The unified model of the H II region and PDR: Infrared lines and thermal dust emission

Details The unified model of the H II region and PDR: Infrared lines and thermal dust emission The unified model of the H II region and PDR: Infrared lines and thermal dust emission

2012-01-11

arxiv.org/abs/1201.2230v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

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Scientific paper

We demonstrate a unified modeling method using the spectral synthesis code CLOUDY to self-consistently compute the structure of an H II and PDR that are in pressure equilibrium. With the unified model, emission contributions from PDRs and H II regions are computed simultaneously. We explore the effect of varying the spectral energy distribution of incident continuum, and apply the results to extra-galaxies. We focus on PDR diagnostics that also emerge from H II regions, and far-infrared (FIR) thermal emission from dust grains. We first present plots of FIR continuum ratios and the contribution from H II regions for dust FIR emission. With these plots, we successfully explain the FIR continuum ratios of M 82 observed by Herschel.

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