Open Access
Table 1.
Computed critical densities (cm−3) for fine structure IR lines from PYNEB, for different electronic temperatures.
| Emission line | Te = 5000 K | Te = 10 000 K | Te = 15 000 K | Te = 20 000 K | Te = 25 000 K | Te = 30 000 K |
|---|---|---|---|---|---|---|
| [S IV]λ10.5 μm | 4.0 × 104 | 5.6 × 104 | 6.9 × 104 | 7.9 × 104 | 8.8 × 104 | 9.6 × 104 |
| [Ne II]λ12.8 μm | 4.6 × 105 | 6.3 × 105 | 7.4 × 105 | 8.4 × 105 | 9.2 × 105 | 1.0 × 106 |
| [Ne V]λ14.3 μm | 1.8 × 104 | 3.2 × 104 | 4.7 × 104 | 6.3 × 104 | 7.8 × 104 | 9.3 × 104 |
| [Ne III]λ15.6 μm | 1.5 × 105 | 2.1 × 105 | 2.5 × 105 | 2.8 × 105 | 3.0 × 105 | 2.9 × 105 |
| [S III]λ18 μm | 8173 | 1.2 × 104 | 1.5 × 104 | 1.7 × 104 | 1.8 × 104 | 2.0 × 104 |
| [Ne V]λ24 μm | 3579 | 5952 | 8426 | 1.1 × 104 | 1.3 × 104 | 1.6 × 104 |
| [O IV]λ26 μm | 8387 | 9905 | 1.2 × 104 | 1.3 × 104 | 1.4 × 104 | 1.5 × 104 |
| [S III]λ33 μm | 980 | 1417 | 1801 | 2140 | 2425 | 2686 |
| [O III]λ52 μm | 2753 | 3530 | 3879 | 4082 | 4233 | 4418 |
| [N III]λ57 μm | 1180 | 1519 | 1723 | 1859 | 1938 | 1971 |
| [O III]λ88 μm | 388 | 501 | 569 | 620 | 662 | 704 |
| [N II]λ122 μm | 198 | 238 | 256 | 267 | 276 | 283 |
| [N II]λ205 μm | 30 | 38 | 44 | 47 | 51 | 54 |
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