Radio Galaxies at VHE energies

Abstract

Radio Galaxies have by now emerged as a new $\gamma$-ray emitting source class on the extragalactic sky. Given their remarkable observed characteristics, such as unusual gamma-ray spectra or ultrafast VHE variability, they represent unique examples to probe into the nature and physics of AGN in general. This review provides a compact summary of their observed characteristics at very high $\gamma$-ray energies (VHE; $>100$ GeV) along with a discussion of their possible physics implications. A particular focus is given to a concise overview of fundamental concepts concerning the origin of variable VHE emission, including recent developments in black hole gap physics.

Invited review article, submitted to Galaxies; review, 21 pages, 14 figures; small typos corrected and references fixed to match accepted version

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Cited by in corpus (26)

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• The TeV-emitting radio galaxy 3C 264. VLBI kinematics and SED modeling
• Active Galactic Nuclei as potential Sources of Ultra-High Energy Cosmic Rays
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• Very High-energy Gamma-Ray Episodic Activity of Radio Galaxy NGC 1275 in 2022-2023 Measured with MACE
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• Driven Collisionless Reconnection of Force-free Flux Tubes: From Onset to Coalescence