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, M_max, and surface densities of total gas (Sigma_gas), molecular gas (Sigma_H2) and star formation rate (Sigma_SFR) 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 M_max is proportional to Sigma_gas^4.7, M_max is proportional Sigma_H2^1.3, and M_max is proportional to Sigma_SFR^1.0. 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.

accepted for publication in ApJ

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• The Origin of Exponential Star-forming Disks
• Signatures of long-lived spiral patterns
• The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). IV. Star Cluster Catalog
• The structure and characteristic scales of the HI gas in galactic disks
• The galaxy-wide stellar initial mass function in the presence of cluster-to-cluster IMF variations
• The Similar Signatures of Coplanar Gas Inflow and Disk Warps in Galactic Gas Kinematic Maps
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