X-rays from the environment of supermassive black holes in active galaxies
Comments invited review, IX. Marcel Grossmann Meeting on General Relativity, Gravitation and Relativistic Field Theories (Rome, July 2000), session: `Astrophysics of Neutron Stars and Black Holes: Observations'; to appear in the online proceedings at http://www.icra.it/MG/mg9/mg9.htm, a 2-page condensate will be published in World Scientific; long and short version are also available at http://www.xray.mpe.mpg.de/~skomossa/