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    PR # 31262                                                                   
      Though X-ray observations have revealed the presence of a lot of  ho       
     t gas in the clusters of galaxies, its formation and evolution  are n       
     ot observed yet. We found a cluster most of whose member are  starbus       
     t or post-starburst galaxies. We think that this cluster,  Zwicky 161       
     5.8+3505, is now in the stage of growing up of hot gas,  because of t       
     he presence of many starburst galaxies and irregular  X-ray hot gas d       
     istribution not tracing the galaxy distribution.  It is necessary to        
     observe the distribution and state of hot gas  in the cluster in deta       
     il to discuss the growth of the hot gas and  ICM-galaxy interaction w       
     hich is considered to be a trigger of the  simultaneous starburst.          
                                                                                 
                                                                                 
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