Table 3
Parameters used in the PDR models of the negative-vLSR globules and comparison with observed intensities.
| Model parameter | Value | Note |
|---|---|---|
| Local G0 | 40 Habing | Best model |
| Total depth AV | 1.8 mag | |
| Gas density nH | 2 × 104 cm−3 | |
| Cosmic ray ζCR | 10−16 H2 s−1 | (a) |
| RV = AV/EB-V | 5.5 | Orion(b) |
| NH/AV | 2.86 × 1021 cm−2 mag−1 | Orion(b) |
| Mgas∕Mdust | 100 | Local ISM |
| Abundance O / H | 3.2 × 10−4 | |
| Abundance 12C / H | 1.5 × 10−4 | Orion(c) |
| Abundance N / H | 7.5 × 10−5 | |
| Abundance S / H | 1.5 × 10−5 | |
| 12C / 13C | 67 | Orion(d) |
| Species | Predicted N(cm−2) | |
| C+ | 3.5 × 1017 | Best model |
| 12CO | 5.2 × 1015 | Best model |
| 13CO | 1.8 × 1014 | Best model |
| Predicted W | Observed | |
| Line | (K km s−1) | (K km s−1) |
| [C II] 158μm | 32.3 | 29.3(†) ± 6.0(‡) |
| 12CO (2–1) | 10.8 | 9.5(†) ± 4.3(‡) |
| 13CO (2–1) | 0.4 | 0.7(†) ± 0.3(‡) |
References. (a)From Indriolo et al. (2015). (b)From Lee (1968) and Cardelli et al. (1989). (c)From Sofia et al. (2004). (d)From Langer et al. (1984).
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