Open Access
Table 3
Observed and modelled column densities for L183.
| Species | Column density (cm−2) | |||
|---|---|---|---|---|
| Observed | “Model 1” | “Model 2” | “Model 3” | |
| SO | 6.0 × 1014 | 3.2 × 1014 | 5.4 × 1014 | 3.7 × 1014 |
| OCS | 7.4 × 1012 | 1.9 × 1012 | 1.5 × 1011 | 3.2 × 1012 |
| H2CS | 1.7 × 1012 | 1.3 × 1013 | 1.4 × 1013 | 1.3 × 1013 |
| SO2 | 3.5 × 1012 | 1.6 × 1014 | 9.5 × 1014 | 2.2 × 1014 |
| CS | 7.8 × 1012 | 1.8 × 1013 | 2.6 × 1012 | 2.5 × 1013 |
| HCS+ | 1.8 × 1011 | 2.9 × 1010 | 2.3 × 1010 | 2.9 × 1010 |
| CH3OCHO | 1.2 × 1012 | 5.5 × 1010 | 1.8 × 1011 | 1.2 × 1011 |
| HCOOH | 1.4 × 1012 | 9.1 × 1012 | 2.0 × 1012 | 8.9 × 1012 |
| CH3CHO | 2.7 × 1012 | 3.6 × 1013 | 9.9 × 1011 | 1.5 × 1012 |
| CH3CCH | 3.4 × 1012 | 1.1 × 1013 | 1.1 × 1012 | 1.5 × 1013 |
| CH3OH | 4.9 × 1013 | 2.2 × 1014 | 5.2 × 1013 | 3.5 × 1014 |
| H2CCO | 1.1 × 1012 | 2.7 × 1013 | 5.8 × 1011 | 7.4 × 1012 |
| N2H+ | 1.2 × 1013 | 3.8 × 1012 | 5.9 × 1012 | 2.5 × 1012 |
| CCH | 3.8 × 1013 | 5.1 × 1013 | 3.7 × 1012 | 4.9 × 1013 |
| C4H | 4.2 × 1013 | 4.2 × 1013 | 1.1 × 1013 | 4.5 × 1013 |
| HNCO | 5.8 × 1012 | 8.0 × 1011 | 2.1 × 1012 | 8.5 × 1011 |
| HC3N | 7.3 × 1012 | 4.9 × 1012 | 1.0 × 1010 | 4.1 × 1012 |
| HCO+ | 2.9 × 1013 | 1.7 × 1013 | 8.8 × 1012 | 1.5 × 1013 |
| HOCO+ | 4.4 × 1011 | 9.9 × 1010 | 3.0 × 1011 | 7.1 × 1010 |
| CO | 8.5 × 1017 | 5.6 × 1017 | 7.1 × 1016 | 6.7 × 1017 |
| HCN | 6.0 × 1013 | 5.4 × 1013 | 6.2 × 1012 | 6.2 × 1013 |
| C3O | 7.6 × 1011 | 6.0 × 1011 | 1.5 × 1010 | 8.7 × 1011 |
Notes. In bold are the modelled column densities not in agreement with the observed values. Where the observed column density was derived for two excitation temperatures (see Table B.2), the 5 K value was considered here.
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