Table 5
H2O and NH4+ ice column densities calculated toward the investigated sources using laboratory IR spectra and apparent band strengths of NH4SH in H2O-rich ices.
| Source | H2O | NH4+ | |
|---|---|---|---|
| 1019 cm−2 | 1018 cm−2 | % H2O | |
| Elias 16 | 0.24 (0.03)(a) | 0.26 (0.05) | 11 (2) |
| CK2 | 0.30 (0.03)(a) | 0.57 (0.11) | 19(4) |
| B1-c | 2.5 (0.2)(b) | 2.8 (0.5) | 11 (2) |
| L1527 | 2.6 (0.6)(c) | 2.1 (0.4) | 8 (3) |
| W33A | 1.25 (0.3)(a) | 2.5 (0.5) | 20 (7) |
| S140 IRS1 | 0.20 (0.03)(a) | 0.45 (0.08) | 23 (5) |
Notes. Uncertainties are indicated in parentheses (). (a)From Boogert et al. (2013). (b)From Chen et al. (2024). (c)From the 12 µm H2O libration using a band strength of 3.2×10−17 cm molec−1 (Mastrapa et al. 2009; Bouilloud et al. 2015); see Figure E.1.
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