Table 3.
Line fluxes and uncertainties for the nuclear region, as well as properties of the emission lines observed with Spitzer/IRS (Fig. 7), SOFIA/FIFI-LS (Fig. 3), and Herschel/PACS and SPIRE.
| Species | Transition | Rest wavelength | Flux | Critical density | Ionisation energy |
|---|---|---|---|---|---|
| [μm] | [10−16 Wm−2] | [cm−3] | [eV] | ||
| Spitzer/IRS | |||||
| [S IV] | 2P3/2 – 2P1/2 | 10.511 | 1.29 ± 0.21 | 5 × 104 [e] | 34.79 |
| H2 | 0−0 S(2) | 12.279 | 11.6 ± 1.06 | 2 × 105 [H2] | – |
| Hu α | n = 7−6 | 12.372 | 6.19 ± 1.58 | – | – |
| [Ne II] | 2P1/2 – 2P3/2 | 12.814 | 446.40 ± 44.64 | 7 × 105 [e] | 21.56 |
| [Ne V] | 3P2 – 3P1 | 14.322 | < 0.78 | 3 × 104 [e] | 97.12 |
| [Cl II] | 3P1 – 3P2 | 14.368 | 5.52 ± 1.06 | 4 × 104 [e] | 12.97 |
| [Ne III] | 3P1 – 3P2 | 15.555 | 29.91 ± 2.33 | 3 × 105 [e] | 40.96 |
| H2 | 0−0 S(1) | 17.035 | 11.93 ± 1.19 | 2 × 104 [H2] | – |
| [P III] | 2P3/2 – 2P1/2 | 17.885 | < 2.02 | 19.77 | |
| [Fe II] | 7D7/2 – 7D9/2 | 17.936 | < 3.10 | 7.90 | |
| [S III] | 3P2 – 3P1 | 18.713 | 97.81 ± 3.78 | 2 × 104 [e] | 23.34 |
| [Ar III] | 3P0 – 3P1 | 21.831 | < 2.00 | 4 × 104 [e] | 27.63 |
| [Fe III] | 5D3 – 5D4 | 22.925 | 10.30 ± 2.23 | 105 [e] | 16.19 |
| [Ne V] | 3P1 – 3P0 | 24.318 | < 1.50 | 3 × 105 [e] | 97.12 |
| [O IV] | 2P3/2 – 1P1/2 | 25.913 | 7.75 ± 4.70 | 1 × 104 [e] | 54.94 |
| [Fe II] | 6D7/2 – 6D9/2 | 25.988 | 21.00 ± 5.15 | 2 × 106 [H], 104 [e] | 7.90 |
| H2 | 0−0 S(0) | 28.221 | < 5.00 | 700 [H2] | – |
| [S III] | 3P1 – 3P0 | 33.480 | 166.00 ± 19.00 | 7 × 103 [e] | 23.34 |
| [Si II] | 2P3/2 – 2P1/2 | 34.814 | 241.00 ± 22.40 | 3 × 105 [H], 103 [e] | 8.15 |
| [Ne III] | 3P0 – 3P1 | 36.014 | < 20.00 | 6 × 104 [e] | 40.96 |
| SOFIA/FIFI-LS | |||||
| [S III] | 3P2 – 3P1 | 51.815 | 43.34 ± 4.17 | 4 × 103 [e] | 35.12 |
| [S III] | 3P1 – 3P0 | 88.356 | 87.60 ± 16.91 | 510 [e] | 35.12 |
| [O I] | 3P0 – 3P1 | 145.525 | 43.01 ± 3.72 | 105 [H] | – |
| [C II] | 3P3/2 – 3P1/2 | 157.741 | 452.95 ± 13.51 | 3 × 103 [H], 50 [e] | 11.26 |
| Herschel/PACS | |||||
| [N III] | 2P3/2 – 2P1/2 | 57.32 | 57.76 ± 40.73 | 3 × 103 [e] | 29.60 |
| [O I] | 3P1 – 3P2 | 63.185 | 372.50 ± 57.59 | 5 × 105 [H] | – |
| [S III] | 3P1 – 3P0 | 88.356 | 74.25 ± 17.19 | 510 [e] | 35.12 |
| [N II] | 3P2 – 3P1 | 121.8 | 94.16 ± 22.28 | 300 [e] | 14.53 |
| [O I] | 3P0 – 3P1 | 145.525 | 43.06 ± 7.104 | 105 [H] | – |
| [C II] | 3P3/2 – 3P1/2 | 157.741 | 380.30 ± 44.61 | 3 × 103 [H], 50 [e] | 11.26 |
| Herschel/SPIRE | |||||
| [N II] | 3P1 – 3P0 | 205.3 | 20.63 ± 2.13 | 45 [e] | 14.53 |
| [C I] | 3P2 – 3P1 | 370.415 | 12.25 ± 1.25 | 2 × 103 [H] | – |
| [C I] | 3P1 – 3P0 | 609.135 | 4.93 ± 0.56 | 300 [H] | – |
Notes. See Sects. 2.1 and 2.2 for data reduction, and Sect. 2.3 for extraction of the nuclear emission. Critical densities from Malhotra et al. (2001), Giveon et al. (2002), Kaufman et al. (2006), Meijerink et al. (2007) and Cormier et al. (2012), calculated at T = 100, 300 and 10 000 K for collisions with H atoms, H2 molecules and electrons, respectively. The critical densities are listed for the main collisional partners. Uncertainties listed are only statistical errors from the fit. In addition, systematic uncertainties are 15% for IRS (Sloan et al. 2015) and PACS (Pérez-Beaupuits et al. 2018), and 20% for FIFI-LS (FIFI-LS team, priv. comm.). Transitions and wavelengths from NIST (Kramida et al. 2020), ionisation potentials to create the ion from Draine (2011).
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