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   61193
   Heavy elements in the hot intracluster medium (ICM) of distant clusters
   are an important tool to study cosmological evolution as well as the
   early phase of the member galaxies, since these heavy elements maintain
   the history of the metal enrichment processes. We observed earlier the
   distant (redshift $z$=0.402) cluster A851 and obtained an iron
   abundance upper limit of $\\sim$0.2 solar, substantially lower than
   that for more recent clusters. However, the statistical uncertainty is
   still too large to conclude the low abundance. Because of the scarcity
   and crucial importance of the data of such high-redshifted clusters, we
   propose an additional observation of this cluster.
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