Journal
GALAXIES
Volume 6, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/galaxies6040116
Keywords
gamma-rays; radio galaxies; emission: non-thermal; origin: jet; origin: black hole
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Funding
- DFG Heisenberg Fellowship [RI 1187/6-1]
- Israel Science Foundation [1114/17]
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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 the nature and physics of active galactic nuclei (AGN) in general. This review provides a compact summary of their observed characteristics at very high gamma-ray energies (VHE; greater than 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.
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