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Search for features in the cosmic-ray electron and positron spectrum measured by the Fermi Large Area Telescope

By M.N. Mazziotta, F. Costanza, A. Cuoco, F. Gargano, F. Loparco and S. Zimmer


International audienceThe Large Area Telescope onboard the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events. Possible features in their energy spectrum could be a signature of the presence of nearby astrophysical sources or of more exotic sources, such as annihilation or decay of dark matter (DM) particles in the Galaxy. In this paper, for the first time we search for a deltalike line feature in the cosmic-ray electron and positron spectrum. We also search for a possible feature originating from DM particles annihilating into electron-positron pairs. Both searches yield negative results, but we are able to set constraints on the line intensity and on the velocity-averaged DM annihilation cross section. Our limits extend up to DM masses of 1.7  TeV/c2 and exclude the thermal value of the annihilation cross section for DM lighter than 150  GeV/c2

Topics: galaxy, exotic, GLAST, thermal, signature, energy spectrum, electron positron, dark matter: mass, Dark Matter, dark matter: decay, dark matter: annihilation, positron: cosmic radiation, cross section: annihilation, electron: cosmic radiation, Cosmic-ray Electrons and Positrons, S030DMA, 95.85.Ry, 95.35.+d, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Publisher: 'American Physical Society (APS)'
Year: 2018
DOI identifier: 10.1103/PhysRevD.98.022006
OAI identifier: oai:HAL:hal-01839753v1
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