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   PR # 21083
    It is known that the galaxy interaction induce a starburst activity, 
    and X-ray emission is detected from the galaxy. Now we propose the   
    interacting galaxies prior starburst phase. It is thought that there 
    are no X-ray emission from the galaxies without starburst activity,  
    but from NGC6872 and NGC7320, the X-ray emission have been detected  
    with Einstein. We would like to reveal the emission mechanism.  One  
    possible explanation is that the hot gas is bound in the gravitationa
    l  potential vy the dark matter as well as early type galaxies.  If  
    true, it is very important for the cosmology.  Therefore we have to 
    check the origin of the X-ray emission.                             
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