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Fig. 4

image

Modeling the relative population levels of the H2 transitions using single excitation-temperature LTE models (see Davies et al. 2003). The relative population levels have been derived from the intensities of the H2 transitions listed in Table A.1. The circles and squares represent the narrow and broad component, respectively. The solid lines show the single-temperature fits using both the ν = 1 and ν = 2 transitions (i.e., assuming fully thermalized LTE gas conditions). The dashed lines show the single-temperature fits to only the ν = 1 transitions (i.e., taking into consideration that the ν = 2 transitions could be over-populated compared to fully thermalized LTE conditions). The best-fit temperatures for the narrow (n) and broad (b) component in the various regions are also show (with in brackets the temperature derive from the fit to only the ν = 1 transitions).

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