Table 10
Physical parameters of two-component fitting of the S-F ring at diameter 18′′<D< 45′′, with Likelihood L> 0.8 (see Eq. (1)).
| Parameter | Low-excitation component | High-excitation component | |||||||
|
|
|||||||||
| min | max | best fitting | min | max | best fitting | ||||
|
|
|||||||||
| Density [cm-3] | 102.9 | 103.6 | 103.2 | 103.0 | 105.0 | 104.1 | |||
| Temperature [K] | 15 | 40 | 20 | 15 | 300 | 60 | |||
| dv/dr [kms-1 pc-1] | 6.0 | 40 | 10 | 8.0 | 160 | 40 | |||
| N(CO)beam [1017 cm-2] a | 2.2 | 4.2 | 3.7 | 0.3 | 1.6 | 0.6 | |||
| N(CO)model [1019 cm-2] b | 0.7 | 1.5 | 1.2 | 1.5 | 4.6 | 2.3 | |||
| MH2 [107M⊙] c | 3.8 | 7.5 | 6.4 | 0.6 | 2.3 | 1.0 | |||
| Filling Factor (φA) | 2.4 % | 4.6% | 3.2% | 0.17% | 0.35% | 0.24% | |||
Notes.
MH2 is calculated with 
), where r is the effective radius of the beam, 
412pc.xCO is the CO to H2 abundance, 8 × 10-5 (Frerking et al. 1982). The helium mass is included in MH2 by adopting a factor of 1.36.
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