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   PR # 11179
      We propose to observe a sample of clusters containing the most
    massive cooling flows within redshift 0.1.  ASCA observations will
    resolve the cooling flow and enable us to measure the spectrum of the
    cooling gas, determine metallicities,unambiguosly measure any excess
    absorption present in the cluster core and examine the gravitational
    work done on the gas as it cools. Spectra from the outer regions of
    the cluster will measure the gas temperature and permit a determina-
    tion of the total gravitational masses out to 3 Mpc.




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