Table 3
Parameters derived from the Boltzmann diagrams.
| Galaxy | Molecule | N | T rot | N/NH2 |
| (cm-2) | (K) | |||
|
|
||||
| NGC 253 | ||||
|
|
||||
| CS† | (4.4 ± 1.8) × 1014 | 4.4 ± 1.1 | 1.1 × 10-8 | |
| (1.5 ± 0.6) × 1014 | 12.0 ± 3 | |||
| (0.7 ± 0.3) × 1014 | 33.1 ± 8.3 | |||
|
|
||||
| HC3N | (8.1 ± 2.9) × 1013 | 11.6 ± 1.8 | 2.2 × 10-9 | |
| (3.6 ± 1.4) × 1013 | 26.1 ± 4.5 | |||
| (2.2 ± 0.7) × 1013 | 73.3 ± 14.0 | |||
|
|
||||
| CH3CCH | (3.2 ± 1.0) × 1014 | 44.4 ± 7.7 | 5.2 × 10-9 | |
|
|
||||
| M 82 | ||||
|
|
||||
| CS | (2.0 ± 0.1) × 1014 | 5.8 ± 0.1 | 3.0 × 10-9 | |
| (3.6 ± 0.5) × 1013 | 15.1 ± 0.9 | |||
|
|
||||
| HC3N | (2.5 ± 1.1) × 1013 | 24.7 ± 3.9 | 3.2 × 10-10 | |
|
|
||||
| CH3CCH | (8.5 ± 0.9) × 1014 | 28.1 ± 1.2 | 1.1 × 10-8 | |
|
|
||||
| IC 342 | ||||
|
|
||||
| CS | (1.4 ± 0.1) × 1014 | 4.7 ± 0.1 | 3.8 × 10-9 | |
| (6.0 ± 0.1) × 1013 | 10.6 ± 0.2 | |||
| (2.3 ± 0.1) × 1013 | 20.1 ± 4.0 | |||
|
|
||||
| HC3N | (2.7 ± 1.1) × 1013 | 13.1 ± 2.3 | 8.6 × 10-10 | |
| (1.6 ± 0.7) × 1013 | 20.6 ± 3.3 | |||
| (7.2 ± 3.2) × 1012 | 70.6 ± 21.2 | |||
|
|
||||
| CH3CCH* | 4.5 × 1014 | 70.0 | 7.8 × 10-9 | |
|
|
||||
| Maffei 2 | ||||
|
|
||||
| CS† | (1.2 ± 1.0) × 1014 | 5.4 ± 4.5 | 4.3 × 10-9 | |
| (6.9 ± 5.7) × 1013 | 9.7 ± 8.1 | |||
|
|
||||
| HC3N | (4.3 ± 0.6) × 1013 | 11.6 ± 0.8 | 9.8 × 10-10 | |
| ≤ 4.4 × 1012 | ≤ 53.1 | |||
|
|
||||
| CH3CCH | (9.0 ± 3.0) × 1013 | 12.8 ± 1.9 | 2.0 × 10-9 | |
| ≤ 1.1 × 1014 | ≤ 46.9 | |||
Notes. Column densities (N) and rotational temperatures (Trot) obtained from the linear fits shown in Fig. 5 for each galaxy and molecule. The last column shows the relative abundances using the total H2 column densities of Table 1. Before comparing, we added up all column densities we obtained for a molecule.
The large errors in both N and Trot reflect the uncertainty in the worst-case scenario due to the different observed positions for the CS lines (see Sect. 3.1);
the obtained values of Trot and NCH3CCH are not reliable for the observed lines because of their large uncertainties (see the corresponding Boltzmann diagram in Fig. 5), so we have adopted Trot = 70 K and calculated NCH3CCH through this value.
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