Electromagnetic cascades propagating from low-redshift blazars

M. ORELLANA; L. PELLIZA; G. E. ROMERO; M. TUEROS; M. C. MEDINA; S. PEDROSA

Cordoba

Congreso; Reunion Anual de la Asociación Argentina de Astronomía (N° 57); 2014

It has been established that the Extragalactic Background Light attenuates the very high-energy photons emitted by blazars through pair production. The pairs are deflected by the Extragalactic Magnetic Field (EGMF) and cooled down by Inverse Compton scattering with the Cosmic Microwave Background (CMB) photons while they develope an electromagnetic cascade. The EGMF may also take out energy from the pairs in the form of synchrotron radiation. The originally emitted spectrum, the source extent and the arriving time of the photons are modified by such cascades. In order to study this problem we assume the blazar original emission to follow a power-law with exponential cutoff, and track the three-dimensional trajectories of each particle and photon in the cascade. Here we report on the status of our numerical simulations regarding the gamma-ray propagation through ∼ 100 Mpc scales, making focus on the construction of the outcoming spectrum which is the result of the energy conservation and thus combines the information from the different channels of energy losses. Distinct spectra arise when varying the EGMF strength.