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• W2079242967 endingPage "127" @default.
• W2079242967 startingPage "127" @default.
• W2079242967 abstract "There is ample observational evidence that the star formation rate (SFR) surface density, ΣSFR, is closely correlated with the surface density of molecular hydrogen, . This empirical relation holds both for galaxy-wide averages and for individual ≳kpc sized patches of the interstellar medium, but appears to degrade substantially at a sub-kpc scale. Identifying the physical mechanisms that determine the scale-dependent properties of the observed relation remains a challenge from a theoretical perspective. To address this question, we analyze the slope and scatter of the relation using a set of cosmological, galaxy formation simulations with a peak resolution of ∼100 pc. These simulations include a chemical network for molecular hydrogen, a model for the CO emission, and a simple, stochastic prescription for star formation that operates on ∼100 pc scales. Specifically, star formation is modeled as a Poisson process in which the average SFR is directly proportional to the present mass of H2. The predictions of our numerical model are in good agreement with the observed Kennicutt–Schmidt and relations. We show that observations based on CO emission are ill suited to reliably measure the slope of the latter relation at low (≲ 20 M☉ pc−2) H2 surface densities on sub-kpc scales. Our models also predict that the inferred relation steepens at high H2 surface densities as a result of the surface density dependence of the CO/H2 conversion factor. Finally, we show that on sub-kpc scales most of the scatter of the relation is a consequence of discreteness effects of the star formation process. In contrast, variations of the CO/H2 conversion factor are responsible for most of the scatter measured on super-kpc scales." @default.
• W2079242967 created "2016-06-24" @default.
• W2079242967 creator A5032654760 @default.
• W2079242967 creator A5060782488 @default.
• W2079242967 creator A5063586360 @default.
• W2079242967 date "2012-10-08" @default.
• W2079242967 modified "2023-09-27" @default.
• W2079242967 title "THE X-FACTOR IN GALAXIES. II. THE MOLECULAR-HYDROGEN-STAR-FORMATION RELATION" @default.
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