Temperature and Heavy-Element Abundance Profiles of Cool Clusters of Galaxies from ASCA
Temperature and Heavy-Element Abundance Profiles of Cool Clusters of Galaxies from ASCA
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ASCA 冷星系团的温度和重元素丰度剖面
DOI：
10.1086/321457
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Humboldt Fellow
中科院分区：
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作者：
A. Finoguenov;Arnaud;And L P David;Alexander Von;Humboldt Fellow
我们进行了空间分辨的X射线光谱研究的一组18个放松星系团的气体温度低于4千电子伏。光谱分析是使用ASCA/SIS数据加上ROSAT/PSPC和Einstein/IPC观测中所含的空间信息进行的。我们使用单温度拟合推导出温度分布，并校正了团簇中心冷气体的存在。对于样品中的所有簇，我们推导出Si和Fe的丰度分布。对于少数的集群，我们也得到Ne和S丰度配置文件。我们提出了一个比较的元素丰度在类似的超密度，以及元素的质轻比。我们的结论是，低熵，低丰度气体的优先吸积成集团和冷集群的潜力可以解释大多数观察到的金属丰度的趋势。此外，我们讨论了能量输入的重要性，从II型超新星的集群标度关系和观察到的分散在保留Ia型超新星产品之间的关系与集群形成的时代之间的差异。
We perform a spatially resolved X-ray spectroscopic study of a set of 18 relaxed clusters of galaxies with gas temperatures below 4 keV. Spectral analysis was done using ASCA/SIS data coupled with the spatial information contained in ROSAT/PSPC and Einstein/IPC observations. We derive the temperature profiles using single-temperature fits and also correct for the presence of cold gas at the cluster centers. For all of the clusters in the sample, we derive Si and Fe abundance profiles. For a few of the clusters, we also derive Ne and S abundance profiles. We present a comparison of the elemental abundances derived at similar overdensities as well as element mass-to-light ratios. We conclude that the preferential accretion of low-entropy, low-abundance gas into the potentials of groups and cold clusters can explain most of the observed trends in metallicity. In addition, we discuss the importance of energy input from Type II supernovae on cluster scaling relations and on the relation between the observed scatter in the retainment of Type Ia supernova products with differences between the epoch of cluster formation.
K.Kikuchi：“ASCA 测量三个簇中的金属丰度和温度分布：A4059、MKW 3s 和 2A 0335 096”Publ.Astr.Soc.Japan。
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