Table 1.
HNCO and SiO transitions used in this work.
| Species | Transition (a) | Rest frequency | Eu | Aul | gu | mJy beam−1 to K (b) |
|---|---|---|---|---|---|---|
| [GHz] | [K] | [s−1] | ||||
| HNCO | 40,4–30,3 | 87.9252 | 10.55 | 9.024e−06 | 9 | 0.062 |
| 50,5–40,4 | 109.9057 | 15.82 | 1.803e−05 | 11 | 0.040 | |
| 60,6–50,5 | 131.8857 | 22.15 | 3.163e−05 | 13 | 0.027 | |
| 70,7–60,6 | 153.8651 | 29.54 | 5.078e−05 | 15 | 0.020 | |
| 80,8–70,7 | 175.8437 | 37.98 | 7.643e−05 | 17 | 0.015 | |
| 90,9–80,8 | 197.8215 | 47.47 | 1.095e−04 | 19 | 0.012 | |
| 100,10–90,9 | 219.7983 | 58.02 | 1.51e−04 | 21 | 0.010 | |
| 120,12–110,11 | 263.7486 | 82.28 | 2.631e−04 | 25 | 0.007 | |
| 130,13–120,12 | 285.7220 | 95.99 | 3.355e−04 | 27 | 0.006 | |
| 140,14–130,13 | 307.6939 | 110.76 | 4.201e−04 | 29 | 0.005 | |
| 150,15–140,14 | 329.6644 | 126.58 | 5.178e−04 | 31 | 0.004 | |
| SiO | 2–1 | 86.847 | 6.25 | 2.927e−05 | 5 | 0.063 |
| 3–2 | 130.269 | 12.50 | 1.058e−04 | 7 | 0.028 | |
| 4–3 | 173.688 | 20.84 | 2.602e−04 | 9 | 0.015 | |
| 5–4 | 217.105 | 31.26 | 5.197e−04 | 11 | 0.010 | |
| 6–5 | 260.518 | 43.76 | 9.118e−04 | 13 | 0.007 | |
| 7–6 | 303.927 | 58.35 | 1.464e−03 | 15 | 0.005 | |
Notes. We use HNCO and SiO molecular data from Niedenhoff et al. (1995), Sahnoun et al. (2018), Balança et al. (2018) via the LAMDA database (Schöier et al. 2005).
The transition quantum number labeling and the rest frequency data are from the Cologne Database for Molecular Spectroscopy (CDMS) catalog https://cdms.astro.uni-koeln.de/ (Müller et al. 2001, 2005; Endres et al. 2016).
The conversion factor from [mJy beam−1] to [K] described in Sect. 3 in each transition is provided.
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