Table 1
Spectral lines detected in the slim filaments.
| Molecule | Transition | Rest frequency | Eu / k | N(a)crit |
|---|---|---|---|---|
| (MHz) | (K) | (cm−3) | ||
| SiO | 5–4 | 217104.98 | 31.3 | 2.6×106 |
| c-C3H2 | 61,6–50,5 | 217822.15 | 38.6 | 4.5×107 |
| H2CO | 30,3 −20,2 | 218222.19 | 21.0 | 3.4×106 |
| HC3N | 24−23 | 218324.72 | 131.0 | 1.7×107 |
| CH3OH | 42,2−31,2 | 218440.06 | 45.5 | 7.8×107 |
| HNCO | 100,10−90,9 | 219798.27 | 58.0 | 7.6×106 |
| H213 CO | 31,2−21,1 | 219908.53 | 32.9 | 4.8×106 |
| SO | 65−54 | 219949.44 | 35.0 | 2.3×106 |
| CH3CN | 121−111 | 220743.01 | 76.0 | 4.5×106 |
| 120−110 | 220747.26 | 68.9 | 4.1 ×106 |
Notes. (a)The critical density is calculated based on Einstein coefficients Aul and collisional rate coefficients Cul from the Leiden Atomic and Molecular Database (LAMDA, Schöier et al. 2005): via the approximation ncrit = Aul/Cul (Shirley 2015) at a temperature of ~100 K. For the case of H213CO, we give the critical density for the 31,2−21,1 transition of the main isotope.
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