Gas surface density, star formation rate surface density, and the maximum mass of young star clusters in a disk galaxy. I. The flocculent galaxy M33
Abstract
We analyze the relationship between maximum cluster mass, Mmax, and surface densities of total gas (Sigmagas), molecular gas (SigmaH2) and star formation rate (SigmaSFR) in the flocculent galaxy M33, using published gas data and a catalog of more than 600 young star clusters in its disk. By comparing the radial distributions of gas and most massive cluster masses, we find that Mmax is proportional to Sigmagas4.7, Mmax is proportional SigmaH21.3, and Mmax is proportional to SigmaSFR1.0. We rule out that these correlations result from the size of sample; hence, the change of the maximum cluster mass must be due to physical causes.
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