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    PR # 31119                                                                   
     Why activities of nuclei of normal galaxies and active galaxies are s       
     o different?  The key to answer this question, we consider, is in LIN       
     ER nuclei of spiral galaxies.  About 85 % of Sa and Sb galaxies, and        
     about 30% of Sc galaxies contain a LINER nucleus.  The study of optic       
     al line emission suggests that a photon source of a flat non-thermal        
     spectrum lies at the center, though no activities have been reported        
     in other wavelengths. If LINER is a kind of low-luminosity AGN like S       
     eyfert II, some activity is expected to be observed in X-ray waveleng       
     ths, in particular, in the energy band above 2 keV, where ASCA is the       
      most powerful instrument so far.  We propose to observe LINER's of s       
     everal different levels of activities in order to clarify the X-ray a       
    ctivity of these galactic nucl                                               
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