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Revisiting the Indication for a low opacity Universe for very high energy gamma-rays

Very high energy (VHE, energy >~ 100 GeV) γ-rays undergo pair production with photons of the extragalactic background light (EBL). Thus, the intrinsic γ-ray flux of cosmological sources is attenuated and the Universe should be opaque to γ-rays above a redshift dependent energy. Recently, an indication has been found that the Universe is more transparent than predicted by a lower-limit EBL model. Here, this indication is confronted with additional VHE γ-ray spectra and different EBL models. Depending on the model for the opacity, the indication persist between a ~2.6 σ and ~4.3 σ confidence level.

preprint2013arXivOpen access
Manuel MeyerDieter HornsMartin Raue
astro-ph.COastro-ph.HE
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Manuel MeyerDieter HornsMartin Raue

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