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Table 5
Cloud model parameters.
| Parameter | Symbol | Values |
|---|---|---|
| Gas density | n⟨H ⟩ | 2 × 104 cm−3 |
| Temperature | Td = Tg | 10 and 20 to 900 K |
| Extinction | AV | 10 |
| Strength of interstellar UV | χISM | 1 |
| Cosmic ray H2 ionisation rate | ζCR | 1.7 × 10−17 s−1 |
| Grain radius | a | 10−5 cm |
| Dust-to-gas mass ratio | δ | 0.01 |
| PAH abundance rel. to ISM | fPAH | 0.01, 1 |
| Number of chemisorbed layers | Ncore,layer | 5 |
Notes. χ ISM = 1 is the ISM Draine UV field. fPAH = 1 corresponds to a PAH abundance of 3 × 10−7 (Tielens 2005).
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