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International Workshop on Beamed and Unbeamed Gamma-Rays from Galaxies, Muonio : Finland (2011)
Unbeamed γ-rays from low luminosity AGNs
A. Niedźwiecki, F. Xie, V. Beckmann1

Proton-proton collisions in two-temperature accretion flows may lead to substantial γ-ray emission through neutral pion production and decay. We present preliminary results of our study of such a hadronic γ-ray emission. We find that radiatively inefficient flows around rapidly rotating black holes can produce the MeV/GeV luminosities up to ~ 1044 erg s-1. The hot-flow model predictions for the hadronic and the Comptonization components can put interesting constraints on the properties of the source of high-energy radiation in AGNs. As an example, we compare our model with X/γ-ray observations of Centaurus A and we find that the model with a maximally rotating black hole strongly overpredicts the γ-ray flux.
1:  APC - UMR 7164 - AstroParticule et Cosmologie
Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics

Sciences of the Universe/Astrophysics/Cosmology and Extra-Galactic Astrophysics