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    PR # 31271                                                                   
      Distant powerful radio galaxies with redshift of around 0.5 shows sg       
     inificant cosmological evolution. From the galaxy counting around the       
      radio galaxies, it is showed that the powerful radio galaxies prefer       
     entially reside in the rich cluster envirement.  We would search ther       
     mal emission from hot IGM around the radio galaxies of 3C215 and 3C33       
     0 in which concentration of galaxies around the source are observed.        
     Detection of thermal emission prove the existence of rich cluster env       
     ironment there. Otherwise, if not for such thermal emission, hot gas        
     has not yet created at that epoch (z=0.5), though there might be clus       
     tering of galaxies as observed.                                             
                                                                                 
                                                                                 
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