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   51147
   We propose to observe the high redshift quasar PKS1937-101(z=3.8). The
   ROSAT observation showed the X-ray spectrum of this quasar is very
   hard. ROSAT could not determine whether this hardness is due to an
   intrinsic flatness or a strong absorption in lower energies, but ASCA
   can place strong constraints. It is important to understand the origin
   of the hard spectrum because it must place constraints on the nature of
   the X-ray emission and the physical environment of AGN in the early
   universe. It may also give clue to the AGN evolution and the Cosmic X-
   ray Background.
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