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Table 4.
Critical densities for the main far–IR fine-structure lines from the ionized gas considered in our work, computed for different gas temperatures Tgas.
| Ion | Line | Tgas [K] | ||
|---|---|---|---|---|
| 5000 | 10 000 | 20 000 | ||
| (1) | (2) | (3) | (4) | (5) |
| [N II] | 1–0 | 127 | 169 | 222 |
| [N II] | 2–1 | 199 | 260 | 333 |
| [O III] | 1–0 | 1307 | 1798 | 2496 |
| [O III] | 2–1 | 2227 | 3048 | 4163 |
| [C II]ion | 3/2–1/2 | 41 | 54 | 71 |
Notes. For [C II], we consider the ionized component only.
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