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Table 4
Summary of physical constraints from modeling results.
| CO emission | Conditions | Model | Comments |
|---|---|---|---|
| c rowspan="0" c>0 * [0pt] | T < 1500 K, NCO < 1018 cm−2 | Slab LTE | Fig. 3 |
| T = 400−1300 K, 1014 < NCO < 1018 cm−2 | RADEX | Fig. 4 | |
| v2∕v1 < 0.2 and | No CO in dust free gas | Slab LTE, RADEX | Sect. 3.5 |
| RCO < 5 | g∕d ≲ 1000 | DALI | Fig. 12 |
| No CO at the inner rim | DALI | Sect. 4.3 and Fig. 12 | |
| Radially constrained emitting area | DALI | Sect. 4.3 and Figs. 2, C.1 and 10 | |
| T ≲ 300 K, NCO > 1018 cm−2 or | c rowspan="0" c>0 * [0pt]Slab LTE, RADEX | c rowspan="0" c>0 * [0pt]Figs. 3, 4 and 6 | |
| v2∕v1 > 0.2 and | T ≳ 1000 K, NCO < 1014 cm−2 | ||
| RCO > 5 | g∕d > 10 000 | DALI | Figs. 9 and F.1 |
| Rounded edge, Tgas < 300 K, NCO > 1020 cm−2 | DALI | Sect. F | |
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