ar X iv : a st ro - p h / 99 02 30 7 v 1 2 2 Fe b 19 99 Anomalous Microwave Emission
نویسنده
چکیده
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, β radio = −2.2 +0.5 −0.7 , is suggestive of free-free emission but does not preclude other candidates. Comparison of Hα 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 Hα. 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 Hα, providing an approximate normalization for models with significant spinning dust emission.
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