Table 2
Physical properties of the emitting and absorbing layers along the ring of RCW 120 from CO (3 →2).
| Background | Foreground | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Region | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) |
| A | τCO, bg | NCO,bg |  |
 |
LCO,bg | τCO, fg | NCO,fg |  |
 |
LCO,fg | |
| (pc2) | (1018 cm−2) | (1021 cm−2) | (M⊙) | (L⊙) | (1018 cm−2) | (1021 cm−2) | (M⊙) | (L⊙) | |||
| Cluster 1 | 9.9 | 9.0 | 0.4 | 4.3 | 685.0 | 2.5 | 1.7 | 0.2 | 1.8 | 284.0 | 0.1 |
| Cluster 2 | 6.2 | 23.4 | 0.9 | 10.5 | 1035.0 | 2.0 | 1.7 | 0.2 | 1.8 | 180.0 | 0.1 |
| Cluster 3 | 15.7 | 4.0 | 0.2 | 2.2 | 561.0 | 3.5 | 1.9 | 0.2 | 1.9 | 491.0 | 0.2 |
| Cluster 4 | 11.2 | 1.4 | 0.1 | 0.9 | 169.0 | 1.7 | 2.4 | 0.1 | 1.7 | 310.0 | 0.1 |
| Cluster 5 | 6.3 | 9.5 | 0.4 | 5.0 | 510.0 | 1.9 | 1.8 | 0.2 | 2.0 | 205.0 | 0.1 |
Notes. (1) Cluster size of the regions defined by the GMM. (2), (7) CO (3 →2) peak opticaldepth. (3), (8) CO column density, determined using Eq. (22). (4), (9) Molecular hydrogen column density, using CO/H2 = 8.5 × 10−5 (Tielens 2010). (5), (10) Molecular hydrogen mass of the layers. (6), (11) Luminosity for the background and foreground layers.
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