Observations of Anomalous Microwave Emission from HII Regions

Figure 2

Colour-Colour plots of IRAS sources in the vicinity of Perseus (a), G107.2+5.2 (b), and G173.6+2.79 (c) AME regions. The colours are calculated for sources within 1^∘ of the central source positions using the IRAS PSC. UCHII region candidates, shown as solid-filled circles, have ratios log₁₀(𝑆₆₀/𝑆₁₂)≥1.30 and log₁₀(𝑆₂₅/𝑆₁₂)≥0.57, corresponding to the top-right hand corner of this plot (marked with a dashed line).

(a)

(b)

(c)