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Gamma-ray constraints on the infrared background excess

Salvaterra, R.; Ferrara, A.; Mapelli, M.

Motivated by the idea that the recently detected near-infrared (1.2-4 µm) excess over the contribution of known galaxies is due to redshifted light from the first cosmic stars [MNRAS 339 (2003) 973], we have used the effect caused by photon-photon absorption on gamma-ray spectra of blazars to put constraints on extragalactic background light…