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Table 3
Main parameters used in the PDR models of the Orion Bar.
| Model parameter | Orion Bar | Horsehead |
|---|---|---|
| FUV radiation field, G0 | 2 × 104 Habing(a) | 100 Habing(b) |
| Thermal pressure Pth/kB | 2 × 108 cm-3K(c) | 4 × 106 cm−3K(d) |
| nH = n(H) + 2n(H2) | nH = Pth / kBTk | |
| Cosmic Ray ζCR | 10−16 H2 s−1 | |
| Rv = Av/Eb−v | 5.5(e) | |
| Abundance O/H | 3.2 × 10−4 (f) | |
| Abundance C/H | 1.4 × 10−4 (g) | |
| Abundance N/H | 7.5 × 10−5 (h) | |
| Abundance S/H | 1.4 × 10−5 (i) | |
Notes. (a)Marconi et al. (1998). (b)Abergel et al. (2002). (c)Joblin et al. (2018). (d)Habart et al. (2005). (e)Cardelli et al. (1989). (f)Meyer et al. (1998). (g)Sofia et al. (2004). (h)Meyer et al. (1997). (i)Goicoechea & Cuadrado (2021).
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