Table 1.
CH3OH transitions used in this study, ordered by rest frequencies.
| Transition | Rest frequency | Eu | gu | Aul | Spatial resolution | mJy beam−1 to K |
|---|---|---|---|---|---|---|
| [GHz] | [K] | [s−1] | [″] | |||
| E-CH3OH JK = 2−1 − 1−1 | 96.739358 | 12.5 | 5 | 2.557794 × 10−6 | 0.75 × 0.62 | 0.28 |
| A-CH3OH JK = 20 − 10 | 96.741371 | 7.0 | 5 | 3.408015×10−6 | – | – |
| E-CH3OH JK = 20 − 10 | 96.744545 | 20.1 | 5 | 3.407341 × 10−6 | – | – |
| E-CH3OH JK = 21 − 11 | 96.755501 | 28.0 | 5 | 2.624407 × 10−6 | – | – |
| E-CH3OH JK = 30 − 20 | 145.093754 | 27.1 | 7 | 1.231417 × 10−5 | 0.49 × 0.40 | 0.30 |
| E-CH3OH JK = 3−1 − 2−1 | 145.097435 | 19.5 | 7 | 1.095695 × 10−5 | – | – |
| A-CH3OH JK = 30 − 20 | 145.103185 | 13.9 | 7 | 1.232344×10−5 | – | – |
| A-CH3OH JK = 3−2 − 2−2 | 145.124332 | 51.6 | 7 | 6.892634×10−6 | – | – |
| E-CH3OH JK = 32 − 22 | 145.126191 | 36.2 | 7 | 6.771773 × 10−6 | – | – |
| E-CH3OH JK = 3−2 − 2−2 | 145.126386 | 39.8 | 7 | 6.857968 × 10−6 | – | – |
| E-CH3OH JK = 31 − 21 | 145.131864 | 35.0 | 7 | 1.124576 × 10−5 | – | – |
| A-CH3OH JK = 32 − 22 | 145.133415 | 51.6 | 7 | 6.894658 × 10−6 | – | – |
| E-CH3OH JK = 50 − 5−1 | 157.178987 | 47.9 | 11 | 2.037818 × 10−5 | 0.65 × 0.41 | 0.19 |
| E-CH3OH JK = 40 − 4−1 | 157.246062 | 36.3 | 9 | 2.098481 × 10−5 | – | – |
| E-CH3OH JK = 10 − 1−1 | 157.270832 | 15.4 | 3 | 2.205743 × 10−5 | – | – |
| E-CH3OH JK = 30 − 3−1 | 157.272338 | 27.1 | 7 | 2.146271 × 10−5 | – | – |
| E-CH3OH JK = 20 − 2−1 | 157.276019 | 20.1 | 5 | 2.181936 × 10−5 | – | – |
| A-CH3OH JK = 1−1 − 10 | 303.366921 | 16.9 | 3 | 2.263319×10−4 | 0.46 × 0.42 | 0.07 |
| A-CH3OH JK = 2−1 − 20 | 304.208348 | 21.6 | 5 | 2.115671×10−4 | 0.46 × 0.42 | 0.07 |
| A-CH3OH JK = 3−1 − 30 | 305.473491 | 28.6 | 7 | 1.632485×10−4 | 0.48 × 0.44 | 0.06 |
| c−/o−C3H2 J = 31, 2 − 22, 1 | 145.0895946 | 16.05 | 21 | 6.764 × 10−5 | ||
| SiO J = 7 − 6 | 303.9268092 | 58.4 | 15 | 1.4648 × 10−3 | ||
| OCS J = 25 − 24 | 303.99326170 | 189.68 | 51 | 8.1948 × 10−5 | ||
| SO J = 78 − 67 | 304.0778440 | 62.1 | 17 | 3.609 × 10−4 | ||
Notes. We note that only lines covered within ±230 km s−1 with respect to the main line are listed as shown with vertical lines in Fig. 1 – these are considered to be the “contributors” of the velocity-integrated intensities measured from the moment-0 maps. Observational details and the spatial resolution of the data used in this paper are also provided. A distance of 14 Mpc is assumed. The main line refers to transitions with the lowest Eu in each frequency group – in particular for the 96 GHz, 145 GHz, and 157 GHz groups.
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