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Title:
Discovery of a Large-Scale Abundance Gradient in the Cluster of Galaxies AWM 7 with ASCA
Authors:
Ezawa, H.; Fukazawa, Y.; Makishima, K.; Ohashi, T.; Takahara, F.; Xu, H.; Yamasaki, N. Y.
Publication:
Astrophysical Journal Letters v.490, p.L33 (ApJL Homepage)
Publication Date:
11/1997
Origin:
APJ
ApJ Keywords:
GALAXIES: ABUNDANCES, GALAXIES: CLUSTERS: INDIVIDUAL ALPHANUMERIC: AWM 7, INTERGALACTIC MEDIUM
DOI:
10.1086/311004
Bibliographic Code:
1997ApJ...490L..33E

Abstract

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 <~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 ~ 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.
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