Recent analyses of very high energy (VHE; >100 GeV) blazar spectra have shown evidence for an excess of γ-rays when attenuation by extragalactic background light (EBL) is expected to be high. A possible explanation for this anomaly is secondary γ-rays from ultra-high-energy cosmic rays (UHECRs) interacting with background photons. If the intergalactic magnetic field strength is sufficiently small, these UHECRs could travel straight enough for long enough that the secondary VHE γ-rays would appear point-like for existing imaging atmospheric Cherenkov telescopes. We will show results from a study using the publicly available UHECR propagation code CRPropa to investigate the cosmic-ray power and spectrum required to account for the anomaly as well as the impact of a range of EBL models.
|Original language||English (US)|
|Title of host publication||Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013|
|Publisher||Sociedade Brasileira de Fisica|
|State||Published - 2013|
|Event||33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil|
Duration: Jul 2 2013 → Jul 9 2013
|Name||Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013|
|Other||33rd International Cosmic Rays Conference, ICRC 2013|
|City||Rio de Janeiro|
|Period||7/2/13 → 7/9/13|
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Copyright 2018 Elsevier B.V., All rights reserved.
- Gamma rays