This book contains the proceedings of the June 1991 Heidelberg conference on the Physics of Active Galactic Nuclei. Reviews and many other contributions cover the field of AGN research and focus on our present state of knowledge of the different physical processes that account for the phenomenon. The coverage is oriented towards the physical mechanisms rather than a phenomenological description and is organized in five sections: High-Energy Emitting Regions, Disks and Broad-Line Regions, Extended narrow-Line Regions, Magnetic Fields and Jet Formation, and Unified Schemes and Evolution. Recent spacecraft experiments have enabled the spectral coverage to be completed and thus allow a full analysis of the frequency regime. These new results, incorporated here, considerable modify and complete the empirical input to models and have greatly influenced our present understanding of the relevant physical processes discussed in these proceedings.
