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   61143
   So far our group have promoted the observations of the radio loud high
   z QSO (RLQs). Thus we have found very exciting results in which the
   RLQs showed an evolutional effect of intrinsic absorption gas. Further
   results are published in Ap.J. (Cappi, Matsuoka et al 1997). Now we
   extend our interest to radio quiet high z QSO (RQQs). Why do the bright
   RQQs exist without radio emission? What is the relation between type 2
   QSO and RQQs? We need a lot of the radio quiet high z (z=2-3) QSO
   without bright radio loud for a component of CXB. So far we have only
   several RQQs, but some episode of iron line feature, and no strong
   absorption. We have to promote a long-term systematic observation of
   RQQs. The present project is a key for evolution of AGN as well as CXB
   problem.
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