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Table 7
Relative abundances of COMs in comets, star-forming regions and Galactic Center quiescent clouds.
| Source | [EG/GA] | [EG/ET] | [GA/MF] | [ET/DME] | [DME/MF] | Luminosity (L⊙) | Reference |
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| Comets | |||||||
| Hale-Bopp | >6 | >2.5 | <0.5 | – | – | – | 1 |
| Lemmon | >3 | >2.2 | a | – | – | – | 6 |
| Lovejoy | 4 | 0.6 | 0.2 | – | – | – | 14 |
| 67P | 0.5 | – | – | – | – | – | 13 |
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| Low-mass star-forming regions (hot corinos) | |||||||
| IRAS 16293-2422 | 1 | – | 0.08 | – | – | 2.7 | 5 |
| NGC 1333 IRAS 2A | 5 | 0.2 | 0.05 | 1.3 | 0.9 | 20 | 7, 9, 10 |
| NGC 1333 IRAS 4A | – | – | 0.17 | 1.4 | 0.6 | 7.7 | 10 |
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| Intermediate-mass star-forming regions | |||||||
| NGC 7129 FIRS2 | 2 | 0.08 | 0.04 | 0.75 | 1.2 | 5 × 102 | 8 |
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| High-mass star forming regions (hot cores) | |||||||
| G31.41+0.31 | 10 | 1.0 | 0.06 | 0.3 | 2.0 | 1.8 × 105 | 3, 15 |
| W51 e2 | >15 | 0.19 | <0.0018 | 0.13 | 1.1 | 4.7 × 106 | 12 |
| G34.3+0.2 | >6 | 0.13 | <0.005 | 0.23 | 1.1 | 2.8 × 105 | 12 |
| Orion KL | >13 | 0.18 | <0.0022 | – | – | 1 × 105 | 4, 11 |
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| Galactic Center quiescent clouds | |||||||
| G-002 | 1.3 | 0.33 | 0.3 | – | – | – | 2 |
| G-001 | 1.6 | 0.47 | 0.23 | – | – | – | 2 |
| G+0.693 | 1.2 | 0.35 | 0.19 | – | – | – | 2 |
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