Table 2
Column densities and abundances relative to CH3OH of O2, HO2, and H2 O2.
| Molecule | N | N/N(CH3OH) (%) | |
|---|---|---|---|
| (cm−2) | IRAS 16293 | Comet 67Pc | |
| O2 | ≤ (4.2− 9.0) × 1019 | ≤2.1−4.5a | 5−15 |
| (9.9− 21) × 1019 | 5.0−10.5b | 5−15 | |
| H2 O2 | − | − | 0.27−1.0 |
| HO2 | ≤ (1.1− 2.8) × 1014 | ≤(5.5−14) × 10−4 | 0.85−3.2 |
Notes. Column densities have been derived assuming excitation temperatures between 125 and 300 K (see text for more details). (a) Abundance assuming that the 16O18O transition is not detected. (b)Abundance assuming that the 16O18O transition is detected. (c)Abundances derived following the abundances measured by Le Roy et al. (2015) and Bieler et al. (2015).
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