A multi-wavelength view of Active Galactic Nuclei with an emphasis on gamma-rays
Abstract
Active Galactic Nuclei (AGN) are remarkable astronomical sources emitting over the whole electromagnetic spectrum, with different bands providing unique windows on distinct sub-structures and their related physics. AGN come in a large number of types only partially related to intrinsic differences. I highlight here the most important AGN classes, namely jetted and non-jetted, radiatively efficient and inefficient, and face-on and edge-on, the source types selected by different bands together with the most important selection effects and biases, and the underlying emission processes, emphasising the gamma-ray band. I then conclude with a look at some open issues in AGN research and at the main new astronomical facilities, which will provide us with new data to tackle them.
Keywords
Cite
@article{arxiv.2302.12540,
title = {A multi-wavelength view of Active Galactic Nuclei with an emphasis on gamma-rays},
author = {Paolo Padovani},
journal= {arXiv preprint arXiv:2302.12540},
year = {2023}
}
Comments
Invited talk at the 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy, July 4-8, 2022, Barcelona, Spain. 13 pages, 1 figure. To appear in Proceedings of Science