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   81717
   The radio-quiet quasar PDS456 is the most luminous object in the local
   (z<0.3) Universe, more luminous than the well known radio-loud quasar
   3C 273. We plan to follow up our earlier X-ray observations (with ASCA
   and RXTE) of PDS456, which showed a complex X-ray spectrum, with strong
   iron K shell features and rapid variability of the X-ray continuum. In
   fact the continuum flux doubled in only 17 ksec, implying emission from
   within just 2 Schwarzschild radii of the putative massive black hole.
   Therefore the aims of this ASCA proposal are to study the fast X-ray
   variability and the iron K shell line profile in PDS 456, which could
   provide the clearest evidence yet to support the accretion disk
   paradigm in Active Galactic Nuclei.
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