期刊
ASTROPHYSICAL JOURNAL
卷 698, 期 1, 页码 317-323出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/698/1/317
关键词
galaxies: clusters: general; X-rays: galaxies: clusters
资金
- ESA
- NASA
Clusters of galaxies provide a closed box within which one can determine the chemical evolution of the gaseous baryons with cosmic time. We studied this metallicity evolution in the hot X-ray emitting baryons through an analysis of XMM-Newton observations of 29 galaxy clusters in the redshift range, 0.3 < z < 1.3. Taken alone, this data set does not show evidence for significant evolution. However, when we also include a comparable sample of 115 clusters observed with Chandra and a lower redshift sample of 70 clusters observed with XMM at z < 0.3, there is definitive evidence for a decrease in the metallicity. This decrease is approximately a factor of two from z = 0 to z approximate to 1, over which we find a least-squares best-fit line Z(z)/Z(circle dot) = (0.46 +/- 0.05) - (0.38 +/- 0.03) z. The greatest uncertainty in the evolution comes from poorly constrained metallicities in the highest redshift bin.
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