2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/615The far-infrared emission from rich galaxy clusters is investigated. Maps have been obtained by ISO at 60, 100, 135, and 200 microns using the PHT-C camera. Ground based imaging and spectroscopy were also acquired. Here we present the results for the cooling flow cluster Sersic 159-03. An infrared source coincident with the dominant cD galaxy is found. Some off-center sources are also present, but without any obvious counterparts.6 pages, 4 postscript figures, accepted for publication in `Astronomy and Astrophysics'Astrophysicstext