Review Article
Anomalous Microwave Emission from Star Forming Regions
Table 1
Physical parameters for different types of HII regions.
| Class | Size | Density | EM | (pc) | (cm−3) | (cm−6 pc) |
| Hypercompact | ≤0.03 | ≥106 | ≥1010 | Ultracompact | ≤0.1 | ≥104 | ≥107 | Compact | ≤0.5 | ≥5 × 103 | ≥107 | Classical | ~10 | ~100 | ~102 |
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