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   51134
   We propose to observe the giant outer lobe of Centaurus A. Of large
   area of Cen A outer lobes, we selected the edge region of the northern
   outer lobe, where ROSAT discovered the arc-shaped, rim-brightening X-
   ray excess. So, we want to determine the origins of this X-ray excess
   by analyzing the X-ray spectra. At the same time, it is also expected
   to detect the inverse-Compton X-rays scattering off the CMB photons
   from the outer lobe itself. By comparing the inverse-Compton X-ray flux
   and the synchrotron radio flux, we can determine the magnetic field
   strength in the outer lobe without any assumptions
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