Observations of the 57Fe+23 Hyperfine Transition in Clusters

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We 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 1997

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