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Table 5

Best-fitting PDR models.

HCO+/HCN HCN/CO Av nH FUV ΦAva ΦFUVb best χ2c
[%] [mag] [cm-3] [G0 ]
Subsolar metallicity models
Stacked 1.4 ± 0.2 1.0 ± 0.1 8 ± 3 (3 ± 4) × 104 68 ± 24 0.5 ± 0.2 0.3 ± 0.1 0.1 ± 0.1
NO6 2.5 ± 0.2 1.4 ± 0.3 4 ± 2 (6 ± 4) × 103 41 ± 16 1.7 ± 1.1 0.9 ± 0.4 1.4 ± 0.5
NO3 1.9 ± 0.1 0.8 ± 0.2 8 ± 2 (3 ± 2) × 103 27 ± 20 0.7 ± 0.2 0.8 ± 0.6 0.6 ± 0.3
GMC91 1.4 ± 0.3 0.4 ± 0.1 6 ± 2 (1 ± 5) × 104 54 ± 44 0.9 ± 0.3 0.2 ± 0.2 0.1 ± 0.1
NO1 1.4 ± 0.2 1.7 ± 0.4 7 ± 4 (3 ± 4) × 104 42 ± 40 0.3 ± 0.2 0.3 ± 0.3 0.2 ± 0.1
GMC1 1.1 ± 0.1 2.9 ± 0.4 10 ± 3 (1 ± 2) × 104 30 ± 37 0.6 ± 0.2 1.7 ± 2.1 0.7 ± 0.5
GMC26 1.2 ± 0.1 1.0 ± 0.2 9 ± 2 (1 ± 3) × 104 67 ± 24 0.3 ± 0.1 0.2 ± 0.1 0.1 ± 0.1
Solar metallicity models
Stacked 1.4 ± 0.2 1.0 ± 0.1 10 ± 1 (5 ± 1) × 103 47 ± 12 0.4 ± 0.0 0.5 ± 0.1 0.6 ± 0.4
NO6 2.5 ± 0.2 1.4 ± 0.3 2 ± 0 (5 ± 1) × 103 100 ± 4 3.1 ± 0.8 0.4 ± 0.0 3.4 ± 1.2
NO3 1.9 ± 0.1 0.8 ± 0.2 6 ± 3 (2 ± 2) × 103 81 ± 32 0.9 ± 0.5 0.3 ± 0.1 3.4 ± 0.9
GMC91 1.4 ± 0.3 0.4 ± 0.1 4 ± 1 (1 ± 1) × 103 98 ± 11 1.4 ± 0.3 0.1 ± 0.0 0.5 ± 0.4
NO1 1.4 ± 0.2 1.7 ± 0.4 7 ± 4 (5 ± 3) × 103 50 ± 43 0.4 ± 0.2 0.3 ± 0.2 0.2 ± 0.2
GMC1 1.1 ± 0.1 2.9 ± 0.4 11 ± 2 (3 ± 6) × 103 26 ± 34 0.6 ± 0.1 1.9 ± 2.6 0.5 ± 0.2
GMC26 1.2 ± 0.1 1.0 ± 0.2 9 ± 2 (5 ± 1) × 103 52 ± 17 0.2 ± 0.1 0.2 ± 0.1 0.4 ± 0.3

Notes.

(a)

beam-filling factor derived from Av(12CO)/Av(Model);

(b)

beam-filling factor derived from FUV(TIR)/FUV(Model);

(c)

average χ2 of the best-fitting models.

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