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Date and Time of the Query: 2018-11-19 T11:27:42 PST
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For refcode 2013ApJ...777L...4W:
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Copyright by American Astronomical Society. Reproduced by permission
2013ApJ...777L...4W CARMA Survey toward Infrared-bright Nearby Galaxies (STING). III. The Dependence of Atomic and Molecular Gas Surface Densities on Galaxy Properties Wong, Tony; Xue, Rui; Bolatto, Alberto D.; Leroy, Adam K.; Blitz, Leo; Rosolowsky, Erik; Bigiel, Frank; Fisher, David B.; Ott, Jurgen; Rahman, Nurur; Vogel, Stuart N.; Walter, Fabian Abstract. We investigate the correlation between CO and H I emission in 18 nearby galaxies from the CARMA Survey Toward IR-Bright Nearby Galaxies (STING) at sub-kpc and kpc scales. Our sample, spanning a wide range in stellar mass and metallicity, reveals evidence for a metallicity dependence of the H I column density measured in regions exhibiting CO emission. Such a dependence is predicted by the equilibrium model of McKee and Krumholz, which balances H_2_ formation and dissociation. The observed H I column density is often smaller than predicted by the model, an effect we attribute to unresolved clumping, although values close to the model prediction are also seen. We do not observe H I column densities much larger than predicted, as might be expected were there a diffuse H I component that did not contribute to H_2_ shielding. We also find that the H_2_ column density inferred from CO correlates strongly with the stellar surface density, suggesting that the local supply of molecular gas is tightly regulated by the stellar disk. Key words: galaxies: ISM, ISM: atoms, ISM: molecules
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