SUMMARY OF PROPOSAL 41257
MR KIYOSHI HASHIMOTODANI
FACULTY OF SCIENCE, OSAKA UNIVERSITY
OSAKA JAPAN 560
TOYONAKA
1-1, MACHIKANEYAMA

  E-mail: HASIMTDN@ESS.SCI.OSAKA-U.AC.JP	Tel: 06-850-5475	Fax: 06-850-5539
  Medium: 2.5GB8MM

Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS                      
  Title: A SEACH FOR                                                                     


Abstract:
 We propose the observation of the unknown, new type of object called "failed clu
 ster" of galaxies. It is characterized to be a large cloud of hot gas with no vi
 sible galaxies. At first, the exsistence of this type of object was suggested by a
 survey of EINSTEIN/IPC field. From the initial screening of 1435 IPC field, a t last
 only ONE possible candidate was found. If the candidate is really the fai led
 cluster, that will constrain the cosmological models for the large scale str
 uctures. The existence of failed cluster will be a difficulty for so called "bot tom
 up model" of hierarchcal clustering. Our aim is to identify thecandidate as failed cluster by detailed spectroscopy with ASCA.

 Co-Is:
   1  KIYOSHI HAYASHIDA   	OSAKA UNIV.                   JAPAN     
      HAYASIDA@ESS.SCI.OSAKA-U.AC.JP	06-850-5476
   2  EMI MIYATA          	OSAKA UNIV.                   JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
0806+20                1  122.2717   20.4115    40   N   N   P  0.04000   1