Open Access
Table 4
Comparison of column densities determined from RADEX and LTE analyses.
| Species | non-LTE (RADEX) | LTE | ||
|---|---|---|---|---|
| Tk (K) | n(H2) (cm−3) | N(X) (cm−2) | N(X) (cm−2) | |
| 12CO | 80 | 104 | 7.8 × 1018 | 1.3 × 1019 |
| 13CO | 80 | 104 | 3.6 × 1017 | 2 × 1017 |
| N2H+ | 30 | 3.7 105 | 1 × 1014 | 5.2 × 1014 |
| HCN | 30 | 1.5 × 105 | 1 × 1015 | 1.7 × 1015 |
| HCO+ | 30 | 3.2 × 104 | 5 × 1014 | 7 × 1014 |
| H13CO+ | 30 | 1.8 × 105 | 7 × 1012 | 9.3 × 1012 |
| HNC | 30 | 8 × 104 | 4.2 × 1014 | 2.2 × 1014 |
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