Table 3
Parameters for different relevant molecular and atomic transitions.
| Line | Frequency/GHz | Eupper/K | ncr/cm-3 |
|
|
|||
| 12CO J = 1 → 0 | 115.2712 | 5.5 | 2 × 103 |
| 12CO J = 3 → 2 | 345.7959 | 33.2 | 4 × 104 |
| 12CO J = 4 → 3 | 461.0408 | 55.3 | 9 × 104 |
| 12CO J = 7 → 6 | 806.6517 | 154.9 | 4 × 105 |
| 12CO J = 9 → 8 | 1036.912 | 248.9 | 1 × 106 |
| 13CO J = 1 → 0 | 110.2013 | 5.3 | 2 × 103 |
| 13CO J = 4 → 3 | 440.7654 | 52.9 | 8 × 104 |
[C i]  |
492.1607 | 23.6 | 1 × 103 |
[C i]  |
809.3446 | 62.5 | 1 × 103 |
[O i]  |
4744.777 | 227.7 | 6 × 105 |
[O i]  |
2060.069 | 326.6 | 7 × 104 |
[C ii]  |
1900.5377 | 91.2 | 5 × 103 |
Notes. The listed critical densities were calculated for collisions with p-H2 and a kinetic temperature of 100 K. The critical densities were calculated using the Einstein A – and collisional rate coefficients taken from the Leiden Atomic and Molecular Database (LAMDA; Schöier et al. 2005).
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