Table 4
Summary of observed column density ratios in W49A (center, eastern tail, northern clump and southwest clump, when available) and in Galactic PDRs.
| Ratio | W49A | Orion | NGC | Mon | Horse- |
| Bar | 7023 | R2 | head | ||
|
|
|||||
| CN/HCN center | 0.55 | 3.0a | 4.5b | 2–12c | |
| CN/HCN ET | 3.8–6.9 | ||||
| CN/HCN NC | 2–4.6 | ||||
| CN/HCN SWC | 0.4–0.95 | ||||
| SiO/H13CO+ | 2.7–3.3 | 3–14d | 0.54d | 0.03–0.37e | |
| HCO/SiO | 16–23 | 2–9d | >4.6–10d | 50–720e | |
| CO+/H13CO+ | <0.56 | 0.52a,f | 0.6b,f | 0.53c | |
| CS/HCS+ | 76–108 | 11–25c | 175g | ||
| SO+/SO2 | <0.02 | 0.4–1f | >0.4f | 0.2–0.7c | |
Reference. (a) Fuente et al. (1996); (b) Fuente et al. (1993); (c) Ginard et al. (2012); (d) Schilke et al. (2001); (e) Rizzo et al. (2005); (f) Fuente et al. (2003); (g) Goicoechea et al. (2006).
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