Table 1.
Column densities and ratios.
| Species | Ng.s. (×l015) [cm−2] | N Ratio |
|---|---|---|
| CH3OCH3 (DME) | 600 ± 120a,b | |
| CH3CH2OCH3 (tEME) | ≤4.0 ± 0.8a | DME/tEME ≥ 150 |
| CH3CH2OCH2CH3 | ≤1.0 ± 0.2a | DME/Tt-DEE ≥ 600 |
| (Tt-DEE)† | tEME/Tt-DEE ≥ 4 | |
| CH3OCHCH2 | ≤0.5 ± 0.1a | DME/cis-MVE ≥ 1200 |
| (cis-MVE)†† | tEME/cis-MVE ≥ 9 | |
| CH3OCOH (MF) | 240 ± 50a,b,c | |
| CH3CH2OCOH (EF) | 2.0 ± 0.4a,d | MF/EF ≃ 120 |
| CH3OH (MetOH) | 2700 ± 500b,e,f | |
| CH3CH2OH (EtOH) | 60 ± 10b,d,e | MetOH/EtOH ≃ 45 |
| Gt-CH3CH2CH2OH | 1.0 ± 0.2e | MetOH/PropOH ≃ 2700 |
| (PropOH) | EtOH/PropOH ≃ 60 |
Notes.
†
trans-trans diethyl ether.
††
cis methyl vinyl ether.
a
Position A; same physical parameters of the ALMA tEME model (see Sect. 3.1).
b
Three kinetic temperatures: 50 ± 10, 150 ± 30, and 250 ± 75 K.
c
b type lines fitted (a type lines are optically thick); another component has been included to properly fit the observed line profiles (vLSR = +9 km s−1, Δv = 4 km s−1, TK = 150 ± 30 K, Ng.s = (1.0 ± 0.2) × 1017cm−2).
d
trans+gauche.
e
Position B; assuming the same physical parameters of the ALMA Gt-n-propanol model (see Sect. 3.2).
f
12C/13C = 45 (Tercero et al. 2010).