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Abstract: Astrophysical gamma-ray sources come in a variety of sizes andmagnetizations. We deduce general conditions under which gamma-ray spectra fromsuch sources would be significantly affected by axion-photon mixing. We showthat, depending on strength and coherence of the magnetic field, axioncouplings down to ~ 1-10**13 GeV can give rise to significant axion-photonconversions in the environment of accreting massive black holes. Resonances canoccur between the axion mass term and the plasma frequency term as well asbetween the plasma frequency term and the vacuum Cotton-Mouton shift. Bothresonances and non-resonant transitions could induce detectable features oreven strong suppressions in finite energy intervals of gamma-ray spectra fromactive galactic nuclei. Such effects can occur at keV to TeV energies forcouplings that are currently allowed by all experimental constraints.



Author: Kathrin A. Hochmuth MPI Munich, Guenter Sigl APC and IAP, Paris

Source: https://arxiv.org/



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