2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/7646We present the results of new XMM observations of FR-I and FR-II radio galaxies that show the importance of jet/environment interactions for both radio-source structure and the properties of the surrounding gas. The FR-I observations reveal that the distribution of hot gas determines the radio-lobe morphology, and provide evidence that the subsonic expansion of the lobes heats the surrounding gas. The FR-II observations show that the sources are at equipartition and in pressure balance with their surroundings. Finally, we present an analysis of a sample of elliptical-dominated groups, showing that radio-source heating is common.8 pages, 3 figures. To appear in "X-ray and Radio Connections", eds. Sjouwerman, L.O. & Dyer, K.K. (http://www.aoc.nrao.edu/events/xraydio). Version with full-resolution images at http://www.star.bris.ac.uk/~judec/jet_env.pdfAstrophysicstext