Cen A as TeV gamma-ray and possible UHECR source

Rieger, Frank

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Cen A as TeV gamma-ray and possible UHECR source

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Rieger, Frank
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Rieger, F. (2009). Cen A as TeV gamma-ray and possible UHECR source. Talk presented at Searching for the Origins of Cosmic Rays. Trondheim, Norway. 2009-06-15 - 2009-06-18.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-7550-3

Abstract

We review the latest H.E.S.S. results on Cen~A and describe an acceleration mechanism operating close to the black hole that could account for the observed TeV characteristics. We discuss the implications for Cen A as a possible UHECR proton source and argue that conventional acceleration scenarios seem to face serious challenges to account for proton energies beyond 5 \times $10^{19} eV. We suggest that the operation of an additional mechanism (shear) could allow to boost proton energies beyond this limit.