An XMM-Newton Spatially-Resolved Study of Metal Abundance Evolution in Distant Galaxy Clusters
Abstract
We present an XMM-Newton study of 39 distant clusters of galaxies (0.4 < z <1.4) performing a spatially resolved X-ray spectral analysis. We did not observe a statistically significant abundance evolution with redshift. The most significant deviation from no evolution (at a 90% c.l.) is observed considering the emission from the whole cluster (r < 0.6 R500), that could be parametrized as Z Z0*(1+z)-0.8±0.5.
Dividing the emission in three radial bins, no significant evidence of abundance evolution could be observed fitting the data with a power-law. A substantial agreement with measures presented in previous works is found. Computing error-weighted mean of the spatially resolved abundances in three redshift bins, we found it consistent to be constant with the redshift. Although the large error bars in the measure of the weighted-mean abundance prevented us from claiming any statistically significant spatially resolved evolution, the trend with z in the 0.15-0.4 R500 radial bin complements nicely the measures of Maughan et al. (2008), and broadly agrees with theoretical predictions. We also found that the data points derived from the spatially resolved analysis are well fitted by a function of both radius and redshift Z=f(r,z), which shows a significant negative trend of Z with the radius and no significant evolution with the redshift. The present study is the first attempt made to spatially resolve the evolution of abundance with redshift. However, the sample size and the low statistics associated with most of the clusters in the sample prevents us to draw any statistically significant conclusion on the different evolutionary path that the different regions of the clusters may have traversed.- Publication:
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American Astronomical Society Meeting Abstracts #219
- Pub Date:
- January 2012
- Bibcode:
- 2012AAS...21920705B