Anomalous Microwave Emission from Star Forming Regions
Figure 1
(a) Spectra of different types of HII region from Table 1. Red dashed lines indicate turnover frequencies at 1.76 and 47.2 GHz for emission measures of and cm−6 pc, respectively. (b) Turnover frequency from optically thick to optically thin for free-free emission as a function of emission measure for a range of temperatures.