Online Material
Appendix A:
The rotational diagram in Fig. A.1
is complemented with ground-based data for the frequency range
300-400 GHz observed at the CSO with comparable beam size by
Phillips et al. (1992). The non-detection at 307 MHz is surprising, but possibly an effect of optical depth. The data in Fig. A.1,
except 307 GHz, are well fitted by a single rotational temperature
of 239 K, suggesting that the observed levels are populated
according to an exponential distribution. The derived temperature and
column density infer an optical depth of
for all lines except at 307 GHz. The fitted line (dashed) corresponds to a column density of
cm-2, consistent with the value derived by Phillips et al. (1992). This leads to a beam averaged H3O+ abundance of
relative to H, to be compared with the theoretical value of
reported by Bruderer et al. (2010a).
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Figure A.1: Rotational diagram of H3O+. Numbers indicate the frequencies in GHz of the observed lines. |
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