Evidence for a Galactic gamma ray halo

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  • 20 March 1998
Abstract
We present quantitative statistical evidence for a gamma-ray emission halo surrounding the Galaxy. Maps of the emission are derived. EGRET data were analyzed in a wavelet-based non-parametric hypothesis testing framework, using the expected diffuse (Galactic + isotropic) emission as a null hypothesis. The results show a statistically significant large scale halo surrounding the Milky Way as seen from Earth. The halo flux at high latitudes is somewhat smaller than the isotropic gamma-ray flux at the same energy, though of the same order (O(10^{-6}) ph cm^{-2} s^{-1} sr^{-1} above 1 GeV).

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