Abundance constraints and direct redshift measurement of the diffuse x-ray emission from a distant cluster of galaxies

Yasuhiro Hashimoto, X. Barcons, H. Böhringer, A. C. Fabian, G. Hasinger, V. Mainieri, H. Brunner

    研究成果: 雜誌貢獻期刊論文同行評審

    29 引文 斯高帕斯(Scopus)

    摘要

    We report on the XMM-Newton (XMM) observation of RX J1053.7+5735, one of the most distant X-ray selected clusters of galaxies, which also shows an unusual double-lobed X-ray morphology, indicative of a possible equal-mass cluster merger. The cluster was discovered during the ROSAT deep pointings in the direction of the Lockman Hole. All XMM Lockman Hole observations (PV, AO-1 & AO-2 phases) with the European Photon Imaging Camera (EPIC) were combined for the analysis, totaling exposure times ∼648 ks, 738 ks, and 758 ks for pn, MOS1, and MOS2, respectively. With this "deep" dataset, we could detect the Fe K line and obtain a strong constraint on cluster metallicity, which is difficult to achieve for clusters at z > 1. The best-fit abundance is 0.46+-0.07+0.11 times the solar value. The Fe line emission also allows us to directly estimate the redshift of diffuse gas, with a value z = 1.14-0.01+0.01 This is one of the first clusters whose X-ray redshift is directly measured prior to the secure knowledge of cluster redshift by optical/NIR spectroscopy. We could also estimate the X-ray redshift separately for each of the two lobes in the double-lobed structure, and the result is consistent with the two lobes being part of one cluster system at the same redshift. Comparison with other metallicity measurements of nearby and distant clusters shows that there is little evolution in the ICM metallicity from z ∼ 1 to the present.

    原文英語
    頁(從 - 到)819-825
    頁數7
    期刊Astronomy and Astrophysics
    417
    發行號3
    DOIs
    出版狀態已發佈 - 2004 四月

    ASJC Scopus subject areas

    • 天文和天體物理學
    • 空間與行星科學

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