Diffuse $\gamma$-rays and $\bar{p}$ flux from dark matter annihilation -- a model for consistent results with EGRET and cosmic ray data

Abstract

In this work we develop a new propagation model for the Galactic cosmic rays based on the GALPROP code, including contributions from dark matter annihilation. The model predicts compatible Galactic diffuse $\gamma$ ray spectra with EGRET data in all sky regions. It also gives consistent results of the diffuse $\gamma$ ray longitude and latitude distributions. Further the results for B/C, ${}^{10}$Be/${}^9$Be, proton, electron and antiproton spectra are also consistent with cosmic ray measurements. In the model we have taken a universal proton spectrum throughout the Galaxy without introducing large fluctuation for the proton energy loss is negligible. The dark matter annihilation signals are `boosted' after taking the contribution from subhalos into account. Another interesting feature of the model is that it gives better description of the diffuse $\gamma$ rays when taking the source distribution compatible with supernova remnants data, which is different from previous studies.

29 pages, 13 figures; the published version

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• Galactic diffuse gamma rays --- recalculation based on the new measurements of cosmic electron spectrum
• The diffuse GeV-TeV $\gamma$-ray emission of the Cygnus region
• Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: I. galaxy cluster
• Perspective of Galactic dark matter subhalo detection on Fermi from the EGRET observation