Modeling the WMAP large-angle anomalies as an effect of a local density inhomogeneity
文献类型：期刊论文
| 作者 | He, Li-Ping1,2 ; Guo, Quan1
|
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2010-02-01 |
| 卷号 | 10期号:2页码:116-124 |
| 关键词 | cosmology: cosmic microwave background cosmology: large-scale structure of universe |
| 英文摘要 | We investigate large-angle scale temperature anisotropy in the Cosmic Microwave Background (CMB) with the Wilkinson Microwave Anisotropy Probe (WMAP) data and model the large-angle anomalies as the effect of the CMB quadrupole anisotropies caused by the local density inhomogeneities. The quadrupole caused by the local density inhomogeneities is different from the special relativity kinematic quadrupole. If the observer inhabits a strong inhomogeneous region, the local quadrupole should not be neglected. We calculate such local quadrupole under the assumption that there is a huge density fluctuation field in the direction (284 degrees, 74 degrees), where the density fluctuation is 10(-3), and its center is similar to 112 h(-1) Mpc away from us. After removing such mock signals from WMAP data, the power in the quadrupole, C(2). increases from the range (200 similar to 260 mu K(2)) to similar to 1000 mu K(2). The quantity S, which is used to estimate the alignment between the quadrupole and the octopole, decreases 2 from (0.7 similar to 0.74) to (0.31 similar to 0.37), while the model predicts that C(2) = 1071.5 mu K(2), and S = 0.412. So our local density inhomogeneity model can, in part, explain the WMAP low-l anomalies. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000275349700002 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7719]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Li-Ping,Guo, Quan. Modeling the WMAP large-angle anomalies as an effect of a local density inhomogeneity[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2010,10(2):116-124. |
| APA | He, Li-Ping,&Guo, Quan.(2010).Modeling the WMAP large-angle anomalies as an effect of a local density inhomogeneity.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,10(2),116-124. |
| MLA | He, Li-Ping,et al."Modeling the WMAP large-angle anomalies as an effect of a local density inhomogeneity".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 10.2(2010):116-124. |
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来源：国家天文台
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