Table A.1
Spectroscopic values for the transitions used in the analysis to derive the molecular column densities.
| Rot. transition | Hyperfine comp.(a) | ν (GHz) | gu | Eu∕kB (K) | Aul∕10−5 (s−1) | Reference | |||
|---|---|---|---|---|---|---|---|---|---|
| N2H+ | |||||||||
| J = 1–0 | J, F1, F = 1, 0, 1 ← 0, 1, *(b) | 93.1762604 | 3 | 4.472 | 3.628 | 1 | |||
| J = 3–2 | J, F1, F = 3, 4, 5 ← 2, 3, 4 | 279.5118572 | 11 | 13.41 | 1.259 102 | 1 | |||
| N2D+ | |||||||||
| J = 1–0 | J, F1, F = 1, 0, 1 ← 0, 1, * | 77.1121207 | 3 | 3.701 | 2.057 | 2 | |||
| J = 2–1 | J, F1, F = 2, 3, 3 ← 1, 2, 2 | 154.2170958 | 7 | 11.10 | 18.08 | 2 | |||
| J = 2–1 | J, F1, F = 2, 3, 2 ← 1, 2, 1 | 154.2171220 | 5 | 11.10 | 15.63 | 2 | |||
| J = 2–1 | J, F1, F = 2, 2, 3 ← 1, 1, 2 | 154.2171273 | 7 | 11.10 | 14.17 | 2 | |||
| J = 2–1 | J, F1, F = 2, 3, 4 ← 1, 2, 3 | 154.2171888 | 9 | 11.10 | 19.74 | 2 | |||
| J = 3–2 | – | 231.3218611 | 7 | 22.20 | 71.38 | 2 | |||
| DCO+ | |||||||||
| J = 1–0 | – | 72.0393123 | 3 | 3.457 | 2.206 | 3 | |||
| J = 2– 1 | – | 144.0772854 | 5 | 10.37 | 21.18 | 3 | |||
| J = 3–2 | – | 216.1125804 | 7 | 20.74 | 76.58 | 3 | |||
| HC18O+ | |||||||||
| J = 1–0 | – | 85.1622231 | 3 | 4.087 | 3.645 | 4 | |||
Notes. (a) When no hyperfine component is indicated, the transition is intended as a single transition. (b) The notation 
indicates that there are multiple but degenerate lower states, which have the same energy but different F quantum number.
References.The spectroscopic data are taken from: (1) our calculation based on data from Cazzoli et al. (2012), (2) our calculation based on data from Dore et al. (2004), Amano et al. (2005), and Yu et al. (2015), (3) our calculation based on data from Caselli & Dore (2005) and Lattanzi et al. (2007), and (4) from Bizzocchi et al. (in prep.).
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