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Search with EGRET for a gamma ray line from the Galactic center

Pullen, Anthony R. and Chary, Ranga-Ram and Kamionkowski, Marc (2007) Search with EGRET for a gamma ray line from the Galactic center. Physical Review D, 76 (6). Art. No. 063006. ISSN 2470-0010. doi:10.1103/PhysRevD.76.063006.

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We search data from the Energetic Gamma Ray Experiment Telescope (EGRET) for a gamma-ray line in the energy range 0.1–10 GeV from the 10°×10° region around the Galactic center. Our null results lead to upper limits to the line flux from the Galactic center. Such lines may have appeared if the dark matter in the Galactic halo is composed of weakly interacting massive particles (WIMPs) in the mass range 0.1–10 GeV. For a given dark-matter-halo model, our null search translates to upper limits to the WIMP two-photon annihilation cross section as a function of WIMP mass. We show that, for a toy model in which Majorana WIMPs in this mass range annihilate only to electron-positron pairs, these upper limits supersede those derived from measurements of the 511-keV line and continuum photons from internal bremsstrahlung at the Galactic center.

Item Type:Article
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URLURL TypeDescription
Chary, Ranga-Ram0000-0001-7583-0621
Kamionkowski, Marc0000-0001-7018-2055
Additional Information:© 2007 The American Physical Society. (Received 12 October 2006; published 17 September 2007) We thank S. Profumo for useful discussions and comments and J. Beacom for useful comments on an earlier draft. A.R.P. was supported by the NSF. R.C. was partially funded under NASA Contract No. 1407. M.K. was supported by DOE DE-FG03-92-ER40701, NASA NNG05GF69G, and the Gordon and Betty Moore Foundation.
Group:Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-92-ER40701
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:PULprd07c
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9222
Deposited By: Archive Administrator
Deposited On:27 Nov 2007
Last Modified:08 Nov 2021 20:57

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