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Gamma-ray signatures of annihilation to charged leptons in dark matter substructure

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/48011

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Title: Gamma-ray signatures of annihilation to charged leptons in dark matter substructure
Creators: Kistler, Matthew D.; Siegal-Gaskins, Jennifer M.
Issue Date: 2010-05-18
Publisher: American Physical Society
Citation: Matthew D. Kistler, Jennifer M. Siegal-Gaskins, "Gamma-ray signatures of annihilation to charged leptons in dark matter substructure," Physical Review D 81, no. 10 (2010), doi:10.1103/PhysRevD.81.103521
DOI: 10.1103/PhysRevD.81.103521
Abstract: Because of their higher concentrations and small internal velocities, Milky Way subhalos can be at least as important as the smooth halo in accounting for the GeV positron excess via dark matter annihilation. After showing how this can be achieved in various scenarios, including in Sommerfeld models, we demonstrate that, in this case, the diffuse inverse-Compton emission resulting from electrons and positrons produced in substructure leads to a nearly-isotropic signal close to the level of the isotropic GeV gamma-ray background seen by Fermi. Moreover, we show that HESS cosmic-ray electron measurements can be used to constrain multi-TeV internal bremsstrahlung gamma rays arising from annihilation to charged leptons.
ISSN: 1550-2368
URI: http://hdl.handle.net/1811/48011
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