A GOOD MASS PROXY FOR GALAXY CLUSTERS WITH XMM-NEWTON
A GOOD MASS PROXY FOR GALAXY CLUSTERS WITH XMM-NEWTON
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DOI：
10.1088/0004-637x/778/2/124
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
Hai-Hui Zhao;S. Jia;Yong-jun Chen;Chengkui Li;Liming Song;F. Xie
中科院分区：
文献类型：
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作者：
Hai-Hui Zhao;S. Jia;Yong-jun Chen;Chengkui Li;Liming Song;F. Xie
我们利用XMM-牛顿观测到的39个红移z < 0.1的星系团样本，研究了X射线观测值与总质量之间的关系。根据中心冷却时间和中心温降，将样品中的团簇分为两组：25个冷芯团簇和14个非冷芯团簇。我们研究了Lbol-M500、M500-T、M500-Mg和M500-YX的标度关系，以及冷核对这些关系的影响。结果表明，M500-YX关系的斜率接近标准自相似值，离散度最小，不随聚类样本而变化。此外，M500-YX关系不受冷芯的影响。因此，YX的参数可能是最好的质量指标。
We use a sample of 39 galaxy clusters at redshift z < 0.1 observed by XMM-Newton to investigate the relations between X-ray observables and total mass. Based on central cooling time and central temperature drop, the clusters in this sample are divided into two groups: 25 cool core clusters and 14 non-cool core clusters, respectively. We study the scaling relations of Lbol–M500, M500–T, M500–Mg, and M500–YX, and also the influences of cool core on these relations. The results show that the M500–YX relation has a slope close to the standard self-similar value, has the smallest scatter and does not vary with the cluster sample. Moreover, the M500–YX relation is not affected by the cool core. Thus, the parameter of YX may be the best mass indicator.