*************************************************************************
   62135
   We propose a deep ASCA observation of one representative broad
   absorption line (BAL) QSO. PG0946+301 has been chosen as the best
   target for our large collaborative campaign. Deep ASCA spectroscopy
   will provide the first high quality measurements of the ionizing
   continuum and total column density of the warm absorbers in BALQSOs.
   Photoionization modeling of this spectrum, combined with existing HST
   and ground-based optical spectra, will enable us to characterize the
   dynamics, ionization, and metallicity of the outflows. Results for this
   typical BALQSO are immediately generalizeable to BALQSOs as a class.
   Since BALQSOs are probably normal QSOs viewed along a sightline passing
   through a BAL outflow, we expect to provide a unique probe of
   conditions near the nucleus of most QSOs.
 *************************************************************************