2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4040RBS797 and CL 0939+4713 are two intermediate red-shift clusters ($z=0.35-0.41$). They have very different morphologies but both show surprisingly interesting structures. RBS797 looks relaxed, with an almost circular morphology; a CHANDRA observation of this cluster has revealed two deep depressions in the X-ray emission near the core. CL 0939+4713 has instead an irregular morphology with evident substructures which seem to be in the process of merging.6 pages; Proccedings of the Symposium "New Visions of the X-ray Universe in the XMM-Newton and Chandra era", Noordwijk, November 2001Astrophysicstext