# The AGN phenomenon: open issues

@article{Beckmann2012TheAP,
title={The AGN phenomenon: open issues},
author={Volker Beckmann and Chris R. Shrader Francois Arago Centre Apc Paris and NasaGsfc},
journal={arXiv: High Energy Astrophysical Phenomena},
year={2012}
}
• Published 6 February 2013
• Physics
• arXiv: High Energy Astrophysical Phenomena
The aim of this short paper is to motivate and encourage research in the field of Active Galactic Nuclei (AGN). Here we summarize the main open questions concerning the central engine. Is the central black hole rapidly spinning and can we prove this? What is the dominant accretion mechanism in AGN? Why do some AGN form jets while others don't and how do the jets originate? What keeps jets collimated out to distances of 100 kpc? Is the emission of blazars dominated rather by synchrotron self…

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