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Physical Review D 80 (2009) 23010
Gamma-ray induced cascades and magnetic fields in the intergalactic medium
A. Elyiv1, A. Neronov2, D.V. Semikoz3

We present the results of Monte Carlo simulations of three-dimensional electromagnetic cascade initiated by interactions of the multi-TeV γ 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°-10° scale emission at multi-GeV and TeV energies around extragalactic sources of very high-energy γ 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 ≤10-16G to 10-12G if they exist in the voids of the large scale structure.
1 :  MAO - Main Astronomical Observatory
2 :  ISDC - INTEGRAL Science Data Center
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
gamma-ray – Electric and magnetic fields – Observational cosmology
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