Cen A as gamma- and UHE cosmic-ray Source

2011/08/23 by Frank Rieger, F. M. Rieger, Rieger, F. M.
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE) #Radioactive Decay and Measurement Techniques #astro-ph.HE

paper · pdf · doi:10.48550/arxiv.1108.4565

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

arxiv created 2011/08/23 · openalex publication_date 2011/08/23 · arxiv updated 2011/08/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 10¹⁹ eV.

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