*************************************************************************
   61163
   We propose to obtain ASCA X-ray spectra of three Ultraluminous Infrared
   Galaxies (ULIRGs). For one source, IRAS 20210+1121, we detected a
   strong 6.4-keV line, with equivalent width about 1 keV, in the SAX
   spectrum. The other two sources, PKS 1345+1121 and IRAS 23498+2423,
   have near IR spectra which show the presence of broad Paschen alpha,
   providing clear evidence for a hidden quasar. Our question is, are the
   hard X-ray properties of ULIRGs as a class, different from other
   Seyfert 1s and quasars? A combined approach using existing optical and
   infrared data, together with the proposed ASCA X-ray observations, will
   answer this question.
 *************************************************************************