Open Access
Table B.1.
Line excitation conditions for the three fine-structure lines used in this work.
| Line | IE | Eu/k | ncrit, H | ncrit, e | Origin |
|---|---|---|---|---|---|
| [eV] | [K] | [cm−3] | [cm−3] | ||
| [C II] 158μm | 11.3 | 91 | 1.6 × 103 | 44 | PDRs, diffuse H I clouds, diffuse ionized gas, H II regions |
| [O I] 63μm | - | 228 | 5 × 105 | - | Warm and/or dense PDRs |
| [O III] 88μm | 35.1 | 163 | - | 510 | Diffuse, highly ionized gas |
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