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   PR # 12200
    NRAO140 is a flat radio spectrum quasar at a redshift of z=1.258, and
    one of the most luminous known with a 2-10 keV luminosity of $\sim 10
    ^{47}$ erg/s. Previous X-ray observations of this source have shown
    variations in the X-ray absorbing column on timescales down to 5
    months. ASCA observations will provide a high quality investigation
    of extreme conditions in the vicinity of this AGN.We propose to study
    the ionization state and variability of the line-of-sight absorber,
    and conduct a sensitive search for the signatures of Compton reflect-
    ion.These investigations will provide a testof whether the huge X-ray
    luminosity in this source is a consequence of beaming, or an ultra
    massive central black hole.

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