SUMMARY OF PROPOSAL 71181
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 KUNIEDA | NAGOYA UNIV. | JAPAN |
| YUZURU TAWARA | NAGOYA UNIV. | JAPAN |
| AKIHIRO FURUZAWA | NAGOYA UNIV. | JAPAN |
| FUMIE AKIMOTO | NAGOYA UNIV. | JAPAN |
| MANABU WATANABE | NAGOYA UNIV. | JAPAN |
| SHIGERU MIYOSHI | KYOTO SANGYO UNIV. | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)A3558 | B | 201.0996 | -26.8829 | 100 ks | N | Y | P | 1.95000 | 1 |