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Table 7

M43, Mon R2, and M17 SW C18O 1–0 column density and equivalent visual extinction and the [12C II] equivalent visual extinction for comparison.

Positions N(C18O) N(H2) AV AV,bg AV,fg
C18O C18O [12C II] [12C II]
(cm−2) (cm−2) (mag) (mag) (mag)
M43 0 1.16E16 4.75E22 50.8 18.3
           
M43 1 1.44E16 5.88E22 62.9 12.9
           
M43 2 1.50E16 6.13E22 65.6 11.2
           
M43 3 1.42E16 5.80E22 62.1 4.9
           
M43 4 9.89E15 4.03E22 43.2 12.0
           
M43 5 7.46E15 3.05E22 32.6 9.0
           
M43 6 8.00E15 3.27E22 34.9 13.4

MonR2 1 8.98E15 3.74E22 40.0 18.7 3.7
MonR2 2 9.99E15 4.16E22 44.5 21.0 2.9

M17SW 0 1.65E16 5.83E22 62.3 41.0 9.2
           
M17SW 1 2.79E16 9.88E22 105.6 35.6 7.6
           
M17SW 2 2.74E16 9.72E22 103.9 24.9 13.4
           
M17SW 3 3.15E16 1.11E23 119.1 19.6 3.5
           
M17SW 4 1.38E16 4.88E22 52.2 33.9 5.8
           
M17SW 5 2.05E15 7.28E21 7.8 13.4 1.7
           
M17SW 6 5.10E15 1.81E22 19.3 34.3 8.0

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