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We present evidence for anomalous microwave emission in the RCW175 \hiiregion. Motivated by 33 GHz $13\arcmin$ resolution data from the Very SmallArray (VSA), we observed RCW175 at 31 GHz with the Cosmic Background Imager(CBI) at a resolution of $4\arcmin$. The region consists of two distinctcomponents, G29.0-0.6 and G29.1-0.7, which are detected at high signal-to-noiseratio. The integrated flux density is $5.97\pm0.30$ Jy at 31 GHz, in goodagreement with the VSA. The 31 GHz flux density is $3.28\pm0.38$ Jy($8.6\sigma$) above the expected value from optically thin free-free emissionbased on lower frequency radio data and thermal dust constrained by IRAS andWMAP data. Conventional emission mechanisms such as optically thick emissionfrom ultracompact \hii regions cannot easily account for this excess. Weinterpret the excess as evidence for electric dipole emission from smallspinning dust grains, which does provide an adequate fit to the data.

Anomalous Microwave Emission from the HII region RCW175