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Table 8
Comparison between the observed IR line fluxes and models.
| Line | Observed | Nebua | ℳ4a | ℳ4b | ℳ4c | |
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| Ionized gas | ||||||
| H i Huα12.37 μm | 8.5 ± 3 | 9.5 | 8.9 | 8.9 | 9.1 | |
| [O iii] 88 μm | 200 ± 30 | 207.9 | 188.0 | 188.1 | 188.7 | |
| [O iv] 25.9 μm | 38 ± 8 | 49.6 | 45.3 | 45.3 | 43.6 | |
| [Ne ii] 12.8 μm | 6 ± 3 | 3.0 | 2.0 | 2.0 | 2.1 | |
| [Ne iii] 15.6 μm | 47 ± 10 | 47.0 | 45.7 | 45.7 | 45.9 | |
| [Ne iii] 36.0 μm | <7 | 4.2 | 4.1 | 4.1 | 4.2 | |
| [Ne v] 14.3 μm | <2.3 | 0.7 | 0.8 | 0.8 | 0.6 | |
| [Ne v] 24.3 μm | <4 | 0.8 | 1.0 | 1.0 | 0.7 | |
| [S iii] 18.7 μm | 28 ± 7 | 28.3 | 23.3 | 23.3 | 24.3 | |
| [S iii] 33.5 μm | 40 ± 7 | 51.6 | 47.7 | 47.7 | 50.0 | |
| [S iv] 10.5 μm | 49 ± 10 | 117.7 | 107.7 | 107.7 | 103.2 | |
| [Ar ii] 7.0 μm | <5 | 1.4 | 0.5 | 0.5 | 0.5 | |
| [Ar iii] 9.0 μm | <10 | 8.1 | 6.3 | 6.3 | 6.6 | |
| [Ar iii] 21.8 μm | <8 | 0.6 | 0.5 | 0.5 | 0.5 | |
| [Fe iii] 22.9 μm | <6 | 3.2 | 2.8 | 2.8 | 3.1 | |
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| Neutral gas | ||||||
| [C i] 609 μm | ... | ... | 3 × 10-4 | 3 × 10-4 | 0.2 | |
| [C i] 370 μm | ... | ... | 6 × 10-4 | 6 × 10-4 | 0.8 | |
| [C ii] 157 μm | 76 ± 20 | 77.1 | 79.0 | 77.0 | 77.9 | |
| [O i] 63 μm | 60 ± 20 | 60.5 | 63.3 | 63.2 | 68.3 | |
| [Si ii] 34.8 μm | 65 ± 12 | 52.6 | 49.9 | 49.9 | 54.7 | |
| [Fe ii] 17.9 μm | <3 | 1.6 | 1.1 | 1.1 | 1.1 | |
| [Fe ii] 26.0 μm | 13 ± 8 | 9.6 | 4.4 | 4.4 | 4.7 | |
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| Molecular gas | ||||||
| H2 0-0 S(0) 28.2 μm | <7 | ... | ... | 7 × 10-6 | 2.7 | |
| H2 0-0 S(1) 17.0 μm | <7 | ... | ... | 2 × 10-4 | 0.1 | |
| H2 0-0 S(2) 12.3 μm | <7.5 | ... | ... | 2 × 10-6 | 5 × 10-5 | |
| H2 1-0 S(1) 2.12 μm | < 2 b | ... | .. | 7 × 10-4 | 3 × 10-3 | |
| CO(1-0) | <8 × 10-3 c | ... | ... | 2 × 10-11 | 8 × 10-3 | |
| PAH (6–15 μm) | < 190 | ... | ... | 200.0 | 212.4 | |
Notes. Fluxes in units Hβ = 1000.
(a)
See Sect. 4.2.
(b)
From Izotov & Thuan (2016), assuming H22.122 μm/Brγ~ 0.1 and Brγ/Hβ< 1.7%.
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