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Table 2
Comparison of the column densities and abundances of ethylene glycol and related molecules in interstellar sources and comets.
| Molecule | Column densitya | Abundancea | ||||
| (cm-2) | (%H2O) | |||||
| Orion-KL | Sgr B2 | NGC 7129 | C/1995 O1 | C/2012 F6 | C/2013 A1 | |
| (Hale-Bopp) | (Lemmon) | (Lovejoy) | ||||
|
|
||||||
| (CH2OH)2 | 4.6 × 1015 | 2.3 × 1015 | 2.0 × 1015 | 0.25 | 0.24 | 0.35 |
| CH3OH | 4.2 × 1018 | 5.6 × 1018 | 3.4 × 1020 | 2.4 | 1.6 | 2.6 |
| CH3CH2OH | 2.5 × 1016 | 2.1 × 1016 | 3.0 × 1018 | ≤0.1 | ≤0.11 | ≤0.14 |
| CH2OHCHO | ≤ 3.5 × 1014 | 1.8 × 1015 | 1.0 × 1015 | ≤0.04 | ≤0.08 | ≤0.07 |
|
|
||||||
| Relative abundance with respect to methanol | ||||||
| (CH2OH)2 | 1.1 × 10-3 | 0.4 × 10-3 | 0.006 × 10-3 | 0.1 | 0.15 | 0.13 |
| CH3OH | 1 | 1 | 1 | 1 | 1 | 1 |
| CH3CH2OH | 6 × 10-3 | 4 × 10-3 | 9 × 10-3 | ≤0.04 | ≤0.07 | ≤0.05 |
| CH2OHCHO | ≤ 0.08 × 10-3 | 0.3 × 10-3 | 0.003 × 10-3 | ≤0.02 | ≤0.05 | ≤0.03 |
Notes.
(a)
See Sect. 4.1 for references.
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