Table 2
Results of the spectral analysis.
| Species | Tex (K) | N (1017 cm−2) | X (10−8) | FWHM (km s−1) | V − V0 (km s−1) |
|---|---|---|---|---|---|
| O-bearing species | |||||
| CH3OH vt = 1 | 208 ± 24 | 100 ± 12 | 100 ± 30 | 8.3 ± 0.4 | 0.94 ± 0.15 |
| 13CH3OH | 152 ± 20 | 9.6 ± 1.7 | 10±3 | 7.2 ± 0.3 | 1.09 ± 0.10 |
 |
153 ± 20 | 2.4 ± 0.4 | 2.4 ± 0.7 | 7.0(a) | 1.28 ± 0.13 |
| CH3OH(b) | 800 ± 130 | 800 ± 200 | |||
| CH3CHO | 82 ± 20 | 0.34 ± 0.16 | 0.34 ± 0.18 | 7.5(a) | 0.45 ± 0.11 |
| CH3OCH3 | 98 ± 11 | 8.1 ± 1.0 | 8 ± 2 | 7.0(a) | 1.07 ± 0.06 |
| CH3COCH3 | 170 ± 21 | 5.6 ± 1.3 | 5.6 ± 1.4 | 7.0(a) | 0.84 ± 0.06 |
| C2H5OH | 119 ± 14 | 4.7 ± 0.6(c) | 4.7 ± 1.2(c) | 7.02 ± 0.09 | 1.00 ± 0.04 |
| aGg′-(CH2OH)2 | 120(a) | 1.45 ± 0.17 | 1.5 ± 0.4 | 7.2(a) | 0.48 ± 0.06 |
| gGg′-(CH2OH)2 | 120 ± 28 | 0.87 ± 0.19 | 0.9 ± 0.3 | 7.2(a) | 1.0 ± 0.2 |
| N-bearing species | |||||
| CH3CN v8 = 1 | 197 ± 51 | 3.2 ± 0.9 | 3.2 ± 1.1 | 8.6 ± 0.3 | 0.68 ± 0.15 |
| 13CH3CN | 111 ± 17 | 0.073 ± 0.011 | 0.073 ± 0.019 | 7.1 ± 0.2 | 0.95 ± 0.09 |
 |
54±10 | 0.069 ± 0.011 | 0.069 ± 0.018 | 7.2 ± 0.5 | 0.97 ± 0.19 |
| CH3CN(d) | 2.7 ± 0.4 | 2.7 ± 0.7 | |||
| C2H3CN | 104 ± 17 | 0.21 ± 0.04 | 0.21 ± 0.06 | 9.7(a) | 1.05 ± 0.15 |
| C2H5CN | 83 ± 10 | 0.56 ± 0.08(e) | 0.56 ± 0.14(e) | 7.94 ± 0.13 | 1.37 ± 0.06 |
 |
126 ± 37 | 0.042 ± 0.012(f) | 0.042 ± 0.017(f) | 6.0(a) | 1.8 ± 0.3 |
| C2H5CN(g) | 1.6 ± 0.5 | 1.6 ± 0.7 | |||
Notes. Excitation temperature, Tex; column density, N; abundance with respect to H2, X; FWHM; and velocity with respect to V0 = 96.5km s−1, V − V0. The abundances were calculated using 
(Mininni et al. 2020); to calculate the corrected values of column densities and abundances of a species from the analysis of its 13C or 18O isotopolog, we used the ratios 12C/13C = 37 ± 12 (from Yan et al. 2019) and 16O/18O = 333 ± 143 (from Wilson & Rood 1994), considering the galactocentric distance of G31, DGC = 5.02 kpc;(a) quantity kept fixed during the fitting;(b) corrected values for column density and abundance derived from the values of 
;(c) corrected for the partition function factor at 119 K of 1.13; (d) corrected values for column density and abundance derived from the values of 13CH3CN (the estimate using the 
would give corrected N = (2.6 ± 0.4) × 1017 cm−2 and X = 2.6 ± 0.7);(e) corrected for the partition function factor at 83 K of 1.062;(f) corrected for the partition function factor at 126 K of 1.24;(g) corrected values for column density and abundance derived from the values of 
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