Molecular tracers of radiative feedback in Orion (OMC-1) - Widespread CH+ (J = 1–0), CO (10–9), HCN (6–5), and HCO+ (6–5) emission

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Fig. 10

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Isobaric PDR model with P_th = 10⁸ cm⁻³ K and G₀ = 7.5 × 10³, the mean G₀ in OMC-1. Top panel: fractional abundances as a function of visual extinction (A_V) into the molecular cloud. Middle panel: normalized local line emissivities. H stands for the H₂ v = 1–0 S(1) line at 2.12 μm. Bottom panel: predicted gas temperature (T_gas), hydrogen nuclei gas density (n_H) and electron density (n_e) gradients.

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