SUMMARY OF PROPOSAL 41278
DR. KAZUYA WATANABE
NIIGATA UNIVERSITY
NIIGATA JAPAN 950-21

8050 IGARASHI-2

  E-mail: KAZUYA@ASTRO.SC.NIIGATA-U.AC.JP	Tel: 025-262-6162	Fax: 025-262-6165
  Medium: 2.5GB8MM

Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS                      
  Title: DARK GRAVITATIONAL LENS SEARCH BY X-RAY TELESCOPE                               


Abstract:
 Gravitational-lensing objects for roughly half of about 30 gravitationally lensed
 QSO samples have already been confirmed by optical observations. However, lens
 objects for the other half samples have not yet been found despite of optical deep
 searches for them. These are called "dark lenses". We are planning to search for
 lens objects by X-ray detection of hot gases associated with deep gravitational
 potentials of dark lens objects. Encouraged by the first successful result, MG2016
 (ASCA AO2), we propose X-ray search for the dark lens of the most misterious dark lens candidate Q2345+007.

 Co-Is:
   1  MAKOTO HATTORI      	MPE GARCHING                  GERMANY   
      (No Co-I contact data)
   2  IKUKO ASAOKA        	MPE                           GERMANY   
   3  YASUSHI IKEBE       	RIKEN                         JAPAN     
   4  TAKESHI TSURU       	KYOTO UNIV.                   JAPAN     
   5  HANS B\"OHRINGER    	MPE GARCHING                  GERMANY   
   6  TOSHIAKI TAKESHIMA  	NASA GSFC                     USA       
   7  T. MIHARA           	RIKEN                         JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
Q2345+007              2  357.0813    0.9557    80   N   Y   P  0.00400   1