Table 1.
Spectroscopic parameters and line fit results over the whole emission (high + low components) of CH3CN and CH3OH.
| Frequency | Transition | Eup | log(Aij/s−1) | gup | Iint [R1] | Iint [R2] | Iint [B1] | Iint [B2] |
|---|---|---|---|---|---|---|---|---|
| (GHz) | (K) | (K km s−1) | (K km s−1) | (K km s−1) | (K km s−1) | |||
| CH3CN | ||||||||
| 110.3835 | 60 − 50 A | 18.5 | –3.954 | 26 | 3.43 (0.11) | 2.94 (0.11) | 2.43 (0.06) | 2.29 (0.06) |
| 110.3814 | 61 − 51 E | 25.7 | –3.966 | 26 | 2.77 (0.09) | 2.36 (0.09) | 2.02 (0.06) | 2.11 (0.07) |
| 110.3750 | 62 − 52 E | 47.1 | –4.005 | 26 | 1.62 (0.07) | 1.36 (0.05) | 1.00 (0.07) | 1.09 (0.05) |
| 110.3644 | 63 − 53 A | 82.8 | –4.079 | 26 | 1.65 (0.18) | 1.28 (0.13) | 1.03 (0.06) | 1.07 (0.06) |
| N (cm−2) | – | – | – | – | 3.1 (0.4) × 1013 | 2.6 (0.3) × 1013 | 2.0 (0.2) × 1013 | 2.2 (0.2) × 1013 |
| T (K) | – | – | – | – | 55 (8) | 53 (7) | 50 (6) | 55 (7) |
| CH3OH | ||||||||
| 261.8057 | 2−1, 1 − 10, 1 E | 28.0 | –4.2539 | 20 | 10.4 (0.4) | 9.6 (0.4) | 9.1 (0.2) | 10.6 (0.8) |
| N (cm−2)b | – | – | – | – | 4.6 (0.7) × 1015 | 4.6 (0.7) × 1015 | 3.6 (0.5) × 1015 | 4.7 (0.6) × 1015 |
| CH3OH/CH3CN | – | – | – | 119–179 | 117–177 | 151–213 | 177–247 | |
Notes. aFrequencies and spectroscopic parameters are from Cazzoli & Puzzarini (2006) for CH3CN and Sastry et al. (1984) for CH3OH, extracted from the Cologne Database for Molecular Spectroscopy (Müller et al. 2001, 2005; Endres et al. 2016). bAssuming the same temperature as CH3CN.
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