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Very high energy (VHE $>$100 GeV) gamma rays coming from blazars can producepairs when interacting with the Extragalactic Background Light (EBL) and theCosmic Microwave Background, generating an electromagnetic cascade. Dependingon the Intergalactic Magnetic Field (IGMF) intensity, this cascade may resultin an extended isotropic emission of photons around the source (halo), or in abroadening of the emission beam. The detection of these effects might lead toimportant constrains both on the IGMF intensity and the EBL density, quantitiesof great relevance in cosmological models. Using a Monte Carlo program, wesimulate electromagnetic cascades for different values of the IGMF intensitiesand coming from a source similar to 1ES0229+200, a blazar with hard intrinsicspectrum at redshift $z=0.14$, which is an ideal distance for potentiallyobserving the effect. We study the possible response of a generic futureCherenkov telescope using a simplified model for the sensitivity, effectivearea and angular resolution. Finally, combining these instrument properties, wecalculate the angular distribution of photons and develop a method to test thestatistical feasibility of detecting the effect in the near future.

Detecting extended gamma-ray emission with the next generation Cherenkov telescopes