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   PR # 11180
       We propose to observe 3 very luminous clusters of galaxies in the
    redshift range of 0.1 to 0.3 found by soft X-ray imaging (ROSAT and
    EINSTEIN). They all have luminous optical line nebulosities around
    the central galaxy and are expected to be massive cooling flows. Our
    ROSAT images confirm that they are strongly peaked. ASCA data will
    spectrally image the cooling flow from the rest of the cluster and
    enable us to determine the full X-ray properties of the flow (mass
    deposition rate, abundances, gravitational profile etc) and of the
    outer parts of the cluster. Comparison with lower redshift cooling
    flows will begin to show how cooling flows evolve.


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