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题名: The hot and cold spots in five-year WMAP data
作者: Hou, Zhen1, 2, 3; Banday, A. J.2, 4; Gorski, K. M.5, 6, 7
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2009-07-01
卷号: 396, 期号:3, 页码:1273-1286
关键词: methods: data analysis ; cosmic microwave background
DOI: 10.1111/j.1365-2966.2009.14810.x
文章类型: Article
英文摘要: We present an extensive frequentist analysis of the one-point statistics (number, mean, variance, skewness and kurtosis) and two-point correlation functions determined for the local extrema of the cosmic microwave background temperature field observed in five-years of Wilkinson Microwave Anisotropy Probe (WMAP) data. Application of a hypothesis test on the one-point statistics indicates a low variance of hot and cold spots in all frequency bands of the WMAP data. The consistency of the observations with Gaussian simulations of the best-fitting cosmological model is rejected at the 95 per cent confidence level outside the WMAP KQ75 mask and the Northern hemispheres in the Galactic and ecliptic coordinate frames. We demonstrate that it is unlikely that residual Galactic foreground emission contributes to the observed non-Gaussianities. However, the application of a high-pass filter that removes large angular scale power does improve the consistency with the best-fitting cosmological model.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: NON-GAUSSIAN STATISTICS ; ANISOTROPY-PROBE DATA ; SKY MAPS ; BACKGROUND-RADIATION ; MICROWAVE SKY ; PEAKS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000267072100006
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15940
Appears in Collections:星系宇宙学和暗能量研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Max Planck Inst Astrophys, D-85748 Garching, Germany
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.Ctr Etud Spatiale Rayonnements, F-31028 Toulouse 4, France
5.CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
6.CALTECH, Pasadena, CA 91125 USA
7.Univ Warsaw Observ, PL-00478 Warsaw, Poland
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