SUMMARY OF PROPOSAL 61182

DR. KYOKO MATSUSHITA
MATUSITA@PHYS.METRO-U.AC.JP

TOKYO METROPOLITAN UNIVERSITY
TOKYO JAPAN 192-03
HACHIOJI
1-1 MINAMI-OHSAWA
Tel: +81-426-77-2492 Fax: +81-426-77-2483
Medium: 4GBDAT
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS

ELLIPTICAL DOMINANT GROUP OF GALAXIES


ABSTRACT

Since the volume number density of member galaxies is quite high in galaxy groups, every galaxies would be merged into a giant elliptical galaxy in a few Gyr. This was theoretically pointed out by Barns. In order to chech this evolution scenario, we propose to observe an X-ray selected galaxy group RXJ0454.8-1806, which is one of the X-ray brightest group of galaxies discovered in the ROSAT All Sly Survey and optical follow up observations. This system is dominated by a giant elliptical galaxy and may be an evolved system. Since it is as bright as HCG62 which is the brightest galaxy group observed with ASCA so far, ASCA data will surely allow us to measure the gas mass, total gravitating mass, amount of heavy elements and their spatial distributions with very good accuracy.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
TAKAYA OHASHITOKYO METRO-UJAPAN
YASUSHI IKEBEMPEGERMANY
HANS BOERINGERMPEGERMANY

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)RXJ0454.8-1806
2
73.6921-18.0960 40 ksN
Y
P
0.16000
1