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   73020
   Soft X-ray excess emission from AGN is thought to be the hard or high
   energy tail end of the Big Blue Bump in the UV; the direct thermal
   emission from the accretion disk of the central super-massive black
   hole. More recent evidence has shown that the emission temperature of
   the soft X-ray excess is too high to originate directly from the disk
   and that more complex models involving Comptonisation of disk photons
   by a hot accretion disk corona could produce the observed properties of
   the soft excess. We propose ASCA observations of luminous quasars with
   known strong soft excess emission to test the properties of the soft
   excess.
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