Table 2
Column densities of CH3OH and abundance fractions (%) with respect to CH3OH for all COM rich sources.
| B1-c | S68N | B1-bS | |||||
|---|---|---|---|---|---|---|---|
| Species | Name | Band 3 | Band 6 | Band 3 | Band 6 | Band 3 | Band 6 |
| CH3OH | Methanol | 18 ± 4 | 19 ± 6 | 3.6 ± 0.8 | 14 ± 6 | 2.4 ± 0.7 | 5.0 ± 0.6 |
| 13CH3OH | ≡1.43 | 1.0 ± 0.3 | ≡1.43 | 0.7 ± 0.3 | ≡1.43 | 0.3 ± 0.1 | |
CH OH |
<1.0 | ≡0.18 | <2.8 | ≡0.18 | <4.2 | ≡0.18 | |
| CH2DOH | 5.7 ± 2.1 | 8.4 ± 2.8 | <13 | 4.3 ± 1.9 | <9.9 | <4.7 | |
| CH3CH2OH | Ethanol | 1.6 ± 0.9 | 0.8 ± 0.3 | <5.6 | 0.22 ± 0.09 | <8.3 | <0.6 |
| CH3CHO | Acetaldehyde | 1.3 ± 0.5 | 0.2 ± 0.1 | <1.4 | 0.07 ± 0.03 | <2.1 | 0.13 ± 0.02 |
| CH3OCHO | Methyl formate | 2.3 ± 1.0 | 1.0 ± 0.3 | 0.29 ± 0.07 | 1.1 ± 0.5 | 6.1 ± 1.8 | 0.75 ± 0.10 |
| CH3OCH3 | Dimethyl ether | 1.0 ± 0.2 | 1.3 ± 0.4 | 1.8 ± 0.4 | 0.9 ± 0.4 | 4.3 ± 1.2 | 1.3 ± 0.2 |
| CH3COCH3 | Acetone | <2.8 | 0.4 ± 0.1 | <14 | 0.4 ± 0.2 | <21 | 0.10 ± 0.03 |
| aGg’(CH2OH)2 | Ethylene glycol | <2.4 | 0.3 ± 0.1 | <12 | 0.16 ± 0.07 | <18 | <0.43 |
| gGg’(CH2OH)2 | <1.2 | 0.4 ± 0.1 | <6 | <0.81 | <8.9 | <0.43 | |
| CH2OHCHO | Glycolaldehyde | <0.89 | 0.11 ± 0.04 | <2.2 | <0.06 | <3.3 | <0.064 |
| H2CCO | Ketene | – | 0.07 ± 0.02 | – | 0.07 ± 0.03 | – | 0.03 ± 0.01 |
| t-HCOOH | Formic acid | 0.5 ± 0.1 | 0.04 ± 0.02 | <1.4 | 0.07 ± 0.03 | <4.2 | <0.1 |
Notes. The CH3 OH entry is the column density in 1017 cm−2 in a 0.45″ beam derived from 13CH3OH for Band 3 and CH
OH for Band 6 using 12C∕13C = 70 and 16O ∕18O = 560, respectively. All other entries are abundances with respect to CH3OH (in %). The errors are derived from the 2σ (95%) uncertainties on the column densities. Abundance ratios set to their respective isotope ratio are indicated with a ≡ symbol.
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