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Table 2

Spitzer and Herschel line fluxes.

Line Wavelength Fluxa Uncertainty Excit. potentialb Excit. temperaturec Critical densityd
(μm) (10-16 W m-2) (10-16 W m-2) (eV) (K) (cm-3)
Spitzer/IRS
 [S iv]  10.51 5.37 0.66 34.79 1 369 5×104 [e]
 [Ne ii]  12.81 3.53 0.43 21.56 1 123 7×105 [e]
 [Ne iii]  15.56 12.3 1.5 40.96 925 3×105 [e]
 [S iii]  18.71 5.79 0.72 23.34 769 2×104 [e]
 [S iii]  33.48 5.85 0.69 ′′ 430 7×103 [e]
 [Si ii]  34.82 6.21 0.75 8.15 413 3×105 [H], 1 ×103 [e]
Humphreys α 12.37 0.208 0.045 13.60 1 163 –
H2 (0,0) S(0) 28.22  <0.62 – 4.48 510 7×102 [H]
H2 (0,0) S(1) 17.03 0.168 0.055 ′′ 1015 2×104 [H]
H2 (0,0) S(2) 12.28 0.101 0.013 ′′ 1682 2×105 [H]
H2 (0,0) S(3) 9.66 0.121 0.018 ′′ 2504 9×105 [H]
 [Fe iii]  22.93 0.54 0.20 16.19 627 1×105 [e]
 [O iv]  25.89 0.49 0.18 54.94 555 1×104 [e]
 [Fe ii]  25.99  <0.25 – 7.90 554 2×106 [H], 1 ×104 [e]
 [Ar iii]  8.99 0.99 0.33 27.63 2 060 3×105 [e]
 [Ar ii]  6.99 0.60 0.15 15.76 1 600 4×105 [e]
 [Ne v]  14.32  <0.080 – 97.12 592 3×104 [e]
Herschel/PACS
 [C ii]  157.74 7.4 2.2 11.26 91 3 ×103 [H], 50 [e]
 [O iii]  88.36 18.0 5.4 35.12 163 5×102 [e]
 [O i]  63.18 6.7 2.0 – 228 5×105 [H]
 [O i]  145.52 0.56 0.17 – 99 1×105 [H]
 [N iii]  57.32 2.50 0.78 29.60 251 3×103 [e]
 [N ii]  121.9 0.31 0.10 14.53 118 3×102 [e]
 [N ii]  205.18  <0.29 – ′′ 70 45 [e]

Notes. The ISO/LWS fluxes can be found in Bergvall et al. (2000), Brauher et al. (2008), and Vasta et al. (2010). [e] with electrons (T = 10 000 K). Values are from Malhotra et al. (2001), Giveon et al. (2002), and Kaufman et al. (2006).

(a)

Upper limits are given as the 3-σ uncertainty from the line fit.

(b)

Excitation potential. Energy to create an ion. For H2, it is the energy to photodissociate the molecule.

(c)

Excitation temperature. Temperature T = ΔE/k required to populate the transition level.

(d)

Critical density ncrit noted [H] for collisions with hydrogen atoms (T = 100 K and T = 300 K for the H2 lines),

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