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Table 3
Input parameters for the PDR model.
| Parameter | Notation | Value |
|
|
||
| Pressure | P | 104−108 cm-3 K |
| Radiation field | GUV | 1−105 |
| Cosmic ray flux | ζ a | 3 × 10-16 s-1 |
| Total visual extinction |
|
1−10 mag |
| Metallicity | Z b | 0.5 Z⊙ |
| PAH fraction | f PAH | 1% |
| Dust-to-gas mass ratio | Mdust/Mgas | 5 × 10-3 |
|
|
||
| Gas phase abundancesc | log(n(X) /n(H)) | |
|
|
||
| He | –1.05 | |
| C | –4.3 | |
| N | –4.91 | |
| O | –3.75 | |
| Ne | –4.36 | |
| Si | –5.51 | |
| S | –5.32 | |
Notes.
(b)
Metallicity: 12+log(O/H) = 8.38 (Rolleston et al. 2002; Pagel 2003) and (O/H)⊙ = 4.9 × 10-4 (Asplund et al. 2009);
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