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• W3105256871 endingPage "10" @default.
• W3105256871 startingPage "10" @default.
• W3105256871 abstract "We present new analytic theory and radiative transfer computations for the atomic to molecular (HI-to-H2) transitions, and the build-up of atomic-hydrogen (HI) gas columns, in optically thick interstellar clouds, irradiated by far-ultraviolet photodissociating radiation fields. We derive analytic expressions for the total HI column densities for (1D) planar slabs, for beamed or isotropic radiation fields, from the weak- to strong-field limits, for gradual or sharp atomic to molecular transitions, and for arbitrary metallicity. Our expressions may be used to evaluate the HI column densities as functions of the radiation field intensity and the H2-dust-limited dissociation flux, the hydrogen gas density, and the metallicity-dependent H2 formation rate-coefficient and far-UV dust-grain absorption cross-section. We make the distinction between HI-dust and H2-dust opacity, and we present computations for the universal H2-dust-limited effective dissociation bandwidth. We validate our analytic formulae with Meudon PDR code computations for the HI-to-H2 density profiles, and total HI column densities. We show that our general 1D formulae predict HI columns and H2 mass fractions that are essentially identical to those found in more complicated (and approximate) spherical (shell/core) models. We apply our theory to compute H2 mass fractions and star-formation thresholds for individual clouds in self-regulated galaxy disks, for a wide range of metallicities. Our formulae for the HI columns and H2 mass fractions may be incorporated into hydrodynamics simulations for galaxy evolution." @default.
• W3105256871 created "2020-11-23" @default.
• W3105256871 creator A5046451348 @default.
• W3105256871 creator A5069212337 @default.
• W3105256871 creator A5072850029 @default.
• W3105256871 creator A5076171671 @default.
• W3105256871 date "2014-06-27" @default.
• W3105256871 modified "2023-10-11" @default.
• W3105256871 title "H I-TO-H₂TRANSITIONS AND H I COLUMN DENSITIES IN GALAXY STAR-FORMING REGIONS" @default.
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