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We investigate the correlation between CO and HI emission in 18 nearbygalaxies from the CARMA Survey Toward IR-Bright Nearby Galaxies (STING) atsub-kpc and kpc scales. Our sample, spanning a wide range in stellar mass andmetallicity, reveals evidence for a metallicity dependence of the HI columndensity measured in regions exhibiting CO emission. Such a dependence ispredicted by the equilibrium model of McKee & Krumholz, which balances H_2formation and dissociation. The observed HI column density is often smallerthan predicted by the model, an effect we attribute to unresolved clumping,although values close to the model prediction are also seen. We do not observeHI column densities much larger than predicted, as might be expected were therea diffuse HI component that did not contribute to H_2 shielding. We also findthat the H_2 column density inferred from CO correlates strongly with thestellar surface density, suggesting that the local supply of molecular gas istightly regulated by the stellar disk.

CARMA Survey Toward Infrared-bright Nearby Galaxies (STING). III. The Dependence of Atomic and Molecular Gas Surface Densities on Galaxy Properties