******************************************************
   PR # 41116
   We propose ASCA observations of two Ultra-luminous infrared
   galaxies(ULIRGs), UGC05101 and IRAS 08572+3915. The dominant energy
   source of ULIRGs has been discussed by many authers, but enormous
   dust and molecular gas prevent to obtain the true nature of central
   engine of ULIRGs. On the contrary, recent ASCA observations reveal
   that "Hidden AGN" is certainly existence in some ULIRGs showed no(or
   little) evidence of AGN in other wavelength region. Thus the Hard
   X-ray observation by ASCA is most useful(or only) mean to reserch the
   central region of ULIRGs. Our target appear to be different phase
   within the evolutionary scenario of ULIRGs proposed by Sanders et
   al.(1988), compare with already observed ULIRGs by ASCA. So, this
   observation will also verify the scenario.
  ******************************************************