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题名:
Chandra X-ray observations of galaxy cluster A168
作者: Yang, YB; Huo Zhiying(霍志英); Zhou Xu(周旭); Xue, SJ; Mao Shude(毛淑德); Ma Jun(马骏); Chen, JS
关键词: galaxies : clusters : individual (A168) ; X-rays : galaxies : clusters ; X-rays : individual (A168)
刊名: ASTROPHYSICAL JOURNAL
发表日期: 2004-10-20
卷: 614, 期:2, 页:692-697
收录类别: SCI
英文摘要: We present Chandra X-ray observations of galaxy cluster A168 (z=0.045). Two X-ray peaks with a projected distance of 676 kpc are found to be located close to two dominant galaxies, respectively. Both peaks are significantly offset from the peak of the number density distribution of galaxies. This suggests that A168 consists of two subclusters, a northern subcluster (A168N) and a southern subcluster (A168S). Further X-ray imaging analysis reveals that (1) the X-ray isophotes surrounding the two X-ray peaks are heavily distorted and (2) an elongated and continuous filament connects the two X-ray peaks. These suggest that strong interactions have occurred between the two subclusters. Spectral analysis shows that A168 has a mean temperature of 2.53+/-0.09 keV and a mean metallicity of 0.31+/-0.04 Z(circle dot). The metallicity is roughly a constant across the cluster, but the temperature shows some systematic variations. Most X-ray, optical, and radio properties of A168 are consistent with it being an off-axis merger several gigayears after a core passage, although detailed numerical simulations are required to see whether the observed properties, in particular the significant offset between the optical and X-ray centers, can be reproduced in such a scenario.
语种: 英语
WOS记录号: WOS:000224700200016
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bao.ac.cn/handle/114a11/8112
Appears in Collections:光学天文研究部_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England

Recommended Citation:
Yang, YB,Huo, ZY,Zhou, X,et al. Chandra X-ray observations of galaxy cluster A168[J]. ASTROPHYSICAL JOURNAL,2004,614(2):692-697.
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