A CHANDRA STUDY OF THE IMAGE POWER SPECTRA OF 41 COOL CORE AND NON-COOL CORE GALAXY CLUSTERS
文献类型：期刊论文
| 作者 | Zhang, Chenhao1; Xu, Haiguang1,2; Zhu, Zhenghao1; Li, Weitian1; Hu, Dan1; Wang, Jingying3 ; Gu, Junhua3; Gu, Liyi4; Zhang, Zhongli5; Liu, Chengze1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-06-01 |
| 卷号 | 823期号:2 |
| 关键词 | galaxies: clusters: general galaxies: clusters: intracluster medium techniques: imaging spectroscopy X-rays: galaxies: clusters |
| 英文摘要 | In this work we propose a new diagnostic to segregate cool core (CC) clusters from non-CC (NCC) clusters by studying the two-dimensional power spectra of the X-ray images observed with the Chandra X-ray observatory. Our sample contains 41 members (z = 0.01-0.54) which are selected from the Chandra archive when a high photon count, an adequate angular resolution, a relatively complete detector coverage, and coincident CC-NCC classifications derived with three traditional diagnostics are simultaneously guaranteed. We find that in the log-log space the derived image power spectra can be well represented by a constant model component at large wavenumbers, while at small wavenumbers a power excess beyond the constant component appears in all clusters, with a clear tendency that the excess is stronger in CC clusters. By introducing a new CC diagnostic parameter, i.e., the power excess index (PEI), we classify the clusters in our sample and compare the results with those obtained with three traditional CC diagnostics. We find that the results agree with each other very well. By calculating the PEI values of the simulated clusters, we find that the new diagnostic works well at redshifts up to 0.5 for intermediately sized and massive clusters with a typical Chandra or XMM-Newton pointing observation. The new CC diagnostic has several advantages over its counterparts, e.g., it is free of the effects of the commonly seen centroid shift of the X-ray halo caused by merger event, and the corresponding calculation is straightforward, almost irrelevant to the complicated spectral analysis. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000377410000047 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5334]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Shanghai Jiao Tong Univ, Dept Phys & Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China 2.Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, 800 Dongchuan Rd, Shanghai 200240, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China 4.SRON Netherlands Inst Space Res, Sorbonnelaan 2, NL-3584 CA Utrecht, Netherlands 5.Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85740 Garching, Germany 6.Shanghai Jiao Tong Univ, Dept Elect Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Chenhao,Xu, Haiguang,Zhu, Zhenghao,et al. A CHANDRA STUDY OF THE IMAGE POWER SPECTRA OF 41 COOL CORE AND NON-COOL CORE GALAXY CLUSTERS[J]. ASTROPHYSICAL JOURNAL,2016,823(2). |
| APA | Zhang, Chenhao.,Xu, Haiguang.,Zhu, Zhenghao.,Li, Weitian.,Hu, Dan.,...&Wu, Xiang-Ping.(2016).A CHANDRA STUDY OF THE IMAGE POWER SPECTRA OF 41 COOL CORE AND NON-COOL CORE GALAXY CLUSTERS.ASTROPHYSICAL JOURNAL,823(2). |
| MLA | Zhang, Chenhao,et al."A CHANDRA STUDY OF THE IMAGE POWER SPECTRA OF 41 COOL CORE AND NON-COOL CORE GALAXY CLUSTERS".ASTROPHYSICAL JOURNAL 823.2(2016). |
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来源：国家天文台
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