NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T08:09:44 PDT
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For refcode 2014MNRAS.437L..61S:
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Copyright by Royal Astronomical Society. 2014MNRAS.437L..61S Indications of a sub-linear and non-universal Kennicutt-Schmidt relationship Shetty, Rahul; Kelly, Brandon C.; Rahman, Nurur; Bigiel, Frank; Bolatto, Alberto D.; Clark, Paul C.; Klessen, Ralf S.; Konstandin, Lukas K. Abstract. We estimate the parameters of the Kennicutt-Schmidt (KS) relationship, linking the star formation rate (Sigma_SFR_) to the molecular gas surface density (Sigma_mol_), in the Survey Toward Infrared-Bright Nearby Galaxies sample of nearby disc galaxies using a hierarchical Bayesian method. This method rigorously treats measurement uncertainties, and provides accurate parameter estimates for both individual galaxies and the entire population. Assuming standard conversion factors to estimate Sigma_SFR_ and Sigma_mol_ from the observations, we find that the KS parameters vary between galaxies, indicating that no universal relationship holds for all galaxies. The KS slope of the whole population is 0.76, with the 2sigma range extending from 0.58 to 0.94. These results imply that the molecular gas depletion time is not constant, but varies from galaxy-to-galaxy, and increases with the molecular gas surface density. Therefore, other galactic properties besides just Sigma_mol_ affect Sigma_SFR_, such as the gas fraction or stellar mass. The non-universality of the KS relationship indicates that a comprehensive theory of star formation must take into account additional physical processes that may vary from galaxy to galaxy. Key words: methods: statistical, galaxies: ISM, galaxies: star formation
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