Table 2
Rotational transitions considered for the line radiative transfer.
| Molecule | Transition | Freq. | Beam size(a) | Ref. collision coefs.(b) |
|---|---|---|---|---|
| (GHz) | (arcsec) | |||
| 13CO | 1 → 0 | 110.201 | 22.32 | Yang et al. (2010) |
| H13CO+ | 1 → 0 | 86.754 | 28.36 | Yazidi et al. (2014) |
| H13CN | 1 → 0 | 86.340 | 28.49 | Navarro-Almaida et al. (2023) |
| HNC | 1 → 0 | 90.664 | 27.13 | Dumouchel et al. (2011) |
| CS | 2→ 1 | 97.981 | 25.11 | Lique et al. (2006) |
| OCS | 7 → 6 | 85.139 | 28.89 | Green & Chapman (1978) |
| SO | (2, 3) → (1, 2) | 99.300 | 24.77 | Lique et al. (2007) |
| HCS+ | 2→ 1 | 85.348 | 28.82 | Flower (1999) |
| H2S | (110 → 101) | 168.763 | 14.58 | Dagdigian (2020) |
Notes. (a) Beam sizes are Half Power Beam Width (HPBW) computed from the IRAM 30 m efficiencies as HPBW = 2460/Freq. (GHz).(b) Collision files have been retrieved from the CASSIS Collision Database (https://cassis.irap.omp.eu/), with the exception of the file for H13CN. Rest frequencies in the table are taken from the collision files. Only collisions with H2 are relevant in a dark molecular cloud.
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