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Table 3

Optically thin estimates of HnO+ column densities toward the CO+ peak of the Orion Bar, in units of 1012 cm-2, as a function of assumed excitation temperature.

Tex (K) OH+ H2O+ H3O+

10 82.1  < 2.85  < 7.21
20 8.61  < 0.21  < 0.64
40 4.01  < 0.10  < 0.27
80 3.90  < 0.13  < 0.32
160 5.45  < 0.25  < 0.64

Notes. The limits for H2O+ and H3O+ are based on the 607 and 985 GHz lines; limits from the other lines are significantly higher.

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