SIMBAD references

2009ApJ...698..317A - Astrophys. J., 698, 317-323 (2009/June-2)

Redshift evolution in the iron abundance of the intracluster medium.


Abstract (from CDS):

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 ~ 1, over which we find a least-squares best-fit line Z(z)/Z= (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.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - X-rays: galaxies: clusters

Simbad objects: 29

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