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   PR # 41129
   We propose to observe the high redshift quasar Q0636+680(z=3.2). This
   quasar has the hardest xray spectrum among the high redshift quasars
   observed with ROSAT. This was interpreted as being possibly due to
   excess absorption. ROSAT could not constrain the absorber and the
   continuum form, but ASCA observation can do so significantly. It is
   important to understand the origin of the hard spectrum because it
   must impose constrains on the nature of the xray emission and the
   physical environment. It may also give clue to the AGN evolution and
   the cosmic xray background.
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