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   PR # 12109
    We propose to obtain ASTRO-D observations of three bright X-ray clust
    ers: A85 & A2029 which show X-ray signatures of cooling gas in their
    central regions, and A3667 with no evidence for cooling gas. We will
    obtain a high-quality spectrum of each cluster core with the SIS,meas
    ure the cooling-flow mass deposition rate directly from emission from
    gas cooling through ~1 keV,place constraints on low energy absorption
    from accumulated cold gas, and obtain a tight upper limiton any low
    temperature emission from the apparently non-cooling cluster. Spatial
    ly resolved spectroscopy with the SIS & GIS outside the cluster core,
    combined with higher spatial resolution data from ROSAT to determine
    the gas density, will determine the iron mass, the gas mass, as well
   as the total mass in the clust
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