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    PR # 31266                                                                   
      We propose to observe an X-ray emission from a supercluster containi       
     ng A2028/A2029. Preivious X-ray studies on superclusters have been ma       
     ilny intended to detect uniform X-ray emission embeded in  intra-supe       
     rcluster space, and got negative results. We thus would focus on the        
     problem of how far the clusters' X-ray emission extends in a super-cl       
     uster space. Our estimation is that we can constraign X-ray surface b       
     rightness of cluster emission (if it exists) up to 5 Mpc from a clust       
     er center. If extent of the cluster is larger than we expected (or in       
     ter-cluster gas does exist), it will give impacts on cosmological iss       
     ues, including recently discussed 'barion over-density'.                    
                                                                                 
                                                                                 
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