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Table 2
Results from the rotational diagram analysis (Sect. 4.1) and molecular fractional abundances, X, i.e., relative to H2, derived (Sect. 4.2).
| Species | θa × θb | N tot | T ex | X |
| (′′) × (′′) | (cm-2) | (K) | ||
|
|
||||
| 13CO | 4 × 12 | 3.0 × 1017 | 20 | 5.0 × 10-5 |
| H12CO+ | 4 × 12 | 8.0 × 1013 | 14 | 1.3 × 10-8 |
| H13CO+ | 4 × 12 | 1.2 × 1013 | 10 | 2.0 × 10-9 |
| SO+ | 4 × 12 | 2.2 × 1013 | 20 | 3.7 × 10-9 |
| N2H+ | 4 × 12 | 1.3 × 1013 | 8 | 2.2 × 10-9 |
| H3O+ | 4 × 12 | ~4 × 1013 | ≈100 | ~7 × 10-9 |
| 4 × 4 | ~5 × 1013 | ~55 | ||
Notes. We have adopted X(13CO) = 5 × 10-5 (Morris et al. 1987).
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