the irregular galaxy ICMF. We find that the ICMFs of irregular andspiral galaxies for masses >3x10^4 M_sun are statistically indistinguishable.For clusters more massive than 3x10^4 M_sun, the ICMF of the irregular galaxiesis reasonably well fit by a power law dN(M)/dM ~ M^-a_M with a_M = 1.88 +/-0.09. Similar results were obtained for the ICMF of the spiral galaxy samplebut with a_M = 1.75 +/- 0.06. We discuss the implications of our result fortheories of star cluster formation: the shape of the ICMF appears to beindependent of metallicity and galactic shear rate.

THE INITIAL CLUSTER MASS FUNCTION OF SUPER STAR CLUSTERS IN IRREGULAR AND SPIRAL GALAXIES