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Table 5.

Median [C II]/[O I] and ([C II]+[O I])/TIR ratios and rms values as observed and after correction for [O I] self absorption.

Region [C II]/[O I] ([C II]+[O I])/TIR Solutions of PDR models
Moderate solution
Low-FUV solution
n G0 n G0
% (cm−3) (cm−3)
Observed ratios
All 4.51 ± 2.58 0.75 ± 0.31 60 20 104 1
Bright, inner 4.79 ± 2.43 0.68 ± 0.19 60 20 104 1
Bright, outer 3.71 ± 3.68 0.72 ± 0.19 30 20 104 1
Weak, inner 3.83 ± 2.54 0.91 ± 0.27 100 30 104 1
Weak, outer 3.01 ± 2.36 1.07 ± 0.54 300 60 104 1

Ratios with corrected [O I]
All 3.0 ± 2.1 0.82 ± 0.53 200 60 104 1.5
Bright, inner 3.06 ± 1.92 0.76 ± 0.2 200 60 104 1.5
Bright, outer 2.78 ± 2.69 0.77 ± 0.18 200 70 104 1.5
Weak, inner 3.27 ± 2.28 0.94 ± 0.89 300 60 104 1.5
Weak, outer 2.46 ± 2.02 1.12 ± 0.55 600 80 104 2.0

#1 4.59 ± 0.97 0.76 ± 0.25 900 20 5 × 103 3.0

Notes. Solutions of the PDR models of Pound & Wolfire (2008), Kaufman et al. (2006) are shown for the median ratio of all positions and for position #1 with one of the highest observed [C II] intensities 1.2 × 10−4 erg s−1 cm−2 sr−1.

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