SUMMARY OF PROPOSAL 41116
MR HIDENORI WATARAI
NAGOYA UNIVERSITY
AICHI JAPAN 464-01
NAGOYA
FURO-CHO, CHIKUSA-KU

  E-mail: WATARAI@TOYO.PHYS.NAGOYA-U.AC.JP	Tel: 81-52-789-2560	Fax: 81-52-789-2919
  Medium: 4GBDAT

Subject: NORMAL GALAXIES                                             
  Title: X-RAY STUDY OF ULTRALUMINOUS IRAS GALAXIES, UGC05101 & IRAS 08572+3915, AND TESTING THE EVOLUTIONARY SCENARIO


Abstract:
 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.

 Co-Is:
   1  YUICHI TERASHIMA    	NAGOYA UNIVERSITY             JAPAN     
      (No Co-I contact data)
   2  YUZURU TAWARA       	NAGOYA UNIVERSITY             JAPAN     
   3  TAKAO NAKAGAWA      	ISAS                          JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
UGC05101               2  143.9654   61.3531    40   N   Y   P  0.09000   1