SUMMARY OF PROPOSAL 62162
THE UNIVERSITY OF CALIFORNIA, SAN DIEGO
9500 GILMAN DRIVE
LA JOLLA
CA USA 92093-0424
Tel: +1 (619) 534-3718 Fax: +1 (619) 534-2294
Medium: CD ROM
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS
TEMPERATURE AND IRON ABUNDANCE OF THE Z
ABSTRACT
We propose a continuing investigation of a newly discovered cluster at z=0.3, 1E0657-56, for which CCD imaging has revealed the presence of gravitational arcs. Rosat HRI imaging suggests that 1E0657-56 is a luminous merger of sub-clusters. A 20 ks Asca Cycle 4 observation resulted in a best-fit temperature of kT=17.5+/-2.5 keV, which makes 1E0657-56 a candidate for the hottest cluster known, and a challenge for cosmological models of galaxy cluster formation. The Fe abundance provides an important datum for the study of the evolution of the intracluster gas. We therefore request an additional 60 ks to measure Fe XXVI line emission in this cluster, and to define the 0.5-10 keV spectrum more accurately, which will also set strict limits on any contaminating hard X-ray flux.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| PHILIP BLANCO | CASS/UCSD | USA |
| LARRY DAVID | HARVARD/CFA | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)1E0657-56 | 2 | 104.6563 | -55.9464 | 60 ks | N | Y | P | 0.38500 | 1 |
TARGET 1
CLUSTER HAS A CORE RADIUS OF 1 ARCMIN