Cen A as gamma- and UHE cosmic-ray Source

F. M. Rieger

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arXiv · 1108.4565

Cen A as gamma- and UHE cosmic-ray Source

F. M. Rieger

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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.

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F. M. Rieger. 2011-08-23. Cen A as gamma- and UHE cosmic-ray Source. https://arxiv.org/abs/1108.4565

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