Anomalous Microwave Emission
Abstract
Description
Improved knowledge of diffuse Galactic emission is important to maximize the scientific return from scheduled CMB anisotropy missions. Cross-correlation of microwave maps with maps of the far-IR dust continuum show a ubiquitous microwave emission component whose spatial distribution is traced by far-IR dust emission. The spectral index of this emission, beta_{radio} = -2.2 (+0.5 -0.7) is suggestive of free-free emission but does not preclude other candidates. Comparison of H-alpha and microwave results show that both data sets have positive correlations with the far-IR dust emission. Microwave data, however, are consistently brighter than can be explained solely from free-free emission traced by H-alpha. This ``anomalous'' microwave emission can be explained as electric dipole radiation from small spinning dust grains. The anomalous component at 53 GHz is 2.5 times as bright as the free-free emission traced by H-alpha, providing an approximate normalization for models with significant spinning dust emission.
10 pages, 4 encapsulated PostScript figures using paspconf and epsf macros. Proceedings of the Sloan Workshop on Microwave Foregrounds, November 14--15 1998, Princeton NJ
10 pages, 4 encapsulated PostScript figures using paspconf and epsf macros. Proceedings of the Sloan Workshop on Microwave Foregrounds, November 14--15 1998, Princeton NJ