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   51267
   In the ASCA Large Sky Survey(LSS),we detected about 70 sources, some of
   which have extremely hard spectrum. This result indicates a possibility
   to solve the 'spectral paradox',which has puzzuled astrophysicists for
   more than 30 years. We propose to observe LSS1983+310 , one of the
   hardest sources detected in LSS(GIS photon index 0.9). Preliminary
   optical identification shows that spectrum of the candidate seems to
   have peculiar line profiles, indicating this could be a 'rare' kind of
   object. We will also observe it with ROSAT HRI this year. The deep
   observation of this source with ASCA gives us a new sight to understand
   the origin of the Cosmic Xray Background.
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