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The main properties of AGN are reviewed, focussing on the accretion processand on the question of whether AGN are the best factories of ultra high energyparticles and photons. I recall the large differences between theaccretion/ejection flows in strong and weak accretors, and I conclude that,since low luminosity AGN and even "dormant" massive black holes in nuclei ofgalaxies are powering strong confined magnetized jets able to accelerate highenergy particles, and are present in a large proportion of galaxies, they mightbe better potential sources of high energy particles and photons than luminousAGN and powerful radio galaxies.

Are AGN the Best Factories for High Energy Particles and Photons?