Astrophysical hints of axion-like particles

Roncadelli, M. and Galanti, G. and Tavecchio, F. and Bonnoli, G. (2015) Astrophysical hints of axion-like particles. Il nuovo cimento C, 38 (1). pp. 1-5. ISSN 1826-9885

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After reviewing three astrophysical hints of the existence of axionlike particles (ALPs), we describe in more detail a new similar hint involving flat spectrum radio quasars (FSRQs). Detection of FSRQs above about 20GeV pose a challenge to very-high-energy (VHE) astrophysics, because at those energies the ultraviolet emission from their broad line region should prevent photons produced by the central engine to leave the source. Although a few astrophysical explanations have been put forward, they are totally ad hoc. We show that a natural explanation instead arises within the conventional models of FSRQs provided that photon-ALP oscillations occur inside the source. Our analysis takes the FSRQ PKR 1222+206 as an example, and it looks tantalizing that basically the same choice of the free model parameters adopted in this case is consistent with those that provide the other three hints of the existence of ALPs.

Item Type: Article
Uncontrolled Keywords: Axions and other Nambu-Goldstone bosons (Majorons, familons, etc.) ; γ-ray ; Neutrino, muon, pion, and other elementary particles; cosmic rays
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 26 May 2020 10:14
Last Modified: 26 May 2020 10:14

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