Table 6
Comparison of the column density ratios measured toward the center of W49A to values measured toward regions with shock chemistry.
| Ratio | W49A | Orion KL | L1157 | W3 IRS5 | NGC 1333 |
| center | Plateau | IRAS 4A | |||
|
|
|||||
| OCS/CS | 0.9–1.3 | 5 | 0.2 | 0.4 | |
| CS/HCS+ | 76–108 | 50 | 63 | 321 | |
| CS/HCO+ | 0.5–1.0 | 5.6 | 3.7 | 1.1 | 19.5 |
| CS/H2CO | 1.6–2.3 | 0.1 | 0.3–0.9 | 2.4 | 0.6 |
| HCO+/HCS+ | 90–165 | 9 | 17 | 304 | |
| H2CO/H2CS | 5.0–5.1 | 18 | 2–5.3 | 6.2 | |
| SiO/H2CO | 0.1 | 0.8 | 0.1–0.3 | 0.06 | 0.04 |
| SO2/H2CO | 35.4–36.7 | 140 | 0.4–1 | 64.5 | <0.55 |
Reference. Orion KL plateau SiO/H2CO and SO2/H2CO (Persson et al. 2007), Orion KL plateau other column density ratios (Tercero et al. 2010); L1157 position B1 (Bachiller & Pérez Gutiérrez 1997); W3 IRS5 (Helmich & van Dishoeck 1997); NGC 1333 IRAS 4A outflow (Blake et al. 1995).
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