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Paper detail

Very-high-energy quasars hint at ALPs

One of the mysteries of very-high-energy (VHE) astrophysics is the observation of flat spectrum radio quasars (FSRQs) above about 30 GeV, because at those energies their broad line region should prevent photons produced by the central engine to escape. Although a few astrophysical explanations have been put forward, they are totally ad hoc. We show that a natural explanation emerges within the conventional models of FSRQs provided that photon-ALP oscillations take place inside the source for the model parameters within an allowed range.

preprint2013arXivOpen access
Marco RoncadelliGiorgio GalantiFabrizio TavecchioGiacomo Bonnoli
astro-ph.COhep-phastro-ph.HE
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Marco RoncadelliGiorgio GalantiFabrizio TavecchioGiacomo Bonnoli

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