Table 3.
Optical depths and column densities for the molecular absorption lines.
| Line | τ(ν0) | ΔV | ∫τνdV | Nl |
|---|---|---|---|---|
| [km s−1] | [km s−1] | [1014 cm−2] | ||
| OH+(11 − 01) | 0.62 ± 0.14 | −280 to +530 | 191.4 ± 17.2 | 11.2 ± 1.0 |
| OH+(12 − 01) | 0.61 ± 0.16 | −400 to +600 | 306.0 ± 23.9 | 9.6 ± 0.8 |
| OH+(10 − 01) | 0.24 ± 0.09 | −33 to +560 | 53.8 ± 15.1 | 7.2 ± 2.0 |
| CH+(1 − 0) | 0.36 ± 0.13 | −145 to +500 | 91.4 ± 22.8 | 2.6 ± 0.7 |
| HCN(11 − 10) | 0.24 ± 0.12 | −570 to +430 | 66.1 ± 18.3 | 0.38 ± 0.1 |
| NH(12 − 01) | 0.24 ± 0.12 | −570 to +430 | 66.1 ± 18.3 | 6.7 ± 1.9 |
Notes. The frequency ν0 corresponds to the deepest dip of each lines. In the case of the absorption line observed at 246.72 GHz, we provide two possible column densities obtained assuming that the line is a transition of either HCN or NH separately, although we note that both lines likely contribute at the same time (see Sect. 8.1).
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