TY - JOUR
T1 - Time dependence of AGN pair echo, and halo emission as a probe of weak extragalactic magnetic fields
AU - Oikonomou, Foteini
AU - Murase, Kohta
AU - Kotera, Kumiko
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).
PY - 2017
Y1 - 2017
N2 - Gamma-rays with energy exceeding 100 GeV emitted by extragalactic sources initiate cascades in the intergalactic medium. The angular and temporal distribution of the cascade photons that arrive at the Earth depend on the strength and configuration of extragalactic magnetic fields in the line of sight. For weak enough fields, extended emission around the source (halo) is expected to be detectable, and the characteristics (angular size, energy dependence, and shape) of this emission are a sensitive probe of EGMF strength and correlation length. We model the expected spectra and angular profiles of blazars in a range of parameter space of the extra-galactic magnetic field strength and correlation length, which is unconstrained by existing measurements.
AB - Gamma-rays with energy exceeding 100 GeV emitted by extragalactic sources initiate cascades in the intergalactic medium. The angular and temporal distribution of the cascade photons that arrive at the Earth depend on the strength and configuration of extragalactic magnetic fields in the line of sight. For weak enough fields, extended emission around the source (halo) is expected to be detectable, and the characteristics (angular size, energy dependence, and shape) of this emission are a sensitive probe of EGMF strength and correlation length. We model the expected spectra and angular profiles of blazars in a range of parameter space of the extra-galactic magnetic field strength and correlation length, which is unconstrained by existing measurements.
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U2 - 10.22323/1.301.0869
DO - 10.22323/1.301.0869
M3 - Conference article
AN - SCOPUS:85087228838
SN - 1824-8039
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 35th International Cosmic Ray Conference, ICRC 2017
Y2 - 10 July 2017 through 20 July 2017
ER -