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   72157
   By observing the bright radio-quiet z=1.25 quasar Q0140-3938 we propose
   to test the X-ray `Baldwin effect': that the relativistically broadened
   Fe-K line becomes weaker as AGN become more luminous. This needs to be
   done with radio-quiet quasars to avoid beaming dilution. We will also
   test the proposed explanation of this effect: that the accretion disk
   becomes fully ionized. This can be done by measuring the Compton hump
   relative to the Fe-K line, since Compton scattering operates
   independent of ionization. To measure the Compton hump with ASCA
   requires z>1. Q0140-3938 is the only radio-quiet quasar with a high
   enough ASCA count rate to give strong limits (EW<30eV; Omega/2pi<0.2).
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