Abstract
Recently, an analysis of data from the Fermi Gamma Ray Space Telescope has revealed a flux of gamma rays concentrated around the inner 0.5 degrees of the Milky Way, with a sharply peaked spectrum at 2---4 GeV. Interpreted as the products of annihilating dark matter, this implies a dark matter particle with mass between 7.3 and 9.2 GeV annihilating primarily to charged leptons. This is comparable to the mass range required to fit signals reported by CoGeNT and DAMA/LIBRA. In addition to gamma rays, dark matter is predicted to produce energetic electrons and positrons which emit synchrotron while propagating through the galactic magnetic field. In this letter, we calculate the flux and spectrum of this synchrotron emission and compare the results to measurements from the WMAP satellite. We find that a sizable flux of hard synchrotron emission is predicted in this scenario, and that this can easily account for the observed intensity, spectrum, and morphology of the "WMAP haze.''
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