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We study the physical properties of giant molecular cloud associations (GMAs)in M100 (NGC 4321) using the ALMA Science Verification feathered (12-m+ACA)data in 12CO (1-0). To examine the environmental dependence of GMA properties,GMAs are classified based on their locations in the various environments ascircumnuclear ring (CNR), bar, spiral, and inter-arm GMAs. The CNR GMAs aremassive and compact, while the inter-arm GMAs are diffuse with low surfacedensity. GMA mass and size are strongly correlated, as suggested by Larson(1981). However, the diverse power-law index of the relation implies that theGMA properties are not uniform among the environments. The CNR and bar GMAsshow higher velocity dispersion than those in other environments. We findlittle evidence for a correlation between GMA velocity dispersion and size,which indicates that the GMAs are in diverse dynamical states. Indeed, thevirial parameter of GMAs spans nearly two orders of magnitude. Only the spiralGMAs are in general self-gravitating. Star formation activity of the GMAsdecreases in order over the CNR, spiral, bar, and the inter-arm GMAs. Thediverse GMA and star formation properties in different environments lead tovariations in the Kennicutt-Schmidt relation. A combination of multiplemechanisms or gas phase change is necessary to explain the observed slopes.Comparisons of GMA properties acquired with the use of the 12-m-arrayobservations with those from the feathered data are also presented. The resultsshow that the missing flux and extended emission cannot be neglected for thestudy of environmental dependence.

astrophysical journal/the astrophysical journal

Variation in GMC Association Properties Across Bars, Spiral Arms,  Inter-Arms, and Circumnuclear Region of M100 (NGC 4321) Extracted from ALMA  Observations