Ionization parameter γ versus the6.2/11.3 PAH band ratio. The data points for IC 63 and IC 59 are shown in blue and red, respectively. The black points are taken from Stock et al. (2016), while the lines correspond to the fit and its 1σ deviations derived from the systematic study of PAH emission in Galactic regions done by Galliano et al. (2008). We have highlighted the data points for NGC 2023 N (north) and NGC 2023 S (south), since these are PDRs in the reflection nebula NGC2023, which is a relatively benign environment comparable to IC 63 and IC 59.
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