Table 1
Input parameters in the Meudon PDR code.
| Free parameters | |||
|---|---|---|---|
| Parameter | Value | Unit | Grid |
| Gaz thermal pressure, Pth | [105, 109] | K cm−3 | on log. scale |
| UV intensity, GUV | [1, 105] | (1) | on log. scale |
Visual extinction,  |
[1,40] | mag | on log. scale |
| Inclination angle, α | [0,60] | deg | on lin. scale |
| Fixed parameters | |||
| Parameter | Value | Unit | Note |
| Cosmic ray ionization rate | 10−16 | s−1 per H2 | (2), (3) |
| Dust extinction curve | Galaxy | … | (4) |
| RV | 3.1 | … | (4) |
| NH / E (B − V) | 5.8 × 1021 | cm−2 | (5) |
| Mass grain/mass gas | 0.01 | … | … |
| Grain size distribution | ∝ a−3.5 | … | (6) |
| Min grain radius | 10−7 | cm | … |
| Max grain radius | 3 × 10−5 | cm | … |
References. (1) GUV is the scaling parameter relative to the interstellar standard radiation field from Mathis et al. (1983); (2) Le Petit et al. (2004); (3) Indriolo et al. (2007); (4) Fitzpatrick & Massa (2007); (5) Bohlin et al. (1978); (6) The distribution of grain radius a is a power law (Mathis et al. 1977).
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