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Table 1
Properties of the molecular transitions that we investigate in this work.
| Molecule | Transition | ν0 (GHz) | xmol | ncrit (cm−3) |
|---|---|---|---|---|
| CO | J = 3 → 2 | 345.796 | 10−4 | 1.75 × 104 |
| CS | J = 8 → 7 | 342.883 | 10−9 | 7.75 × 106 |
| HCN | J = 4 → 3 | 354.505 | 10−8 | 1.88 × 107 |
| HCO+ | J = 4 → 3 | 356.734 | 10−9 | 4.36 × 106 |
| N2H+ | J = 4 → 3 | 372.673 | 10−10 | 3.71 × 106 |
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