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   PR # 21144
     We propose to secure accurate X-ray temperatures using ASCA for a   
    luminous  example of moderate redshift clusters which are the subject
    of an intense  campaign with ground-based telescopes and the ROSAT   
    High Resolution Imager. By examining the spatial distribution of star
    -forming galaxies in a well-studied intermediate redshift cluster    
    (identified via spectroscopy) and  X-ray image from ROSAT's HRI, we  
    propose to identify substructures and compare ASCA  temperature and  
    iron line distribution to test the hypothesis that the  hierarchical 
    growth of structures over 0$<z<$0.5 was directly responsible for  the
    quenching of star formation in dense environments and the enrichment 
    of the intracluster gas.                                            
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