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   81651
   SCA observations of starburst galaxies show their spectra comprise a
   low temperature thermal plasma component produced by the successive
   supernova and a hard component. The spectrum of the hard component is
   fitted with a thermal bremss. or a power law, but its origin is still
   mystery. We found time variability from the hard component in the most
   famous starburst galaxy M82. This result indicates the existence of the
   massive BH. Thus, we set up a hypothesis that the origin of the hard
   component of the other starburst galaxies is massive BHs, too.
   Therefore, we try to detect time variabilities from selected
   brightstarburst galaxies in order to inspect the hypothesis.
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