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Table 2
Main parameters used in the PDR models of the Orion Bar.
| Model parameter | Value | Note |
|---|---|---|
| FUV illumination, G0 | 2 × 104 Habing | (a) |
| Total depth AV | 10 mag | |
| Thermal pressure Pth∕k | 2 × 108 cm−3K | |
| Density nH = n(H) + 2n(H2) | nH = Pth ∕ kTk | Varying |
| Cosmic ray ζCR | 10−16 H2 s−1 | (b) |
| RV = AV/EB-V | 5.5 | Orion(c) |
| Mgas∕Mdust | 100 | Local ISM |
| Abundance O / H | 3.2 × 10−4 | |
| Abundance C / H | 1.4 × 10−4 | Orion(d) |
| Abundance S / H | 1.4 × 10−5 | Solar(e) |
References. (a) Marconi et al. (1998). (b) Indriolo et al. (2015). (c) Cardelli et al. (1989). (d) Sofia et al. (2004). (e) Asplund et al. (2009).
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