SIMULATING THE GALAXY CLUSTER "EL GORDO" AND IDENTIFYING THE MERGER CONFIGURATION
文献类型：期刊论文
| 作者 | Zhang, Congyao1; Yu, Qingjuan1; Lu, Youjun2
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2015-11-10 |
| 卷号 | 813期号:2 |
| 关键词 | galaxies: clusters: general galaxies: clusters: individual (ACT-CL J0102-4915) large-scale structure of universe methods: numerical X-rays: galaxies: clusters |
| 英文摘要 | The observational features of the massive galaxy cluster "El Gordo" (ACT-CL J0102-4915), such as the X-ray emission, the Sunyaev-Zel'dovich (SZ) effect, and the surface mass density distribution, indicate that they are caused by an exceptional ongoing high-speed collision of two galaxy clusters, similar to the well-known Bullet Cluster. We perform a series of hydrodynamical simulations to investigate the merging scenario and identify the initial conditions for the collision in ACT-CL J0102-4915. By surveying the parameter space of the various physical quantities that describe the two colliding clusters, including their total mass (M), mass ratio (xi), gas fractions (f(b)), initial relative velocity (V), and impact parameter (P), we find an off-axis merger with P similar to 800 h(70)(-1) kpc, V similar to 2500 km s(-1), M similar to 3 x 10(15) M-circle dot, and xi = 3.6 that can lead to most of the main observational features of ACT-CL J0102-4915. Those features include the morphology of the X-ray emission with a remarkable wake-like substructure trailing after the secondary cluster, the X-ray luminosity and the temperature distributions, and also the SZ temperature decrement. The initial relative velocity required for the merger is extremely high and rare compared to that inferred from currently available Lambda cold dark matter (Lambda CDM) cosmological simulations, which raises a potential challenge to the Lambda CDM model, in addition to the case of the Bullet Cluster. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000365288900049 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5535]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Congyao,Yu, Qingjuan,Lu, Youjun. SIMULATING THE GALAXY CLUSTER "EL GORDO" AND IDENTIFYING THE MERGER CONFIGURATION[J]. ASTROPHYSICAL JOURNAL,2015,813(2). |
| APA | Zhang, Congyao,Yu, Qingjuan,&Lu, Youjun.(2015).SIMULATING THE GALAXY CLUSTER "EL GORDO" AND IDENTIFYING THE MERGER CONFIGURATION.ASTROPHYSICAL JOURNAL,813(2). |
| MLA | Zhang, Congyao,et al."SIMULATING THE GALAXY CLUSTER "EL GORDO" AND IDENTIFYING THE MERGER CONFIGURATION".ASTROPHYSICAL JOURNAL 813.2(2015). |
入库方式： OAI收割
来源：国家天文台
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