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- W3099254654 abstract "Discoveries of very high energy (VHE) photons from distant blazars suggest that, after correction by extragalactic background light (EBL) absorption, there is a flatness or even a turn-up in their spectra at the highest energies that cannot be easily explained by the standard framework. Here, it is shown that a possible solution to this problem is achieved by assuming the existence of axion-like particles (ALPs) with masses ∼ 1 neV. The ALP scenario is tested making use of observations of the highest redshift blazars known in the VHE energy regime, namely 3C 279, 3C 66A, PKS 1222+216 and PG 1553+113. In all cases, better fits to the observed spectra are found when including ALPs rather than considering EBL only. Interestingly, quite similar critical energies for photon/ALP conversions are also derived, independently of the source considered." @default.
- W3099254654 created "2020-11-23" @default.
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- W3099254654 date "2011-11-11" @default.
- W3099254654 modified "2023-10-12" @default.
- W3099254654 title "Axion-like particle imprint in cosmological very-high-energy sources" @default.
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- W3099254654 doi "https://doi.org/10.1088/1475-7516/2011/11/020" @default.
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