Evidence for a Galactic gamma ray halo

Details Evidence for a Galactic gamma ray halo Evidence for a Galactic gamma ray halo

1998-03-20

arxiv.org/abs/astro-ph/9803237v2

New Astron. 3 (1998) 539

Astronomy and Astrophysics

Astrophysics

Final version accepted for publication in New Astronomy. Some additional results/discussion included, along with entirely revi

Scientific paper

10.1016/S1384-1076(98)00024-4

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 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 gamma-ray flux at the same energy, though of the same order (O(10^(-7)--10^(-6)) ph/cm^2/s/sr above 1 GeV).

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