Table 3
(CH2OH)2/CH2OHCHO, CH3OCHO/CH2OHCHO, and CH3OCHO/(CH2OH)2 column density ratios determined in different objects.
| Source | (CH2OH)2/CH2OHCHOa | CH3OCHO/CH2OHCHO | CH3OCHO/(CH2OH)2a | References |
|
|
||||
| Class 0 protostars | ||||
|
|
||||
| NGC 1333 IRAS2A | ~5 | ~20 | ~4 | 1 |
| IRAS 16293-2422 | ~1 | ~13 | ~13 | 2 |
|
|
||||
| Comets | ||||
|
|
||||
| C/1995 O1 (Hale-Bopp) | ≥6 | ≥2 | ~0.3 | 3 |
| C/2012 F6 (Lemmon) | ≥3 | ... | ≤0.7 | 4 |
| C/2013 R1 (Lovejoy) | ≥5 | ... | ≤0.6 | 4 |
|
|
||||
| High– and intermediate–mass star-forming regions | ||||
|
|
||||
| Sgr B2(N) | 0.7–2.2b | ~52c | ~30 | 5, 6, 7 |
| G34.41+0.31 | ... | ≤34 | ... | 8 |
| NGC 7129 FIRS2 | ~2 | ~40 | ~20 | 9 |
|
|
||||
| Molecular clouds in the central molecular zone | ||||
|
|
||||
| G–0.02, G–0.11, and G+0.693 | ~1.2–1.6 | ~3.3–5.2 | ~2.5–4.3 | 10 |
Notes.
Reference. 1) this study; 2) Jørgensen et al. (2012, and in prep.); 3) Crovisier et al. (2004); 4) Biver et al. (2014); 5) Hollis et al. (2001); 6) Hollis et al. (2002); 7) Belloche et al. (2013); 8) Beltrán et al. (2009); 9) Fuente et al. (2014); 10) Requena-Torres et al. (2008).
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