A new Determination of the Extragalactic Background of Diffuse Gamma Rays taking into account Dark Matter Annihilation - AstrophysicsReportar como inadecuado




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Abstract: The extragalactic background (EGB) of diffuse gamma rays can be determined bysubtracting the Galactic contribution from the data. This requires a Galacticmodel (GM) and we include for the first time the contribution of dark matterannihilation (DMA), which was previously proposed as an explanation for theEGRET excess of diffuse Galactic gamma rays above 1 GeV.In this paper it is shown that the newly determined EGB shows acharacteristic high energy bump on top of a steeply falling soft contribution.The bump is shown to be compatible with a contribution from an extragalacticDMA signal from weakly interacting massive particles (WIMPs) with a massbetween 50 and 100 GeV in agreement with the EGRET excess of the Galacticdiffuse gamma rays and in disagreement with earlier analysis. The remainingsoft contribution of the EGB is shown to resemble the spectra of the observedpoint sources in our Galaxy.



Autor: W. de Boer, A. Nordt, C. Sander, V. Zhukov (University of Karlsruhe, Germany)

Fuente: https://arxiv.org/







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