The EGRET excess of diffuse gamma rays and the galactic dark matter halo

Physics – High Energy Physics

Scientific paper

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Halo, Structure, Rotation Curve, Dwarf Galaxies, Dark Matter Mass, Baryonic Mass, Structure Formation, Dma, Neutralinos, Supersymmetry

Scientific paper

The public data from the EGRET space telescope on diffuse galactic gamma rays in the energy range from 0.1 to 10GeV are reanalyzed with the purpose of searching for signals of dark matter annihilation (DMA). The analysis confirms the previously observed excess for energies above 1GeV in comparison with the expectations from conventional galactic models. In addition, the excess was found to show all the key features of a signal from DMA: (a) the excess is observable in all sky directions and has the same shape everywhere, thus pointing to a common source; (b) the shape corresponds to the expected spectrum of the annihilation of non-relativistic massive particles (50 90GeV) into neutral π0 mesons, which decay into photons; (c) the excess traces the dark matter (DM) distribution in our galaxy, as proven by the reconstruction of the rotation curve from the intensity of the gamma ray excess.

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