Robust Identification of Isotropic Diffuse Gamma Rays from Galactic Dark Matter

Creators: Siegal-Gaskins, Jennifer M.; Pavlidou, Vasiliki

Abstract

Dark matter annihilation in Galactic substructure will produce diffuse gamma-ray emission of remarkably constant intensity across the sky, making it difficult to disentangle this Galactic dark matter signal from the extragalactic gamma-ray background. We show that if Galactic dark matter contributes a modest fraction of the measured emission in an energy range accessible to the Fermi Gamma-ray Space Telescope, the energy dependence of the angular power spectrum of the total measured emission could be used to confidently identify gamma rays from Galactic dark matter substructure.

Additional Information

©2009 The American Physical Society. Received 23 January 2009; published 18 June 2009. We are extremely grateful to John Beacom and Stephan Meyer for valuable comments and suggestions, and we thank Shin'ichiro Ando, Stefano Profumo, Luis Reyes, and Tonia Venters for helpful discussions. We also thank the organizers and participants of the ''Novel Searches for Dark Matter'' workshop hosted by CCAPP at The Ohio State University for stimulating interactions that inspired this work. V. P. acknowledges the support of NASA through GLAST, NASA Cooperative Agreement: NNG06DO90A. # 95.35.+d Dark matter (stellar, interstellar, galactic, and cosmological) # 95.85.Pw γ-ray astronomical observations # 98.35.Gi Milky Way galaxy halo # 98.70.Rz Cosmic γ-ray sources; γ-ray bursts

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Robust Identification of Isotropic Diffuse Gamma Rays from Galactic Dark Matter

Abstract

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