Table 1
Observed lines.
| Molecule | Transitions | Frequency (GHz) | Eup (K) | Critical density(a) (×104 cm−3) | 30 m Beam (HPFW in ”) |
|---|---|---|---|---|---|
| CH3OH-E | 2−1,2−1−1,1 | 96.7394 | 12.5 | 1.3 | 26.0 |
| 20,2−10,1 | 96.7445 | 20.1 | 15.4 | 26.0 | |
| 21,2−11,1 | 96.7555 | 28.0 | 31.5 | 26.0 | |
| 30,3−20,2 | 145.0938 | 27.1 | 26.2 | 17.3 | |
| 3−1,3−2−1,2 | 145.0974 | 19.5 | 4.4 | 17.3 | |
| 31,3−21,2 | 145.1319 | 35.0 | 46.1 | 17.3 | |
| 40,4-4−1,4 | 157.2461 | 36.3 | 44.2 | 16.0 | |
| 10,1−1−1,1 | 157.2708 | 15.4 | 9.3 | 16.0 | |
| 20,2−2−1,2 | 157.2760 | 20.1 | 15.3 | 16.0 | |
| 30,3-3−1,3 | 157.2723 | 27.1 | 26.2 | 16.0 | |
| c-C3Η2 | 31,2−22,1 | 145.0896 | 16.1 | 10.4 | 17.3 |
| 33,0−22,1 | 216.2788 | 19.5 | 33.7 | 11.6 | |
| 61,6-50,5 | 217.8221 | 38.6 | 70.8 | 11.5 | |
| 43,2-32,1 | 227.1691 | 29.1 | 52.0 | 11.1 | |
| HNCO(b) | 50,5-40,4 | 109.9058 | 15.8 | 5.1 | 22.9 |
| 60,6-50,5 | 131.8857 | 22.1 | 8.8 | 19.1 | |
| 70,7-60,6 | 153.8651 | 29.5 | 13.9 | 16.3 | |
| 80,8-70,7 | 175.8437 | 38.0 | 21.5 | 14.3 |
Notes. The laboratory spectroscopy references are Xu et al. (2008) for CH3OH, Vrtilek et al. (1987) for c-C3H2, and Hocking et al. (1975) for HNCO. (a) Calculated following definition in Shirley (2015) in the optically thin limit at 10 K, considering a multilevel energy system whenever necessary. (b)Para-H2 is assumed to be the collision partner.
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