Discovery of a large-scale abundance gradient in the cluster of galaxies AWM 7 with ASCA

被引：67

作者：

Ezawa, H

Fukazawa, Y

Makishima, K

Ohashi, T

Takahara, F

Xu, H

Yamasaki, NY

机构：

[1] UNIV TOKYO,RES CTR EARLY UNIVERSE,BUNKYO KU,TOKYO,JAPAN

[2] TOKYO METROPOLITAN UNIV,DEPT PHYS,HACHIOJI,TOKYO 19203,JAPAN

[3] SHANGHAI JIAO TONG UNIV,INST SPACE & ASTROPHYS,DEPT PHYS,SHANGHAI 200030,PEOPLES R CHINA

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 490卷 / 01期

关键词：

galaxies; abundance; clusters; individual; (AWM; 7); intergalactic medium; X-rays;

D O I：

10.1086/311004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A large-scale gradient in the metal abundance has been detected with ASCA from an X-ray bright cluster of galaxies, AWM 7. The metal abundance shows a peak of 0.5 solar at the center and smoothly declines to less than or similar to 0.2 solar at a radius of 500 kpc. The gas temperature is found to be constant at 3.8 keV. The radial distribution of iron can be fitted with a beta model with beta similar to 0.8 assuming the same core radius (115 kpc) as that of the intracluster medium. The metal distribution in AWM 7 suggests that the gas injected from galaxies is not efficiently mixed in the cluster space and traces the distribution of galaxies.

引用

页码：L33 / L36

页数：4

共 29 条

[21] SOFT-X-RAY SPECTRUM OF A HOT PLASMA [J].