Table 3
Ortho/para ratios for different molecules and velocity ranges.
| Molecule | −92 to −69 | −47 to −13 | −9 to 8 | 12 to 22 | 47 to 89 | Core | Total | High temperature |
|---|---|---|---|---|---|---|---|---|
| ortho/para | (km s−1) | (km s−1) | (km s−1) | (km s−1) | (km s−1) | limit | ||
| (GC) | (Norma arm) | (GC) | (Scutum arm) | (Env. Sgr B2) | ||||
| H2CO | – | – | – | – | – | 2.2 | 2.2 | 3(a) |
| H2Cl+ | – | – | 3.0 | 4.6 | – | – | 2.2 | 3(b) |
| H2O+ | – | 1.2 | 4.6 | – | 2.4 | 1.1 | 2.6 | 3(c) |
| *H2S | – | – | – | – | 0.4 | 31.2 | 10.4 | 3(d) |
| *H3O+ | – | – | – | – | 4.2 | – | 4.2 | 1(e) |
| NH2 | – | 5.4 | 3.4 | – | 1.7 | 10.3 | 2.4 | 3(f) |
| *NH3 | – | 3.3 | 0.1 | – | <0.1 | – | <0.1 | 1(g) |
Notes. Results derived for molecules marked with “*” might be affected by the underlying LTE assumption.
References. (a) Dickens & Irvine (1999), (b)Gerin et al. (2013), (c)Schilke et al. (2010), (d)Crockett et al. (2014), (e)Faure et al. (2019), (f)Le Gal et al. (2016), (g)Faure et al. (2013).
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