Metal Abundances in the Cool-Cores of Galaxy Clusters - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: We use XMM-Newton data to carry out a detailed study of the Si, Fe and Niabundances in the cool cores of a representative sample of 26 local clusters.We have performed a careful evaluation of the systematic uncertainties relatedto the instruments, the plasma codes and the spectral modeling finding that themajor source of uncertainty is in the plasma codes. Our Si, Fe, Ni, Si-Fe andNi-Fe distributions feature only moderate spreads from 20% to 30% aroundtheir mean values strongly suggesting similar enrichment processes at work inall our cluster cores. Our sample averaged Si-Fe ratio is comparable to thosemeasured in samples of groups and high luminosity ellipticals implying that theenrichment process in ellipticals, dominant galaxies in groups and BCGs inclusters is quite similar. Although our Si-Fe and Ni-Fe abundance ratios arefairly well constrained, the large uncertainties in the supernovae yieldsprevent us from making a firm assessment of the relative contribution of typeIa and core-collapsed supernovae to the enrichment process. All that can reallybe said with some certainty is that both contribute to the enrichment ofcluster cores.



Author: S. De Grandi, S. Molendi

Source: https://arxiv.org/







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