Table 3
Column densities predicted by the best-fit model with uFUV = 1700 G0 (see text).
| Species | Nmol (cm-2) | ||
|
|
|||
| observed | modelled (ISM) | modelled (Orion) | |
|
|
|||
| H2 | – | 6.1 × 1019 | 3.1 × 1019 |
| H3+ | – | 1.5 × 1012 | 2.4 × 1012 |
| OH+ | (2.4 ± 0.4) × 1013 | 2.9 × 1013 | 6.1 × 1013 |
| H2O+ | (7.6 ± 1.9) × 1012 | 7.5 × 1012 | 7.2 × 1012 |
| H3O+ | <8.0 × 1011 | 3.5 × 1011 | 1.2 × 1011 |
| C+ | – | 2.5 × 1017 | 3.8 × 1017 |
| C | – | 1.0 × 1013 | 7.0 × 1012 |
| CO+ | – | 7.5 × 107 | 6.1 × 107 |
| CO | – | 3.1 × 109 | 7.4 × 108 |
| HCO+ | – | 1.4 × 108 | 3.7 × 107 |
| CH | – | 4.7 × 108 | 2.6 × 108 |
| CH+ | (3.4 ± 4.5) × 1013 | 7.7 × 1010 | 1.3 × 1011 |
| C2H | – | 3.0 × 103 | 2.8 × 102 |
| N2H+ | – | 1.1 × 105 | 1.3 × 105 |
| CN | – | 2.4 × 106 | 1.2 × 106 |
| HCN | – | 2.7 × 103 | 1.3 × 103 |
| HNC | – | 4.0 × 102 | 6.6 × 101 |
| HF | (1.2 ± 3.4) × 1013 | 7.1 × 1011 | 2.9 × 1011 |
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