Table 3.
Transitions of HCO+ and its isotopologues used in this work.
| Species | Transition | Rest frequency | Eu | Aul | Ref. |
|---|---|---|---|---|---|
| [GHz] | [K] | [s−1] | |||
| HCO+ | 1–0 | 89.188 | 4.28 | 4.187 × 10−5 | 1, 2, 3, 4 |
| 2–1 | 178.375 | 12.84 | 4.019 × 10−4 | ||
| 3–2 | 267.558 | 25.68 | 1.453 × 10−3 | ||
| 4–3 | 356.734 | 42.80 | 3.572 × 10−3 | ||
| H13CO+ | 1–0 | 86.754 | 4.16 | 3.853 × 10−5 | 1, 2, 5 |
| 2–1 | 173.507 | 12.46 | 3.699 × 10−4 | ||
| 3–2 | 260.255 | 24.98 | 1.337 × 10−3 | ||
| 4–3 | 346.998 | 41.63 | 3.287 × 10−3 | ||
| HC18O+ | 1–0 | 85.162 | 4.09 | 3.6449 × 10−5 | 1, 2, 6 |
| 2–1 | 170.322 | 12.26 | 3.498 × 10−4 | ||
| 3–2 | 255.479 | 24.52 | 1.265 × 10−3 | ||
Notes. We use molecular data of HCO+and its isotopologues from: 1) Flower (1999), 2) Denis-Alpizar et al. (2020), 3) Lattanzi et al. (2007), 4) Tinti et al. (2007), 5) Gregersen & Evans (2001), 6) Schmid-Burgk et al. (2004). The data were sourced from the LAMDA database (Schöier et al. 2005) and the CDMS catalogue (Müller et al. 2001, 2005; Endres et al. 2016).
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