2009/03/21 by A. Elyiv, A. Neronov, D. Semikoz · 7 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #astro-ph.CO #astro-ph.HE
paper · pdf · doi:10.1103/physrevd.80.023010
published as Phys.Rev.D80:023010,2009 · 11 pages, 8 figures
arxiv created 2009/03/21 · openalex publication_date 2009/07/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present the results of Monte Carlo simulations of three-dimensional electromagnetic cascade initiated by interactions of the multi-TeV \ensuremathγ rays with the cosmological infrared/optical photon background in the intergalactic medium. Secondary electrons in the cascade are deflected by the intergalactic magnetic fields before they scatter on CMB photons. This leads to extended 0.1\ifmmode^∘\else\textdegree\fi--10\ifmmode^∘\else\textdegree\fi scale emission at multi-GeV and TeV energies around extragalactic sources of very high-energy \ensuremathγ rays. The morphology of the extended emission depends, in general, on the properties of magnetic fields in the intergalactic medium. Using Monte Carlo simulated data sets, we demonstrate that the decrease of the size of extended source with the increase of energy allows to measure weak magnetic fields with magnitudes in the range from \ensuremath≤10^\ensuremath-16 G to 10^\ensuremath-12 G if they exist in the voids of the large scale structure.