SUMMARY OF PROPOSAL 52177

DR. MEGAN ELIZABETH DONAHUE
DONAHUE@STSCI.EDU

SPACE TELESCOPE SCIENCE INSTITUTE
3700 SAN MARTIN DRIVE
BALTIMORE
MD USA 21218
Tel: 410 338 4701 Fax: 410 338 4717
Medium: 2GB8MM
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS

AN X-RAY LUMINOUS, DISTANT (Z


ABSTRACT

We are proposing to complete our program to measure the X-ray temperatures (Tx) of X-ray luminous, distant (z>0.5) clusters of galaxies. The final cluster in our sample, MS1137+66 (z=0.78), is just as luminous but optically much poorer than the other 3 clusters. The distant clusters observed thus far in our sample are hotter than standard structure formation models predict. Cluster temperatures at high redshift constrain predictions of Lx-Tx evolution. Because MS1137+66 is chosen from a well-defined X-ray selected sample, its Tx also constrains the z=0.8 cluster temperature function. It is bright and compact enough for 1-CCD SIS observations; the temperature break is redshifted to ~3-5 keV. HST WFPC2 and ROSAT HRI images are scheduled for MS1137+66.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
JOHN STOCKEUNIV. OF COLORADOUSA
ISABELLA GIOIAIFA, HAWAIIUSA
GERRY LUPPINOIFA, HAWAIIUSA

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)MS1137.5+6625
1
175.0992 66.1386 80 ksN
N
P
0.01600
1