Cen A as gamma- and UHE cosmic-ray Source

Details Cen A as gamma- and UHE cosmic-ray Source Cen A as gamma- and UHE cosmic-ray Source

2011-08-23

arxiv.org/abs/1108.4565v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

based on talk at Frascati Workshop 2011 (Vulcano, Italy, 23th - 28th May); to appear in Mem. SAIt., F. Giovannelli and L. Saba

Scientific paper

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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