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Table 4
Molecular abundances in M 33 and typical examples of galactic and extra-galactic sources.
| Source | HCO+ | HCN | HNC | C2H | References |
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| M 33 min | − 10.3 | − 9.8 | – | – | |
| M 33 stacked | − 9.8 | − 9.2 | − 10.5 | − 8.4 | |
| M 33 max | − 9.5 | − 9.1 | – | – | |
| LMC N159 | − 9.7 | − 9.7 | − 10.2 | – | 1, 2 |
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| NGC 253 | − 8.8 | − 8.3 | − 9.0 | − 7.7 | 1, 3 |
| M 82 | − 8.4 | − 8.4 | − 8.8 | − 7.6 | 1, 3 |
| IC 342 GMC-A | − 8.7 | − 7.5 | 5 | ||
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| Orion Bar | − 8.5 | − 8.3 | − 9.0 | − 8.7 | 1 |
| TMC-1 | − 8.4 | − 7.7 | − 7.7 | − 7.1 | 1, 6 |
| Transl. Cl. | − 8.7 | − 7.4 | − 8.6 | – | 1, 4 |
Notes. Entries show log (N(X)/N(H2)).
References. (1) Omont (2007); (2) Johansson et al. (1994); (3) Martín et al. (2006); (4) Turner (2000); (5) Meier & Turner (2005) and references therein; (6) Hogerheijde & Sandell (2000).
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