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	≥10^6	≥10^10
Ultracompact	≤0.1	≥10^4	≥10^7
Compact	≤0.5	≥5 × 10^3	≥10^7
Classical	~10	~100	~10^2