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Table 1.
IR tracers used as constraints and corresponding ionization potentials for ionic lines.
| Tracers | |
|---|---|
| Molecularhydrogen | H2 S(0), H2 S(1), H2 S(2), H2 S(3) |
| Neutral and ionized | [O I]λλ63,145 μm |
| gas tracers | [Fe II]λλ17,25 μm (7.9 eV), |
| [Si II]λ34 μm (8.2 eV), | |
| [C II]λ158 μm (11.3 eV), | |
| Huαλ12 μm (13.6 eV), | |
| [N II]λλ122,205 μm (14.5 eV), | |
| [Ar II]λ7 μm (15.7 eV), | |
| [Fe III]λ23 μm (16.2 eV), | |
| [Ne II]λ12 μm (21.6 eV), | |
| [S III]λλ18,33 μm (23.3 eV), | |
| [Ar III]λλ9,21 μm (27.6 eV), | |
| [N III]λ57 μm (29.6 eV), | |
| [S IV]λ10 μm (34.7 eV), | |
| [O III]λ88 μm (35.1 eV), | |
| [Ne III]λ15 μm (40.9 eV) | |
| [O IV]λ26 μm (54.9 eV), | |
| [Ne V]λλ14,24 μm (97.1 eV), | |
| Total IR luminosity | LTIR (1 μm–1000 μm) |
Notes. We report the ionization potentials corresponding to the energy thresholds required to create the ion producing a given emission line, either by de-excitation or by recombination.
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