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   71149
   We propose to observe the nearby group of galaxy NGC5044 group, to
   perform hard X-ray deep imaging of non-thermal hard X-ray. This non-
   thermal X-ray implies very important issues: particle acceleration and
   non-thermal pressure in clusters. The emission mechanism is thought to
   be inverse Compton scattering of CMB by relastivitic electrons or non-
   thermal bremsstrahlung between hot plasma and sub-relativistic
   particles. The distribution and spectral change of non-thermal hard X-
   ray is expected to constrain the emission mechanism.
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