Table 1
Properties of the observed molecular lines used in this work.
| Molecule | vrest[GHz] | ncrit[cm−3] | θnative [′ ′] | vint[km/s] |
| C2H(1−0)(h) | 87.328 | 1.0 · 105 | 28 | [−40,−20] ∪[0,20] |
| HCN(1−0) (h) | 88.631 | 2.7 · 105 | 28 | [−10, 20] |
| HCO+(1−0) | 89.188 | 4.5 · 104 | 28 | [0, 20] |
| HNC(1−0) | 90.663 | 7.0 · 104 | 28 | [0, 20] |
| N2H+(1−0)(h) | 93.173 | 4.1 · 104 | 28 | [−5, 25] |
| C18O(1−0) | 109.782 | 4.8 · 102 | 23 | [0, 20] |
| 13CO(1−0) | 110.201 | 4.8 · 102 | 23 | [0, 20] |
| 12CN(1−0) (h) | 113.490 | 2.4 · 105 | 23 | [−43,−30] ∪[−20,−7] ∪[0,30] |
Notes. The molecular lines used in this work are sorted by increasing rest frequency. We report the rest frequency, the critical density for collisions with H2 at a kinetic temperature of 20 K (Shirley 2015; Santa-Maria et al. 2023; Zakardjian et al. 2025), native resolution, and the velocity range over which we integrate the main beam temperature to compute the integrated intensity. The letter h in brackets indicates that the corresponding molecular line has a hyperfine structure.
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