Fig. 14
Theoretical photoelectric heating efficiency of PAHs, clusters of PAHs, and very small grains is plotted against the ionization parameter γ = G0T0.5/ne (Bakes & Tielens 1994). We added the orange data points for the Horsehead PDR and PDR1. Blue data points are for the diffuse-ISM sight lines ζ Oph and o Per, and the PDRs Orion Bar and NGC 2023. Figure adapted from Tielens (2008).
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