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Table 3
PDR model parameters.
| Parameter | Value | Comment |
|
|
||
| ζ | 5 × 10-17 s-1 | cosmic ray ionization |
| vturb | 2 km s-1 | turbulent velocity |
| Extinction | standard galactic | parameterization of Fitzpatrick & Massa (1990) |
| R V | 3.10 | Av/E(B − V) |
| ω | 4.20e–01 | dust albedo |
| g | 6.00e–01 | dust anisotropy factor |
| G | 1.00e–02 | Dust to gas mass ratio |
| ρ | 3 g/cm3 | Dust density (g/cm3) |
| α | 3.50e+00 | MRN dust size distribution index |
| amin | 1.00e–07 cm | dust minimum radius |
| amax | 1.50e–05 cm | dust maximum radius |
| Rf | 1.5 × 10-16 cm3 s-1 | H2 formation rate (Habart et al. 2004) |
| qH − H2 | H + H2 collision rate (Le Bourlot et al. 1999) | |
| He/H | 0.1 | |
| O/H | 3.2 × 10-4 | Gas abundance (Meyer et al. 1998) |
| C/H | 1.3 × 10-4 | Gas abundance (Savage & Sembach 1996) |
| N/H | 7.5 × 10-5 | Gas abundance (Meyer et al. 1997) |
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