Contribution of Radio Halos to the Foreground for SKA EoR Experiments
文献类型：期刊论文
| 作者 | Li,Weitian7; Xu,Haiguang1,7,8; Ma,Zhixian2; Hu,Dan7; Zhu,Zhenghao7; Shan,Chenxi7; Wang,Jingying3; Gu,Junhua4 ; Zheng,Dongchao7; Lian,Xiaoli7
|
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-07-11 |
| 卷号 | 879期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | dark ages, reionization, first stars early universe galaxies: clusters: intracluster medium methods: data analysis techniques: interferometric |
| DOI | 10.3847/1538-4357/ab21bc |
| 英文摘要 | Abstract The overwhelming foreground contamination is one of the primary impediments to probing the Epoch of Reionization (EoR) through measuring the redshifted 21 cm signal. Among various foreground components, radio halos are less studied and their impacts on the EoR observations are still poorly understood. In this work, we employ the Press–Schechter formalism, merger-induced turbulent reacceleration model, and the latest SKA1-Low layout configuration to simulate the SKA “observed” images of radio halos. We calculate the one-dimensional power spectra from simulated images and find that radio halos can be about 104, 103, and 102.5 times more luminous than the EoR signal on scales of in the 120–128, 154–162, and 192–200 MHz bands, respectively. By examining the two-dimensional power spectra inside properly defined EoR windows, we find that the power leaked by radio halos can still be significant, as the power ratios of radio halos to the EoR signal on scales of can be up to about 230%–800%, 18%–95%, and 7%–40% in the three bands when the 68% uncertainties caused by the variation of the number density of bright radio halos are considered. Furthermore, we find that radio halos located inside the far side lobes of the station beam can also impose strong contamination within the EoR window. In conclusion, we argue that radio halos are severe foreground sources and need serious treatments in future EoR experiments. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-879-2-AB21BC |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26891]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China 2.Department of Electronic Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China 3.Department of Physics and Astronomy, University of the Western Cape, Cape Town 7535, South Africa 4.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, People's Republic of China 5.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China 6.School of Mathematics, Physics and Statistics, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China 7.School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China; hgxu@sjtu.edu.cn, liweitianux@sjtu.edu.cn 8.Tsung-Dao Lee Institute, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Li,Weitian,Xu,Haiguang,Ma,Zhixian,et al. Contribution of Radio Halos to the Foreground for SKA EoR Experiments[J]. The Astrophysical Journal,2019,879(2). |
| APA | Li,Weitian.,Xu,Haiguang.,Ma,Zhixian.,Hu,Dan.,Zhu,Zhenghao.,...&Wu,Xiang-Ping.(2019).Contribution of Radio Halos to the Foreground for SKA EoR Experiments.The Astrophysical Journal,879(2). |
| MLA | Li,Weitian,et al."Contribution of Radio Halos to the Foreground for SKA EoR Experiments".The Astrophysical Journal 879.2(2019). |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。