Document Type

Article

Publication Date

Summer 8-19-1998

Publication Title

New Astronomy

Publisher

Elsevier

Abstract

We present quantitative statistical evidence for a γ-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 a model of expected diffuse (Galactic + isotropic) emission as a null hypothesis. The results show a statistically significant large scale halo surrounding the center of the Milky Way as seen from Earth. The halo flux at high latitudes is somewhat smaller than the isotropic γ-ray flux at the same energy, though of the same order (O(10−7–10−6) ph cm−2 s−1 sr−1 above 1 GeV).

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