期刊
ADVANCES IN SPACE RESEARCH
卷 43, 期 3, 页码 335-341出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2008.10.025
关键词
Gamma-ray sources; Background radiations; Axions
类别
资金
- DOE
- NASA [NAG5-10842]
- United States Department of Energy [DE-AC02-07CH 11359]
We propose that axion-like particles (ALPs) with a two-photon vertex, consistent with all astrophysical and laboratory bounds, may lead to effects in the spectra of high-energy gamma-ray sources detectable by satellite or ground-based telescopes. We discuss two kinds of signatures: (i) a peculiar spectral depletion due to gamma rays being converted into ALPs in the magnetic fields of efficient astrophysical accelerators according to the Hillas criterion, such as jets of active galactic nuclei or hot spots of radio galaxies; (ii) an appearance of otherwise invisible sources in the GeV or TeV sky due to back-conversion of an ALP flux (associated with gamma-ray emitters suffering some attenuation) in the magnetic field of the Milky Way. These two mechanisms might also provide an exotic way to avoid the exponential cutoff of very high energy gamma-rays expected due to the pair production onto the extragalactic background light. (C) 2008 COSPAR. Published by Elsevier Ltd. All rights reserved.
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