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The effect of photon-axion-like particle conversions in galaxy clusters on very high energy γ-ray spectra

Very high energy (VHE, energy >~ 100 GeV) γ-rays originating from extragalactic sources interact with low energy photons of background radiation fields and produce electron-positron pairs. Alternatively, in the presence of ambient magnetic fields, they can convert into hypothetical axion-like particles (ALPs), pseudo-scalar spin-0 bosons, predicted by extensions of the standard model. These particles propagate unimpeded over cosmological distances. Here, the effect of photon-ALP oscillations in magnetic fields of galaxy clusters and the Milky Way on VHE γ-ray spectra is studied. It is shown that this mechanism can lead to a substantial enhancement of the VHE flux and a spectral hardening, thus effectively reducing the opacity of the Universe to VHE γ-rays.

preprint2012arXivOpen access
Manuel MeyerDieter HornsLuca MaccioneAlessandro MirizziDaniele MontaninoMarco Roncadelli
hep-phastro-ph.HE
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Manuel MeyerDieter HornsLuca MaccioneAlessandro MirizziDaniele MontaninoMarco Roncadelli

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