Abstract
We present the results of Monte Carlo simulations of three-dimensional electromagnetic cascade initiated by interactions of the multi-TeV 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 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 to if they exist in the voids of the large scale structure.
1 More- Received 24 March 2009
DOI:https://doi.org/10.1103/PhysRevD.80.023010
©2009 American Physical Society