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Modeling the WMAP large-angle anomalies as an effect of a local density inhomogeneity
He, Li-Ping1,2; Guo, Quan1
AbstractWe 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.
KeywordCosmology: Cosmic Microwave Background Cosmology: Large-scale Structure Of Universe
Indexed BySCI
WOS IDWOS:000275349700002
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
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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