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Title:
ASCA Observation of the Poor Cluster of Galaxies AWM 7: Evidence of an Abundance Increase in the Intra-Cluster Medium at the Center
Authors:
Xu, Haiguang; Ezawa, Hajime; Fukazawa, Yasushi; Kikuchi, Ken'ichi; Makishima, Kazuo; Ohashi, Takaya; Tamura, Takayuki
Affiliation:
AA(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113 and Institute for Space Astrophysics, Department of Physics, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China), AB(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113), AC(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113), AD(Department of Physics, Faculty of Science, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-03), AE(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113), AF(Department of Physics, Faculty of Science, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-03), AG(Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113)
Publication:
Publ. of the Astronomical Society of Japan, v.49, p.9-16. (PASJ Homepage)
Publication Date:
02/1997
Origin:
PASJ
PASJ Keywords:
GALAXIES: ABUNDANCES, GALAXIES: CLUSTERING, GALAXIES: CLUSTERS: INDIVIDUAL (AWM 7), X-RAYS: GALAXIES
Bibliographic Code:
1997PASJ...49....9X

Abstract

We present the results of the ASCA central-pointing observation of the poor cD cluster AWM 7. The Performance Verification phase data of GIS 2, GIS 3, SIS 0 chip 1, and SIS 1 chip 3 were used to study the properties of the intra-cluster medium (ICM) within 16' around the X-ray centroid. We found that, compared with the outer regions, the equivalent width of the Fe-K lines increases in the central 4' ( ~ 123 h(-1_{50) kpc)} region by a factor of ~ 1.5. Although the ICM temperature tends to decrease in the same region, the observed increase in the Fe-K line equivalent width cannot be explained away by a possible temperature drop. The model fitting indicates that the abundance increases from ~ 0.4 solar outside 4' to ~ 0.6 solar at the center. Thus, after the Centaurus cluster and the Virgo cluster, AWM 7 is the third poor cD cluster confirmed to show an abundance increase in the central region. The 0.5--3 keV flux of the cool emission within 4' is constrained to be <8*E(42) h(-2}_{50) erg s(-1) , or <21% of the total 0.5--3 keV flux from the same spatial region. We discuss possible relations of these phenomena to the cD galaxy.

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