Electromagnetic cascades propagating from low-redshift blazars

ORELLANA, M.; PELLIZZA, L.J.; ROMERO, G.E.; TUEROS, M.; MEDINA, M.C.; PEDROSA, S.E.

Córdoba

Congreso; 57 Reunión de la Asociación Argentina de Astronomía; 2014

IATE-OAC

It has been established that the Extragalactic Background Light attenuates the very high-energyphotons emitted by blazars through pair production. The pairs are de ected by the Extragalactic Magnetic Field(EGMF) and cooled down by Inverse Compton scattering with the Cosmic Microwave Background (CMB) photonswhile they develope an electromagnetic cascade. The EGMF may also take out energy from the pairs in the formof synchrotron radiation. The originally emitted spectrum, the source extent and the arriving time of the photonsare modied by such cascades. In order to study this problem we assume the blazar original emission to follow apower-law with exponential cuto, and track the three-dimensional trajectories of each particle and photon in thecascade. In this work we describe the results of numerical simulations regarding the  -ray propagation through 100 Mpc scales, making focus on the construction of the outcoming spectrum which esults from the energyconservation and thus combines the information from the dierent channels of energy losses. Dierent spectraarise when varying the EGMF strength.