NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-19 T11:46:28 PDT
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For refcode 2013ApJ...762L..22H:
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2013ApJ...762L..22H Evidence for Indirect Detection of Dark Matter from Galaxy Clusters in Fermi gamma-Ray Data Hektor, A.; Raidal, M.; Tempel, E. Abstract. Using the Fermi Large Area Telescope (LAT) we search for spectral features in gamma-rays coming from regions corresponding to the 18 brightest nearby galaxy clusters determined by the magnitude of their signal line-of-sight integrals. We observe a double-peak-like excess over the diffuse power-law background at photon energies of 110 GeV and 130 GeV with a global statistical significance of up to 3.6sigma, independently confirming earlier claims of the same excess from the Galactic center. Interpreting this result as a signal of dark matter annihilations to two monochromatic photon channels in galaxy cluster halos, and fixing the annihilation cross-section from the Galactic center data, we determine the annihilation boost factor due to dark matter subhalos from the data. Our results contribute to a discrimination of the dark matter annihilations from astrophysical processes and from systematic detector effects, offering them as possible explanations for the Fermi-LAT excess. Key words: astroparticle physics, dark matter, galaxies: clusters: general, gamma rays: galaxies: clusters, methods: data analysis
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