# Search for an extended emission around blazars with the MAGIC telescope - Astrophysics > High Energy Astrophysical Phenomena

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Abstract: Very high energy gamma rays coming from extra-galactic sources can interactwith intergalactic radiation fields. This process may result in electromagneticcascades with the following cycle: the production of electron-positron pairsand then secondary gamma-rays due to inverse Compton scattering. Sinceelectrons and positrons will be scattered in the intergalactic magnetic field,under certain conditions their radiation may be redirected towards theobserver. Thus one can anticipate that the secondary gamma-ray emission mayproduce an apparent extended halo around the source.MAGIC is an Imaging Atmospheric Cerenkov Telescope located on Canary islandof La Palma at Roque de los Muchachos Observatory 2200 m.a.s.l. Varioussource sizes and extended emission profiles within \$1^\circ\$ diameter have beenstudied by using dedicated Monte Carlo simulations for the MAGIC telescope. Wepresent results of the study of a possible extended emission for Mrk 421 andMrk501 done with the MAGIC telescope.

Autor: Julian Sitarek, Razmik Mirzoyan, for the MAGIC Collaboration

Fuente: https://arxiv.org/