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Table 1.

General properties of the main MIR and FIR used in this work.

Species λ E Tex ncrit
(μm) (eV) (K) (cm−3)
Used to constrain the models
[Ne III] 15.56 40.96 925 3 × 105 [e]
[O III] 88.36 35.12 163 2 × 103 [e]
[S IV] 10.51 34.79 1369 4 × 104 [e]
[N III] 57.32 29.60 251 1 × 103 [e]
[Ar III] 8.99 27.63 1600 3 × 105 [e]
[Ar III] 21.83 27.63 2259 5 × 104 [e]
[S III] 18.71 23.34 1199 2 × 104 [e]
[S III] 33.48 23.34 430 5 × 103 [e]
[Ne II] 12.81 21.56 1123 6 × 105 [e]
[Ar II] 6.99 15.76 2060 4 × 105 [e]
[N II] 121.9 14.53 188 3 × 102 [e]
Huα 12.36 13.60 1163 ...
[C II] 157.7 11.26 91 50 [e], 3 × 103 [H]
[O I] 63.18 ... 228 2 × 105 [H]
[O I] 145.5 ... 327 4 × 104 [H]
LTIR 3–1000 ... ... ...
Compared a posteriori to models
[Fe III] 22.93 16.19 628 1 × 105 [e]
[Si II] 34.82 8.15 413 2 × 103 [e], 4 × 105 [H]
[Fe II] 25.99 7.90 554 3 × 104 [e]
[Fe II] 17.93 7.90 3 496 7 × 104 [e]
H2 S(0) 28.21 ... 510 1 × 103 [H]
H2 S(1) 17.03 ... 1 015 4 × 104 [H]
H2 S(2) 12.28 ... 1 682 1 × 106 [H]
H2 S(3) 9.66 ... 2 504 2 × 106 [H]
LBOL 0.1–1,000 ... ... ...

Notes. Columns: wavelength of the transition, energy to remove electrons to reach this state, excitation temperature required to populate the transition level from the ground state, critical density with electrons [e] (for T = 10 000 K) or hydrogen atoms [H] (for T = 100 K) used in Cloudy. We note that collisions of [Fe II] with H atoms are not considered in this version of Cloudy.

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