Table 1
Properties for typing SNRs and W49B’s results.
| Properties | W49B | Bipolar CC | Normal CC | Type-Ia |
|---|---|---|---|---|
| PWN | No | + | ± | + |
| NS | Unclear | ± | ± | ± |
| Ejecta | Iron-group rich | − | − | + |
| Asymmetry | Yes | + | + | ± |
| Wind bubble | ≲6 pc | − | + | ± |
Notes. The − and + symbols under each explosion mechanism indicate negative and positive evidence, respectively, given the properties of W49B listed in the second column. The ± symbols indicate that some known SNRs (not for all) with similar properties match the scenario, or that the explosion mechanism cannot be constrained due to some unclear property.
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