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   72151
   We propose deep observations of 3 Broad Absorption Line (BAL) QSOs with
   previous X-ray detections. BALs are caused by outflows from the nucleus
   with velocities reaching 0.2c. While the X-ray diagnostics of this
   region would be powerful, BALQSOs have been essentially undetected in
   X-rays so far. Our proposed observations would determine accurate
   spectral shape and absorbing column density and will limit the partial
   covering required by current models. This would test the hypothesis
   that BALQSOs are normal radio-quiet quasars viewed along a line-of-
   sight through absorbing material. If instead BALQSOs are found to be
   intrinsically underluminous in X-rays, it would change the X-ray
   luminosity function of AGN and would alter photoionization modeling of
   BALQSOs themselves.
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