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   PR # 41065
   We propose to carry out a deep-pointing observation of the Galactic
   Plane, (l,b) = (28,0). The aim of this observation is to estimate the
   spatial brightness fluctuation of the galactic ridge X-ray emission
   (namely, GRXE). What is the origin of the GRXE? Is that of truly
   diffuse origin? or of discrete origin? Here, we want to reject the
   possibility that the GRXE is simply gathering of faint X-ray point
   sources. Judging from the results of past observations, the
   fluctuation of the GRXE seemed to be so small that interpretation of
   the GRXE as faint sources may be difficult. But statistics of the
   data was so poor. By this deep observation, we will surely come to a
   conclusion that the GRXE is the emission from truly diffuse galactic
   plasmas.
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