SUMMARY OF PROPOSAL 42192
PROFESSOR JOSEPH PATRICK HENRY
UNIVERSITY OF HAWAII
HI USA 96822
HONOLULU
SPALDING 253, 2540 MAILE WAY

  E-mail: HENRY@GALILEO.IFA.HAWAII.EDU	Tel: 808-956-7598	Fax: 808-956-9590
  Medium: 2GB8MM

Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS                      
  Title: X-RAY SPECTRUM OF AN EXTREMELY DISTANT GALAXY CLUSTER                           


Abstract:
 We propose to measure the spectrum of a newly discovered galaxy cluster at a
 redshift of 0.818. This cluster was found as part of our ongoing identification work
 of X-ray sources near the North Ecliptic Pole in the ROSAT All-Sky Survey. There is
 only one other X-ray selected cluster known with a redshift greater than 0.8. An
 ASCA spectrum has previously been obtained for it. Our proposed observation combined
 with the existing data provide the first glimpses into the X-ray properites of
 clusters at these very early epochs. The very existence of massive clusters at these
 redshifts is problematic for some theories of the origin of structure in the Universe.

 Co-Is:
   1  ISABELLA GIOIA      	INST. FOR ASTRONOMY           USA       
      GIOIA@GALILEO.IFA.HAWAII.EDU	808-956-9845
   2  ULRICH BRIEL        	MAX PLANCK, GARCHING          GERMANY   


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
RX J1716.6+6708        0  259.2000   67.1431    100   N   Y   P  0.00740   1