ANOMALOUS ANISOTROPIC CROSS-CORRELATIONS BETWEEN WMAP CMB MAPS AND SDSS GALAXY DISTRIBUTION AND IMPLICATIONS ON THE DARK FLOW SCENARIO
文献类型：期刊论文
| 作者 | Li, Zhigang1,2; Zhang, Pengjie3; Chen, Xuelei1,4
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-10-20 |
| 卷号 | 758期号:2 |
| 关键词 | cosmic background radiation cosmology: observations galaxies: peculiar large-scale structure of universe |
| 英文摘要 | We search for the dark flow induced diffuse kinetic Sunyaev-Zel'dovich (kSZ) effect through CMB-galaxy cross-correlation. Such angular correlation is anisotropic, with a unique cos(theta(DF)) angular dependence, and hence can be distinguished from other components. Here,theta(DF) is the angle between the opposite dark flow direction and the direction of the sky where the correlation is measured. We analyze the KIAS-VAGC galaxy catalog of SDSS-DR7 and the WMAP seven-year temperature maps, applying an unbiased optimal weighting scheme to eliminate any statistically isotropic components and to enhance the dark flow detection signal. Non-zero weighted cross-correlations are detected at 3.5 sigma for the redshift bin z < 0.1 and at 3 sigma for the bin 0.1 < z < 0.2, implying the existence of statistically anisotropic components in CMB. However, further analysis does not support the dark flow explanation. The observed directional dependence deviates from the proportional to cos theta(DF) relation expected, and hence cannot be explained by the presence of a single dark flow, and if the observed cross-correlation is generated by the dark flow induced kSZ effect, the velocity would be too high (greater than or similar to 6000 km s(-1)). We report this work as the first attempt to search for dark flow through weighted CMB-galaxy cross-correlation and to draw the attention on the sources of the detected anomalous CMB-galaxy cross-correlation. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000310562000059 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6224]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Shang Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 4.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Zhigang,Zhang, Pengjie,Chen, Xuelei. ANOMALOUS ANISOTROPIC CROSS-CORRELATIONS BETWEEN WMAP CMB MAPS AND SDSS GALAXY DISTRIBUTION AND IMPLICATIONS ON THE DARK FLOW SCENARIO[J]. ASTROPHYSICAL JOURNAL,2012,758(2). |
| APA | Li, Zhigang,Zhang, Pengjie,&Chen, Xuelei.(2012).ANOMALOUS ANISOTROPIC CROSS-CORRELATIONS BETWEEN WMAP CMB MAPS AND SDSS GALAXY DISTRIBUTION AND IMPLICATIONS ON THE DARK FLOW SCENARIO.ASTROPHYSICAL JOURNAL,758(2). |
| MLA | Li, Zhigang,et al."ANOMALOUS ANISOTROPIC CROSS-CORRELATIONS BETWEEN WMAP CMB MAPS AND SDSS GALAXY DISTRIBUTION AND IMPLICATIONS ON THE DARK FLOW SCENARIO".ASTROPHYSICAL JOURNAL 758.2(2012). |
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。