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   51175
   ASCA observations of many Seyfert I's confirm the warm absorbers with
   ionized oxygen(OVII & OVIII) edges. They are ionized by the intense
   continuum X-rays from the nucleus. The distance from the central source
   is estimated to be about 10**17 cm based on its time variability. Such
   distance is similar to those of the BLR clouds, which are also derived
   from the reverberation of different optical broad lines. The density is
   higher in BLR, while the temperature is higher in the warm absorber,
   then the pressure is close to each other. We would like to examine the
   relationship of the warm absorbers and BLR clouds by comparing their
   variability in X-rays and optical line emission. Once this proposal is
   accepted, optical observatories will be organized to perform the
   coordinate observations.
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