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   63035
   About 10-15 percent of optically-selected QSOs are BAL (broad
   absorption line) QSOs, showing deep absorption lines of low/high
   ionization levels of CIV, Si IV, N V, OIV, Mg II and Al III in their
   optical-UV spectra with poorly known physical conditions. They are
   known to be X-ray faint in the softer surveys and this could be due to
   heavy absorption intrinsic to the BAL QSOs. We propose to observe three
   relatively bright BAL QSOs with ASCA as a part of our hard X-ray survey
   of this class of objects with optical-NIR photometries and spectra. We
   expect to derive the column densities of the intrinsic X-ray absorbing
   material and investigate the relationship with optical-NIR properties.
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