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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28469
Title: Astrophysical hints of axion-like particles
Authors: Roncadelli, M.
GALANTI, GIORGIO 
TAVECCHIO, Fabrizio 
Bonnoli, G.
Issue Date: 2015
Journal: IL NUOVO CIMENTO C 
Number: 38
Issue: 1
First Page: 37
Abstract: After reviewing three astrophysical hints of the existence of axion-like 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.
URI: http://hdl.handle.net/20.500.12386/28469
URL: https://www.sif.it/riviste/sif/ncc/econtents/2015/038/01/article/36
ISSN: 2037-4909
DOI: 10.1393/ncc/i2015-15037-x
Bibcode ADS: 2015NCimC..38...37R
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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