SUMMARY OF PROPOSAL 51229
NAGOYA UNIVERSITY
AICHI JAPAN 464-01
NAGOYA
CHIKUSA-KU
Tel: 052-789-2917 Fax: 052-789-2919
Medium: 4GBDAT
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS
STUDY OF THE FE LINE INTENSITY ANOMALY IN A665
ABSTRACT
The line emission in the X-ray spectrum of clusters of galaxies are useful tool to study physical condition of plasma. For distant clusters, Fe-K lines are shifted below 7keV and observed with better efficiency. For A665, from detailed line analysis, it was found that the ratio of K alpha to K beta seemed to be smaller than the model prediction. The metal abundance derived from Fe-K beta is 3 times larger than that derived from K alpha. This anomaly seems to be seen in the outer region of cluster, though it is marginal because of statistical error. This phenomena has been seen in the some clusters. We propose the re-observation of A665 and make sense of anomaly with good statistics. This lead the test of the collisional ionization equilibrium assumption of ICM.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| MANABU WATANABE | NAGOYA UNIVERSITY | JAPAN |
| FUMIE AKIMOTO | NAGOYA UNIVERSITY | JAPAN |
| YUZURU TAWARA | NAGOYA UNIVERSITY | JAPAN |
| KOUJUN YAMASHITA | NAGOYA UNIVERSITY | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)A665 | 2 | 127.6875 | 65.8817 | 80 ks | N | Y | P | 0.15000 | 1 |