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Table 4
Parameters obtained with our LVG code for CS and HC3N, and the Mauersberger et al. (1991) LVG model for CH3CCH.
| Galaxy | T kin | Molecule | n(H2) | N | NLTE / Nnon − LTE | ||||
| (cm-3) | (cm-2) | ||||||||
|
|
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| NGC 253 | 120 K | ||||||||
|
|
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| CS | (1.7 ± 0.6) × 104 | (7.3 ± 1.7) × 1014 | 0.6 | ||||||
| (3.1 ± 1.4) × 105 | (1.3 ± 0.3) × 1014 | 1.1 | |||||||
| (1.4 ± 0.7) × 106 | (8.0 ± 2.0) × 1013 | 0.9 | |||||||
|
|
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| HC3N | (2.0 ± 0.8) × 104 | (7.2 ± 1.1) × 1013 | 1.1 | ||||||
| (1.2 ± 0.4) × 105 | (2.6 ± 0.5) × 1013 | 1.4 | |||||||
| (2.9 ± 1.3) × 105 | (1.7 ± 0.3) × 1013 | 1.3 | |||||||
|
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| CH3CCH | ∼ 105 | ... | ... | ||||||
| ∼ 106 | ... | ... | |||||||
|
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| M 82 | 30 K | ||||||||
|
|
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| CS | (1.1 ± 0.4) × 105 | (3.2 ± 1.4) × 1014 | 0.6 | ||||||
| (2.3 ± 1.6) × 106 | (3.6 ± 1.3) × 1013 | 1.0 | |||||||
|
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| HC3N | (1.7 ± 1.3) × 106 | (1.9 ± 0.6) × 1013 | 1.4 | ||||||
|
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| CH3CCH | ∼ 105 | ... | ... | ||||||
|
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| IC 342 | 53 K | ||||||||
|
|
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| CS | (3.3 ± 1.4) × 104 | (2.5 ± 0.9) × 1014 | 0.6 | ||||||
| (3.4 ± 1.8) × 105 | (6.2 ± 1.2) × 1013 | 1.0 | |||||||
| (1.2 ± 0.4) × 106 | (1.9 ± 0.5) × 1013 | 1.2 | |||||||
|
|
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| HC3N | (6.7 ± 2.0) × 104 | (2.4 ± 0.6) × 1013 | 1.1 | ||||||
| (1.5 ± 0.5) × 105 | (1.5 ± 0.3) × 1013 | 1.1 | |||||||
| (2.8 ± 0.6) × 105 | (9.1 ± 1.3) × 1012 | 0.8 | |||||||
|
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| CH3CCH | ∼ 105 | ... | ... | ||||||
| ∼ 106 | ... | ... | |||||||
|
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| Maffei 2 | 48 K | ||||||||
|
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| CS | (1.3 ± 0.4) × 104 | (5.2 ± 1.5) × 1014 | 0.2 | ||||||
| (3.8 ± 1.1) × 105 | (4.6 ± 0.9) × 1013 | 1.5 | |||||||
|
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| HC3N | (3.4 ± 2.9) × 105 | (1.5 ± 0.4) × 1013 | 2.9 | ||||||
|
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| CH3CCH | ∼ 104 | ... | ... | ||||||
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| Maffei 2 | 132 K | ||||||||
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| CS | (4.5 ± 1.4) × 104 | (8.7 ± 2.8) × 1014 | 0.1 | ||||||
| (1.8 ± 0.6) × 105 | (4.6 ± 0.9) × 1013 | 1.5 | |||||||
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| HC3N | (1.3 ± 1.1) × 105 | (1.5 ± 0.5) × 1013 | 2.9 | ||||||
|
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| CH3CCH | ... | ... | ... | ||||||
Notes. The last column reflects the ratio between the column densities obtained by both LTE and non-LTE approaches.
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