Table 2
Molecular transitions selected for analysis.
| Molecule | Transition | vul(a) (GHz) | Eu/k(b) (K) | Aul(c) (s−1) | Cul(d) (10−11 cm−3 s−1) | ncrit(e) (cm−3) |
|---|---|---|---|---|---|---|
| CO | 1–0 | 115.271 | 5.5 | 7 × 10−8 | 3.5 | 2 × 103 |
| 2–1 | 230.538 | 16.6 | 7 × 10−7 | 6.3 | 1 × 104 | |
| 3–2 | 345.796 | 33.2 | 2 × 10−6 | 6.9 | 3 × 104 | |
| 4–3 | 461.041 | 55.3 | 6 × 10−6 | 7.0 | 9 × 104 | |
| 13CO(*) | 1–0 | 110.201 | 5.3 | 6 × 10−8 | 3.5 | 2 × 103 |
| 2–1 | 220.299 | 15.9 | 6 × 10−7 | 6.3 | 1 × 104 | |
| 3–2 | 330.588 | 31.7 | 2 × 10−6 | 6.9 | 3 × 104 | |
| HC3N(*) | 10–9 | 90.979 | 24.0 | 6 × 10−5 | 5.1 | 1 × 106 |
| 11–10 | 100.076 | 28.8 | 8 × 10−5 | 5.1 | 2 × 106 | |
| 12–11 | 109.174 | 34.1 | 1 × 10−4 | 5.1 | 2 × 106 | |
| 24–23 | 218.325 | 131.0 | 8 × 10−4 | 5.2 | 2 × 107 | |
| p-H2CO(*) | 30,3–20,2 | 218.222 | 21.0 | 3 × 10−4 | 8.4 | 3 × 106 |
| 32,1–22,0 | 218.760 | 68.1 | 2 × 10−4 | 4.9 | 4 × 106 | |
| 40,4–30,3 | 290.623 | 34.9 | 7 × 10−4 | 8.9 | 8 × 106 | |
| 42,2–32,1 | 291.948 | 82.1 | 5 × 10−4 | 6.2 | 8 × 106 | |
| CS(*) | 2–1 | 97.981 | 7.1 | 2 × 10−5 | 4.4 | 5 × 105 |
| 7–6 | 342.882 | 65.8 | 8 × 10−4 | 5.7 | 1 × 107 | |
| 13CS | 2–1 | 92.494 | 6.7 | 1 × 10−5 | 4.4 | 2 × 105 |
| N2H+ * | 1–0 | 93.173 | 4.5 | 4 × 10−5 | 20.0 | 2 × 105 |
| HCO+ * | 1–0 | 89.189 | 4.3 | 4 × 10−5 | 18.0 | 2 × 105 |
| 3–2 | 267.558 | 25.7 | 1 × 10−3 | 39.0 | 3 × 106 | |
| 4–3 | 356.734 | 42.8 | 4 × 10−3 | 40.0 | 1 × 107 | |
| H13CO+ | 1–0 | 86.754 | 4.2 | 4 × 10−5 | 18.0 | 2 × 105 |
| HCN(*) | 1–0 | 88.632 | 4.3 | 2 × 10−5 | 0.9 | 2 × 106 |
| 3–2 | 265.886 | 25.5 | 8 × 10−4 | 1.2 | 7 × 107 | |
| 4–3 | 354.505 | 42.5 | 2 × 10−3 | 1.2 | 2 × 108 | |
| H13CN | 1–0 | 86.340 | 4.1 | 2 × 10−5 | 0.7 | 3 × 106 |
| HNC(*) | 1–0 | 90.664 | 4.4 | 3 × 10−5 | 6.5 | 5 × 105 |
| SiO(*)) | 2–1 | 86.847 | 6.3 | 3 × 10−5 | 9.6 | 3 × 105 |
| 5–4 | 217.105 | 31.3 | 5 × 10−4 | 11.0 | 5 × 106 | |
| 7–6 | 303.927 | 58.3 | 1 × 10−3 | 11.0 | 9 × 106 | |
| 8–7 | 347.331 | 75.0 | 2 × 10−3 | 11.0 | 2 × 107 | |
| 10–9 | 434.120 | 114.6 | 4 × 10−3 | 11.0 | 4 × 107 | |
| SO (*) | 23–12 | 99.300 | 9.2 | 1 × 10−5 | 3.8 | 3 × 105 |
| 32–21 | 109.252 | 21.1 | 1 × 10−5 | 5.2 | 2 × 105 | |
| 56–45 | 219.949 | 35.0 | 1 × 10−4 | 5.8 | 2 × 106 | |
| 43–34 | 267.198 | 28.7 | 7 × 10−7 | 0.8 | 9 × 104 | |
| HNCO (*) | 40,4–30,3 | 87.925 | 10.5 | 7 × 10−6 | 6.3 | 1 × 105 |
| 50,5–40,4 | 109.906 | 15.8 | 2 × 10−5 | 6.7 | 3 × 105 | |
| 100,10–90,9 | 219.798 | 58.0 | 2 × 10−4 | 7.6 | 3 × 106 | |
| OCS(*) | 8–7 | 97.301 | 21.0 | 3 × 10−6 | 8.0 | 4 × 104 |
| 9–8 | 109.463 | 26.3 | 4 × 10−6 | 8.1 | 5 × 104 | |
| 18–17 | 218.903 | 100.0 | 3 × 10−5 | 7.5 | 4 × 105 | |
| A-CH3OH(*) | 21,2–11 | 95.914 | 21.4 | 2 × 10−6 | 6.3 | 3 × 104 |
| 21,1–11,0 | 97.583 | 21.6 | 3 × 10−6 | 5.5 | 5 × 104 | |
| 61,5–51,4 | 292.673 | 63.7 | 1 × 10−4 | 9.5 | 1 × 106 | |
| CH3CN | 54–44 | 91.959 | 85.6 | 1 × 10−5 | 18.0 | 6 × 104 |
| 53–43 | 91.971 | 50.8 | 4 × 10−5 | 18.0 | 2 × 105 | |
| 52–42 | 91.980 | 26.0 | 5 × 10−5 | 19.0 | 3 × 105 | |
| 51-41 | 91.985 | 11.1 | 5 × 10−5 | 19.0 | 3 × 105 | |
| 50–40 | 91.987 | 6.1 | 6 × 10−5 | 20.0 | 3 × 105 | |
| 65–55 | 110.330 | 133.3 | 2 × 10−5 | 18.0 | 1 × 105 | |
| 64–54 | 110.349 | 88.6 | 6 × 10−5 | 18.0 | 3 × 105 | |
| 63–53 | 110.364 | 53.9 | 7 × 10−5 | 18.0 | 4 × 105 | |
| 62–52 | 110.375 | 29.1 | 9 × 10−5 | 19.0 | 5 × 105 | |
| 61–51 | 110.381 | 14.2 | 9 × 10−5 | 20.0 | 5 × 105 | |
| 60–50 | 110.384 | 9.2 | 1 × 10−4 | 20.0 | 5 × 105 |
Notes. (a)Rest frequency from CDMS. (b)Upper level energy from CDMS. (c)Einstein A coefficient from CDMS. (d)Collisional rate coefficient at 100 K from LAMDA database (Schöier et al. 2005). (e)Critical density ncrit = Aul/Cul at 100 K.(*) Molecules for which LVG modelling was performed (see Sect. 3.3).
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