PAH charge states peak with cations in the atomic PDR and neutrals in HII and molecular regions, with average sizes of 60-74 carbon atoms, indicating top-down formation near the ionization front and bottom-up in the molecular cloud.
P., Lequeux, J., & Verstraete, L
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PDRs4All: XVIII. The evolution of the PAH ionisation and PAH size distribution across the Orion Bar
PAH charge states peak with cations in the atomic PDR and neutrals in HII and molecular regions, with average sizes of 60-74 carbon atoms, indicating top-down formation near the ionization front and bottom-up in the molecular cloud.