Fig. 7.
Application of our model to the particular case of II Zw 40. Panels a show how the observed L[C II]/LTIR and L[C II]/L[O I] line ratios allow us to constrain nH and G0. Panel b shows how the L[C II]/LCO(1−0) ratio evolves in II Zw 40 as a function of AV, given the parameters previously derived from panel a. The green line indicates the best matching model. Panels c show the corresponding factors to convert L[C II], L[C I], and LCO to MH2 (see Sect. 6).
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