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Graziano Chiaro, Bindu Rani, David Thompson, Giovanni La Mura, Richard Mushotzky, Patrizia Caraveo.
Misaligned Active Galactic Nuclei (MAGNs) are mainly radio galaxies of type FRI or FRII and Steep Spectrum Radio Quasars (SSRQs), which show jets of radiation oriented away from the observer line of sight. MAGNs are very numerous and well studied in the lower energies of the electromagnetic spectrum but are not commonly observed in the GeV and TeV energy range, because their inclination leads to the loss of relativistic boosting of the jet emission. The new Cherenkov Telescope Array (CTA) will improve orders of magnitude in sensitivity respect the present generation of ground Cherenkov telescopes ( IACTs) opening new frontiers for high energies studies of MAGNs. CTA detection of MAGNs will give more about the origin and location of TeV emission, possible emission models and if these radio galaxies could be the sources of high-energy neutrinos.
In 8 years of monitoring, the Fermi-LAT has detected more than 40 radio galaxies, leading to the opportunity to investigate the high energy emission in a much better detail than the one achievable with blazars. A handful fo these sources have also been detected at TeV energies. Despite their intensive study the physical processes responsible for their high-energy emission still remain unclear. We performed here a multi-wavelength correlation study of the GeV detected radio galaxies to probe gamma-ray emitting sites and emission processes in these sources. We also assess the possibility of direct investigation of the Very High Energy (VHE) emission and of its connection to the production of high-energy particles, comparing models based on Fermi-LAT data with the performances of current and future ground Cherenkov telescope facilities.