Implications of the central metal abundance peak in cooling core clusters of galaxies
Implications of the central metal abundance peak in cooling core clusters of galaxies
复制标题
DOI：
10.1051/0004-6361:20040047
复制
发表时间：
2004-02
影响因子：
6.5
通讯作者：
H. Böhringer;K. Matsushita;E. Churazov;A. Finoguenov;Y. Ikebe
中科院分区：
文献类型：
--
作者：
H. Böhringer;K. Matsushita;E. Churazov;A. Finoguenov;Y. Ikebe
xmm -牛顿最近对星系团的观测提供了重元素分布的详细信息，这些重元素分布在具有冷却核心的星系团的中心区域，提供了强有力的证据，证明这些金属大多数来自最近的Ia型SN。本文编制了最重要的金属丰度示踪剂铁的累积质量剖面资料。我们发现长富集时间（≥5 Gyr）是产生中心丰度峰的必要条件。经典的冷却流、强对流的星系团内介质以及星系团合并引起的完全金属混合会过快地破坏观测到的丰度峰。因此，观测结果对星团演化模型设置了强烈的约束，要求星团中的冷却核心在很长时间内保持不变。我们进一步从观测中得出结论，星系团内介质的最内层很可能主要由cD星系的恒星质量损失所产生的气体所主导。
Recent XMM-Newton observations of clusters of galaxies have provided detailed information on the distribution of heavy elements in the central regions of clusters with cooling cores providing strong evidence that most of these metals come from recent SN type Ia. In this paper we compile information on the cumulative mass profiles of iron, the most important metallicity tracer. We find that long enrichment times (≥5 Gyr) are necessary to produce the central abundance peaks. Classical cooling flows, a strongly convective intracluster medium, and a complete metal mixing by cluster mergers would destroy the observed abundance peaks too rapidly. Thus the observations set strong constraints on cluster evolution models requiring that the cooling cores in clusters are preserved over very long times. We further conclude from the observations that the innermost part of the intracluster medium is most probably dominated by gas originating predominantly from stellar mass loss of the cD galaxy.