Table 4.
Summary of the estimated XD/XH ratios toward the v = −4 km s−1 component, and their associated uncertainties.
| Ratio A/B | Observed ratio | Pivot species | OPR | Time variations (†) | Final ratio A/B |
|---|---|---|---|---|---|
| ND/NH | ND/p-NH2 | NH/NH2 = 1–5 (°) | OPR(NH2) = 3 | ×2 | (0.7–7) × 10−3 |
| NH2D/NH3 | o-NH2D/p-NH2 | NH2/NH3 = 1–20 (°) | OPR(NH2) = 3 | – | (1.4–27) × 10−4 |
| HDO/H2O | HDO/ |
16O/18O = 69 ± 11 (⋄) | OPR(H2O) = 3 | ×2 | ∼1 × 10−3 |
| ND/NH2D | ND/o-NH2D | – | OPR(NH2D) = 3 | ×2 | 1–3 |
| o-NH2D/p-NH2 | – | – | OPR(NH2D) = 3 | – | 2.7 × 10−3 |
| OPR(NH2) = 3 | |||||
Notes. (†)time variations of the v = −4 km s−1 component between 2019 April 11 and 2019 July 11, inferred from observations of the same transition of CH3OH, see spectra in Fig. 4; (°)see Persson et al. (2010, 2012), Le Gal et al. (2014); (⋄)see Muller et al. (2006, 2011).
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