The Merger Dynamics of the Galaxy Cluster A1775: New Insights from Chandra and XMM-Newton for a Cluster Simultaneously Hosting a Wide-angle Tail and a Narrow-angle Tail Radio Source
文献类型：期刊论文
| 作者 | Hu,Dan2; Xu,Haiguang2,3; Zhu,Zhenghao2; Shan,Chenxi2; Zhu,Yongkai2; Fan,Shida2; Zhao,Yuanyuan2; Liu,Chengze2; Siew,Hoongwah2; Zhang,Zhongli4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-05-01 |
| 卷号 | 913期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Galaxy clusters Intracluster medium Radio galaxies Hydrodynamical simulations |
| DOI | 10.3847/1538-4357/abf09e |
| 英文摘要 | Abstract We present a new study of the merger dynamics of A1775 by analyzing the high-quality Chandra and XMM-Newton archival data. We confirm/identify an arc-shaped edge (i.e., the head) at ～48 kpc west of the X-ray peak, a split cold gas tail that extends eastward to ～163 kpc, and a plume of spiral-like X-ray excess (within about 81–324 kpc northeast of the cluster core) that connects to the end of the tail. The head, across which the projected gas temperature rises outward from to keV, is found to be a cold front with a Mach number of . Along the surfaces of the cold front and tail, typical Kelvin–Helmholtz instability features (noses and wings, etc.) are found and are used to constrain the upper limit of the magnetic field (～11.2 μG) and the viscosity suppression factor (～0.01). Combining optical and radio evidence, we propose a two-body merger (instead of systematic motion in a large-scale gas environment) scenario and have carried out idealized hydrodynamic simulations to verify it. We find that the observed X-ray emission and temperature distributions can be best reproduced with a merger mass ratio of 5 after the first pericentric passage. The NAT radio galaxy is thus more likely to be a single galaxy falling into the cluster center at a relative velocity of 2800 km s?1, a speed constrained by its radio morphology. The infalling subcluster is expected to have a relatively low gas content, because only a gas-poor subcluster can cause central-only disturbances as observed in such an off-axis merger. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-913-1-ABF09E |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/58364]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Xu,Haiguang |
| 作者单位 | 1.SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands 2.School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Minhang, Shanghai 200240, People’s Republic of China; hudan_bazhaoyu@sjtu.edu.cn, hgxu@sjtu.edu.cn 3.IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Minhang, Shanghai 200240, People’s Republic of China 4.Shanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China 5.International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia 6.Curtin Institute for Computation, Curtin University, GPO Box U1987, Perth, 6845, WA, Australia 7.Zhejiang University-Purple Mountain Observatory Joint Research Center for Astronomy, Zhejiang University, Hangzhou 310027, People’s Republic of China 8.Purple Mountain Observatory, Chinese Academy of Sciences, No.10 Yuanhua Road, Qixia District, Nanjing 210034, People’s Republic of China 9.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Hu,Dan,Xu,Haiguang,Zhu,Zhenghao,et al. The Merger Dynamics of the Galaxy Cluster A1775: New Insights from Chandra and XMM-Newton for a Cluster Simultaneously Hosting a Wide-angle Tail and a Narrow-angle Tail Radio Source[J]. The Astrophysical Journal,2021,913(1). |
| APA | Hu,Dan.,Xu,Haiguang.,Zhu,Zhenghao.,Shan,Chenxi.,Zhu,Yongkai.,...&Wu,Xiang-ping.(2021).The Merger Dynamics of the Galaxy Cluster A1775: New Insights from Chandra and XMM-Newton for a Cluster Simultaneously Hosting a Wide-angle Tail and a Narrow-angle Tail Radio Source.The Astrophysical Journal,913(1). |
| MLA | Hu,Dan,et al."The Merger Dynamics of the Galaxy Cluster A1775: New Insights from Chandra and XMM-Newton for a Cluster Simultaneously Hosting a Wide-angle Tail and a Narrow-angle Tail Radio Source".The Astrophysical Journal 913.1(2021). |
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