Table 6
Abundance ratios compared with prototypical Galactic and extragalactic sources.
| Source | SiO/CS | H13CO+/CS | HN13C/CS | HNCO/CS | HN13C/H13CN | ||
|
|
|||||||
| SW CND | 0.13 | 0.04 | 0.012 | 0.10 | ... | ||
| 20 GMC | 0.24 | 0.025 | 0.13 | 1.9 | ... | ||
|
|
|||||||
| Galactic sources | |||||||
| Orion Bar | { | (20′′, −20′′) | 1.2 × 10-3 | 2.0 × 10-3 | .../6 × 10-4 | ≤ 7 × 10-4 | .../0.20 |
| (60′′, −60′′) | ... | .../0.015 | .../0.015 | ≤ 0.07 | .../1.9 | ||
| IC 443−G | 0.3 | ≤ 0.03/0.015 | .../5 × 10-3 | ... | .../0.13 | ||
| Orion KL−Plateau | 2.0 | ... | ... | 0.6 | ... | ||
| Orion KL−Hot Core | 0.05 | ... | ... | 0.3 | ... | ||
| TMC−1 | ≤ 1.5 × 10-4 | 0.04 | 0.05 | 0.4 | 1.2 | ||
|
|
|||||||
| Extragalactic sources | |||||||
| NGC 253 | 0.020 | 6 × 10-3 | 4 × 10-3 | 0.25 | 0.20 | ||
| NGC 4945 | ≤ 0.03 | 0.025 | 0.08 | 1.0 | 1.6 | ||
| M 82 | { | Southwest | ≤ 0.05 | 0.05 | ... | ≤ 4 | ... |
| Center | ... | .../9 × 10-3 | ≤ 0.04/6 × 10-3 | ≤ 1.2 | .../0.4 | ||
| Northeast | ... | ... | ... | ≤ 0.03 | ... | ||
| IC 342 | { | Center | ... | .../0.010 | .../0.014 | 0.8 | .../0.4 |
| North | ≤ 0.16 | 0.07 | ... | 1.0 | ... | ||
| IC 342 | { | A | (2.3–7) × 10-3 | (1.7–5) × 10-3 | .../(1.1–3) × 10-3 | ≤ 0.14 | .../0.23 |
| D | ≥ 0.018 | ≥ 3 × 10-3 | .../ ≥ 1.9 × 10-3 | ≥ 0.25 | .../0.18 | ||
| (interf.) | D′ | ... | ... | .../ ≥ 1.8 × 10-3 | ≥ 0.5 | ... | |
Notes. When two values for the abundance ratio are presented, the first one has been derived from the 13C isotopic species and the second one from the main isotope assuming 12C/13C ≈ 65 for IC 443−G and the Orion Bar (van Dishoeck et al. 1993; Jansen et al. 1995), and 12C/13C ≃ 40 (Henkel et al. 1998) for the extragalactic sources. Interferometric column density ratios of IC 342 have been derived from C34S assuming a range of 32S/34S isotopic ratios of 8−23 (see Meier & Turner 2005).
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