2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11185We present a search for the hyperfine transition of the 57Fe+23 ion at 3.071 mm in clusters of galaxies with the ATNF Mopra telescope. The results are compared with a realistic estimate of the peak brightness temperature of the line in a cooling flow cluster A85, using the available X-ray data.5 pages, 2 Postscript figures, to appear in Astronomy and Astrophysics 1997Astrophysicstext