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We present a comparative study of the molecular gas in two galaxies from theLEGUS sample: barred spiral NGC 1313 and flocculent spiral NGC 7793. These twogalaxies have similar masses, metallicities, and star formation rates, but NGC1313 is forming significantly more massive star clusters than NGC 7793,especially young massive clusters (<10 Myr, >10^4 Msol). Using ALMA CO(2-1)observations of the two galaxies with the same sensitivities and resolutions of13 pc, we directly compare the molecular gas in these two similar galaxies todetermine the physical conditions responsible for their large disparity incluster formation. By fitting size-linewidth relations for the clouds in eachgalaxy, we find that NGC 1313 has a higher intercept than NGC 7793, implyingthat its clouds have higher kinetic energies at a given size scale. NGC 1313also has more clouds near virial equilibrium than NGC 7793, which may beconnected to its higher rate of massive cluster formation. However, thesevirially bound clouds do not show a stronger correlation with young clustersthan that of the general cloud population. We find surprisingly smalldifferences between the distributions of molecular cloud populations in the twogalaxies, though the largest of those differences are that NGC 1313 has highersurface densities and lower free-fall times.

ALMA-LEGUS I: The Influence of Galaxy Morphology on Molecular Cloud Properties