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Table 5
Comparison of the column density ratios measured toward the center of W49A to PDR models with pressures of 107 cm-3 K and 108 cm-3 K illuminated by a radiation field of χ = 3.5 × 105χ0.
| Models | |||
| Ratio | W49A center | P = 107 cm-3 K | P = 108 cm-3 K |
|
|
|||
| CN/HCN | 0.55 | 42.4 | 7.1 |
| HCO/H13CO+ | 43.2–75.9 | 31.5 | 5.0 |
| CO+/H13CO+ | <0.56 | 0.81 | 0.86 |
| CS/HCS+ | 76–108 | 7151 | 5696 |
| SO+/SO2 | <0.02 | 6564 | 4892 |
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