Excess in EGRET Data on Diffuse Gamma Rays:. a Signal of Dark Matter Annihilation?

Details Excess in EGRET Data on Diffuse Gamma Rays:. a Signal of Dark Matter Annihilation? Excess in EGRET Data on Diffuse Gamma Rays:. a Signal of Dark Matter Annihilation?

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iche.conf..411d&link_type=abstract

HIGH ENERGY PHYSICS, ICHEP 2004. Proceedings of the 32nd International Conference. Held 16-22 August 2004 in Beijing, China. Edi

Physics

High Energy Physics

Scientific paper

The diffuse galactic EGRET gamma ray data show a clear excess for energies above 1 GeV in comparison with the expectations from conventional galactic models. The excess is seen with a similar spectrum in all sky directions, as expected for Dark Matter (DM) annihilation. The energy spectrum of the excess is used to limit the WIMP mass to the 50-100 GeV range, while the sky maps are used to determine the halo structure, which is consistent with a triaxial isothermal halo with additional enhancement of Dark Matter in the disc. The latter is strongly correlated with the ring of stars around our galaxy at a distance of 14 kpc, thought to originate from the tidal disruption of a dwarf galaxy. It is shown that this ring of DM causes the mysterious change of slope in the rotation curve at R = 1.1 · R0.

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