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Fig. 2.


Adopted hydrogen density profile in the default grid of models as a function of visual extinction, shown for Zbin = 0.5 (solid line) and Zbin = 0.1 (dot-dash line). We also show the density profile for the constant pressure test performed in Sect. 5.4 (gray solid line). Model parameters are set to nH = 102 cm−3 and log U = −2. The phase transitions from H+-dominated to H I-dominated and from H I-dominated to H2-dominated are indicated with vertical lines. We note that AV of 1 mag corresponds to a hydrogen column density that is 5× larger at Zbin = 0.1 than at Zbin = 0.5.

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