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Table 4
Relevant column density ratios used for the discussion.
| Molecular ratio | M 83 | NGC 253 | M 82 | M 51 | NGC 1068 | NGC 7469 | Arp 220 | Mrk 231 |
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| HNCO/C18O | 4.3 × 10-3 | 4.3 × 10-3 | 1.0 × 10-3 | ≤ 1.3 × 10-3 | 2.5 × 10-3 | ≤ 9.4 × 10-3 | 2.9 × 10-3 | ≤ 6.1 × 10-3 |
| CH3OH/C18O | 1.7 × 10-2 | 2.5 × 10-2 | 7.9 × 10-3 | 7.5 × 10-3 | 1.9 × 10-2 | ≤ 2.8 × 10-2 | 9.0 × 10-3 | ≤ 5.3 × 10-2 |
| SiO/C18O | 2.2 × 10-4 | 6.1 × 10-4 | 1.7 × 10-4 | ≤ 5.0 × 10-5 | 5.3 × 10-3 | ≤ 2.3 × 10-3 | 1.1 × 10-3 | ≤ 3.5 × 10-3 |
| CH3CN/C18O | 3.1 × 10-4 | 6.5 × 10-4 | 1.8 × 10-4 | ≤ 1.8 × 10-3 | 7.8 × 10-4 | ≤ 2.6 × 10-3 | 1.5 × 10-3 | ≤ 1.8 × 10-3 |
| CH3CCH/C18O | 8.5 × 10-3 | 1.0 × 10-2 | 4.4 × 10-2 | ≤ 1.0 × 10-2 | ≤ 4.4 × 10-3 | ≤ 5.8 × 10-2 | 6.0 × 10-3 | ≤ 8.2 × 10-2 |
| SO/C18O | 1.8 × 10-3 | 3.3 × 10-3 | 3.0 × 10-3 | 2.1 × 10-3 | 1.7 × 10-3 | ≤ 1.1 × 10-2 | ≤ 7.1 × 10-4 | ≤ 1.0 × 10-2 |
| c-C3H2/C18O | ≤ 3.4 × 10-1 | 2.0 × 10-3 | 5.1 × 10-3 | ≤ 3.3 × 10-1 | ≤ 2.1 × 10-1 | ≤ 6.1 × 10-1 | ≤ 7.1 × 10-2 | ≤ 1.1 × 10-2 |
| HCO/C18O | ≤ 4.5 × 10-4 | 1.2 × 10-3 | 2.0 × 10-3 | ≤ 1.3 × 10-3 | 2.0 × 10-3 | ≤ 1.1 × 10-2 | ≤ 9.2 × 10-4 | ≤ 1.6 × 10-2 |
| C2H/C18O | 4.5 × 10-2 | 5.5 × 10-2 | 1.4 × 10-1 | 3.1 × 10-2 | 8.5 × 10-2 | 1.6 × 10-1 | 3.5 × 10-2 | 6.9 × 10-2 |
| N2H+/C18O | 5.9 × 10-4 | 7.8 × 10-4 | 5.1 × 10-4 | 7.9 × 10-4 | 2.5 × 10-3 | ≤ 1.3 × 10-3 | 9.5 × 10-4 | ≤ 1.1 × 10-3 |
| HNC/C18O | 2.8 × 10-3 | 3.5 × 10-3 | 4.4 × 10-3 | 2.6 × 10-3 | 5.4 × 10-3 | 6.6 × 10-3 | 5.2 × 10-3 | 5.1 × 10-3 |
| HCN/C18O | 7.8 × 10-3 | 7.5 × 10-3 | 1.1 × 10-2 | 8.6 × 10-3 | 1.9 × 10-2 | 1.6 × 10-2 | 7.4 × 10-3 | 1.7 × 10-2 |
| CN/C18O | 2.9 × 10-2 | 3.4 × 10-2 | 3.9 × 10-2 | 2.5 × 10-2 | 5.3 × 10-2 | 7.2 × 10-2 | 9.8 × 10-3 | 3.7 × 10-2 |
| HCN/HCO+ | 1.9 | 2.0 | 1.1 | 3.4 | 2.7 | 1.4 | 4.1 | 2.6 |
| CN/HCN | 3.8 | 4.5 | 3.5 | 2.9 | 2.8 | 4.4 | 1.3 | 2.1 |
| HCN/CS | 1.5 | 0.9 | 1.2 | 2.5 | 3.2 | 1.3 | 1.4 | 2.4 |
Notes. The errors of the ratios range in general between 2% and 63% and have an average value of 14%. Exceptions to these values are the ratios involving HNCO and CH3CN in M 82, as their column densities have large errors associated.
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