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Evidence for Inverted‐Spectrum 20 GHz Emission in the Galactic Plane
2007
Astrophysical Journal
A comparison of a 19 GHz full-sky map with the WMAP satellite K band (23 GHz) map indicates that the bulk of the 20 GHz emission within 7 degrees of the Galactic plane has an inverted (rising) spectrum with an average spectral index alpha = 0.21 +/- 0.05. While such a spectrum is inconsistent with steep spectrum synchrotron (alpha ~ -0.7) and flat spectrum free-free (alpha ~ -0.1) emission, it is consistent with various models of electric dipole emission from thermally excited spinning dust
doi:10.1086/516817
fatcat:rvzqfwvshnfsdgdr5n57o6gzki