Table 6
Estimated abundances and upper limits of four other counterion candidates, reported in percentages (%) with respect to NH4+ column densities.
| Source | OCN−(a) | CN−(b) | HCOO−(c) | Cl−(d) | Total anion budget | |
|---|---|---|---|---|---|---|
| w/o Cl− | incl. Cl− | |||||
| B1-c | 6.7 (1.3) | ≤0.9 | ≤6.4 | ≤8.5 | ≤14 | ≤22 |
| L1527 | 4.5 (0.9) | ≤0.1 | ≤2.9 | ≤8.2 | ≤7.5 | ≤16 |
| W33A | 10.8 (2.2) | n.d. | ≤2.4 | ≤8.1 | ≤13 | ≤21 |
Notes. Uncertainties are indicated in parentheses (). (a) Calculated using a band strength of 1.3×10−16 cm molec−1 (van Broekhuizen et al. 2004). (b)Calculated using a band strength of 5.74×10−18 cm molec−1 (Gerakines et al. 2024).(c)Calculated using a band strength of 2.1×10−17 cm molec−1 (Bergner et al. 2016).(d)Calculated using the diffuse ISM Cl/H of 2.88×10−7 (Esteban et al. 2004).
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