SUMMARY OF PROPOSAL 71181

DR. KOUJUN YAMASHITA
YAMASITA@U.PHYS.NAGOYA-U.AC.JP

NAGOYA UNIVERSITY
FURO-CHO, CHIKUSA-KU
NAGOYA
AICHI-KEN JAPAN 464-8602
Tel: 81-52-789-3540 Fax: 81-52-789-2919
Medium: 4GBDAT
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS

DETERMINATION OF THE OPTICAL DEPTH OF FE-K LINES IN AN INTRACLUSTER MEDIUM


ABSTRACT

The optical depth of He-like Fe-Ka emission lines in an intracluster medium is derived from the intensity ratio of He-Like/H-like Ka, Ka/Kb and Fe-L/Fe-K, which is due to the resonance scattering effect. It results in increasing Fe abundance by a factor of two at most and becomes a key parameter to derive the Hubble constant. A3558(z=0.0482) is selected for this purpose under criteria of high intensity, temperature of 5-7keV, isothermality and large angular size fit well to GIS field of view. We need long exposure for detailed spectral analysis of Fe-K lines.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
HIDEYO KUNIEDANAGOYA UNIV.JAPAN
YUZURU TAWARANAGOYA UNIV.JAPAN
AKIHIRO FURUZAWANAGOYA UNIV.JAPAN
FUMIE AKIMOTONAGOYA UNIV.JAPAN
MANABU WATANABENAGOYA UNIV.JAPAN
SHIGERU MIYOSHIKYOTO SANGYO UNIV.JAPAN

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)A3558
B
201.0996-26.8829
100 ks
N
Y
P
1.95000
1