Cen A as gamma- and UHE cosmic-ray Source

Rieger, F. M.

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Cen A as gamma- and UHE cosmic-ray Source

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

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1108.4565
(Preprint), 177KB

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Rieger, F. M. (2012). Cen A as gamma- and UHE cosmic-ray Source. Memorie della Societa Astronomica Italiana, 83, 127.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-B5AB-E

Abstract

Cen A has been recently detected in the high-energy (HE) and very high energy (VHE) gamma-ray domain by Fermi-LAT and H.E.S.S. We review the observed characteristics and suggest a scenario where the VHE emission originates from the vicinity of the black hole. Motivated by the possible association of some ultra-high energy (UHE) cosmic ray (CR) events with Cen A, we further analyze the acceleration efficiency for a number of a mechanisms (including shock and stochastic acceleration), showing that most of them (apart perhaps from shear) have serious difficulties in accelerating protons beyond a few $10^{19}$ eV.