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Table 2
Relative number of solo (s), duo1 (d), trio (t), and quartet (q) CH groups in PAHs across the Orion Bar, and NGC 7027 and IRAS 18317-0757, as derived by Hony et al. (2001) and updated for the s/t ratio from Bauschlicher et al. (2009).
| Object | s/d | s/t | s/q |
|---|---|---|---|
| Orion Bar | |||
| Atomic PDR | 16.4 | 1.5 | 46.4 |
| DF 1 | 16.8 | 1.5 | 33.2 |
| Between DFs 1 and 2 | 17.2 | 1.5 | 30.8 |
| DF2 | 14.8 | 1.5 | 22.4 |
| DF3 | 14.2 | 1.5 | 22.4 |
| Beyond DF 3 | 20.6 | 1.8 | 30.8 |
| NGC 7027 | 7.7 | 9.2 | 28.5 |
| IRAS 18317 | 3.4 | 1.6 | 10.2 |
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