Table 1.
CH3OH transitions in this study
| Transition | Rest frequency | Eu | Aul | Integrated intensity (GMC 3) | |
|---|---|---|---|---|---|
| [GHz] | [K] | [s−1] | [K km s−1] | ||
| E-CH3OH | 2−1 − 1−1 | 96.739360 | 12.5 | 2.558E-06 | 111±17 |
| E-CH3OH | 20 − 10 | 96.744550 | 20.1 | 3.407E-06 | |
| E-CH3OH | 21 − 11 | 96.755500 | 28.0 | 2.624E-06 | |
| A-CH3OH | 20 − 10 | 96.741370 | 7.0 | 3.408E-06 | |
| A-CH3OH | 2−1 − 1−1 | 97.582800 | 21.6 | 2.626E-06 | 8.4±1.3 |
| A-CH3OH | 31 − 40 | 107.013830 | 28.3 | 3.066E-06 | 6.7±1.0 |
| A-CH3OH | 31 − 21 | 143.865790 | 28.3 | 1.069E-05 | 12.7±1.9 |
| A-CH3OH | 3−1 − 2−1 | 146.368330 | 28.6 | 1.125E-05 | 13.3±2.0 |
| A-CH3OH | 21 − 30 | 156.602400 | 21.4 | 8.926E-06 | 13.5±2.0 |
| E-CH3OH | 70 − 7−1 | 156.828520 | 78.1 | 1.878E-05 | 2.8±0.4 |
| E-CH3OH | 40 − 4−1 | 157.246060 | 36.3 | 2.098E-05 | 120±18 |
| E-CH3OH | 10 − 1−1 | 157.270830 | 15.4 | 2.206E-05 | |
| E-CH3OH | 30 − 3−1 | 157.272340 | 27.1 | 2.146E-05 | |
| E-CH3OH | 20 − 2−1 | 157.276020 | 20.1 | 2.182E-05 | |
| E-CH3OH | 11 − 10 | 165.050170 | 23.4 | 2.349E-05 | 76±11 |
| E-CH3OH | 21 − 20 | 165.061130 | 28.0 | 2.343E-05 | |
| E-CH3OH | 146 − 155 | 165.074350 | 422.4 | 5.365E-06 | |
| E-CH3OH | 31 − 30 | 165.099240 | 35.0 | 2.333E-05 | |
| E-CH3OH | 41 − 40 | 165.190470 | 44.3 | 2.321E-05 | 22.0±3.3 |
| E-CH3OH | 51 − 50 | 165.369340 | 55.9 | 2.308E-05 | 11.5±1.7 |
| E-CH3OH | 61 − 60 | 165.678650 | 69.8 | 2.295E-05 | 5.6±0.9 |
| E-CH3OH | 32 − 21 | 170.060590 | 36.2 | 2.552E-05 | 30.6±4.6 |
| A-CH3OH | 4−1 − 3−1 | 195.146790 | 38.0 | 2.917E-05 | 14.8±2.2 |
| A-CH3OH | 11 − 20 | 205.791270 | 16.8 | 6.277E-05 | 13.5±2.0 |
| A-CH3OH | 5−1 − 4−1 | 243.915790 | 49.7 | 5.966E-05 | 12.1±1.8 |
| E-CH3OH | 52 − 41 | 266.838150 | 57.1 | 7.736E-05 | 16.0±2.4 |
| A-CH3OH | 61 − 51 | 287.670770 | 62.9 | 1.006E-04 | 7.3±1.1 |
| A-CH3OH | 6−1 − 5−1 | 292.672890 | 63.7 | 1.060E-04 | 7.6±1.1 |
| E-CH3OH | 30 − 2−1 | 302.369770 | 27.1 | 4.661E-05 | 20.3±3.0 |
| A-CH3OH | 1−1 − 10 | 303.366920 | 16.9 | 2.263E-04 | 36.0±5.4 |
| A-CH3OH | 2−1 − 20 | 304.208350 | 21.6 | 2.116E-04 | 44.7±6.7 |
| A-CH3OH | 3−1 − 30 | 305.473490 | 28.6 | 1.632E-04 | 44.1±6.6 |
| E-CH3OH | 31 − 20 | 310.192990 | 35.0 | 8.800E-05 | 27.4±4.1 |
| A-CH3OH | 6−1 − 60 | 311.852610 | 63.7 | 1.712E-04 | 14.0±2.0 |
| A-CH3OH | 7−1 − 70 | 314.859530 | 80.1 | 1.749E-04 | 8.5±1.3 |
| E-CH3OH | 62 − 51 | 315.266860 | 71.0 | 1.183E-04 | 9.9±1.5 |
| A-CH3OH | 71 − 61 | 335.582020 | 79.0 | 1.628E-04 | 3.8±0.6 |
| A-CH3OH | 11 − 00 | 350.905100 | 16.8 | 3.315E-04 | 33.2±5.0 |
| E-CH3OH | 41 − 30 | 358.605800 | 44.3 | 1.319E-04 | 21.6±3.2 |
Notes. Frequencies and spectroscopic parameters have been extracted from the JPL catalogue (Pickett et al. 1998). The available data for CH3OH are from Xu et al. (2008). Note that only transitions covered within ±150 km s−1 with respect to the main transition are listed as shown with vertical lines in Figures A.1 and A.2 – these are considered to be the ‘contributors’ of the velocity-integrated intensities measured from the moment-0 maps. It is worth noting that around 165 GHz, the methanol transition with Eu = 422 K will only contribute significantly if Tkin > 100 K. The main line refers to transitions with the lowest Eu in each frequency group. Measured integrated intensity values and their uncertainties for GMC 3 are provided as a reference. Integrated intensities measured towards the GMCs listed in Table 3 are available as a machine-readable table https://doi.org/10.5281/zenodo.15442733.
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