Table 1.
Transitions of CO and its isotopologues used in this work.
| Species | Transition | Rest frequency | Eu | Aul | Ref. |
|---|---|---|---|---|---|
| [GHz] | [K] | [s−1] | |||
| CO | 1–0 | 115.271 | 5.53 | 7.203 × 10−8 | |
| 2–1 | 230.538 | 16.60 | 6.910 × 10−7 | 1, 2, 3 | |
| 3–2 | 345.796 | 33.19 | 2.497 × 10−6 | ||
| 13CO | 1–0 | 110.201 | 6.25 | 6.333 × 10−8 | |
| 2–1 | 220.399 | 15.87 | 6.075 × 10−7 | 3, 4, 5 | |
| 3–2 | 330.588 | 31.73 | 2.194 × 10−6 | ||
| C17O | 1–0 | 112.359 | 5.39 | 6.697 × 10−8 | |
| 2–1 | 224.715 | 16.18 | 6.425 × 10−7 | 3, 6 | |
| 3–2 | 337.061 | 32.35 | 1.805 × 10−6 | ||
| C18O | 1–0 | 109.782 | 5.27 | 6.266 × 10−8 | |
| 2–1 | 219.560 | 15.81 | 6.012 × 10−7 | 3, 7 | |
| 3–2 | 329.331 | 31.61 | 2.171 × 10−6 | ||
Notes. We use molecular data of CO and its isotopologues from: 1) Goorvitch (1994), 2) Winnewisser et al. (1997), 3) Yang et al. (2010), 4) Klapper et al. (2000), 5) Cazzoli et al. (2004), 6) Klapper et al. (2003), and 7) Klapper et al. (2001). The data were sourced from the LAMDA database (Schöier et al. 2005) and the Cologne Database for Molecular Spectroscopy (CDMS) catalogue (https://cdms.astro.uni-koeln.de/) (Müller et al. 2001, 2005; Endres et al. 2016).
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