Table 2
Properties of targeted lines.
| Transition | va | θMBa | ηMBa | ∆Vch | Aulb | ɡub | Eub |
|---|---|---|---|---|---|---|---|
| MHz | ″ | km s−1 | ×10−5 s−1 | K | |||
| HC18O+ (2−1) | 170322.626 | 35.4 | 0.86 | 0.11 | 34.99 | 5 | 12.26 |
| H13CO+ (2−1) | 173506.700 | 34.7 | 0.86 | 0.11 | 36.99 | 5 | 12.49 |
| DCO+ (3−2) | 216112.582 | 27.9 | 0.82 | 0.08 | 76.58 | 7 | 12.49 |
| C18O (2−1) | 219560.350 | 27.5 | 0.82 | 0.08 | 0.0601 | 5 | 15.80 |
| H13CO+ (3−2) | 260255.339 | 23.2 | 0.78 | 0.07 | 133.75 | 7 | 24.98 |
| HCO+ (3−2) | 267557.626 | 22.5 | 0.78 | 0.07 | 145.30 | 7 | 25.68 |
| DCO+ (4−3) | 288143.858 | 20.9 | 0.76 | 0.06 | 188.23 | 9 | 34.57 |
| oH2D+(11,0 − 11,1) | 372421.356 | 16.2 | 0.69 | 0.05c | 10.96 | 9 | 17.90 |
Notes. (a)In order, we list the frequency (v), angular resolution θMB, main-beam efficiency ηMB, and velocity resolution. (b)Spectroscopic constants used in the column-density computation (see Sect. 4.2). They are taken from the CDMS catalogue (Müller et al. 2005). (c)The velocity resolution of the archival APEX data for oH2D+(11,0 − 11,1) in cores Oph 1–6 is 0.2 km s−1 (Bovino et al. 2021).
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