Non-Gaussianity due to possible residual foreground signals in Wilkinson Microwave Anistropy Probe first-year data using spherical wavelet approaches
Liu, X; Zhang SN(张双南); Zhang, SN
刊名ASTROPHYSICAL JOURNAL
2005
卷号633期号:2页码:542-551
关键词cosmic microwave background methods : data analysis
学科分类Astronomy & Astrophysics
DOI10.1086/431729
通讯作者Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China ; Tsing Hua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China ; Univ Alabama, Dept Phys, Huntsville, AL 35899 USA ; NASA, George C Marshall Space Flight Ctr, Space Sci Lab, Huntsville, AL 35812 USA ; Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100039, Peoples R China
文章类型Article
英文摘要We perform multiscale non-Gaussianity detection and localization to the Wilkinson Microwave Anisotropy Probe (WMAP) first-year data in both wavelet and real spaces. Such an analysis is facilitated by spherical wavelet transform and inverse transform techniques developed by the YAWtb team. Skewness and kurtosis as test statistics are calculated on scales from about 1 degrees to 30 degrees on the sky, as well as toward different directions using anisotropic spherical Morlet wavelets (SMW). A maximum deviation from Gaussian simulations with a right tail probability of similar to 99.9% is detected at an angular scale of similar to 12 degrees at an azimuthal orientation of similar to 0 degrees on the sky. In addition, some significant non-Gaussian spots have been identified and localized in real space from both the combined Q-V-W map recommended by the WMAP team and the Tegmark foreground-cleaned map. Systematic effects due to beams and noise can be rejected as the source of this non-Gaussianity. Several tests show that residual foreground contamination may significantly contribute to this non-Gaussian feature. It is thus still premature to do more precise tests on the non-Gaussianity of the intrinsic CMB fluctuations before we can identify the origin of these foreground signals, understand their nature, and finally remove them from the CMB maps completely.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS记录号WOS:000233239000002
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被引频次:20[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/237885
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Liu, X,Zhang SN,Zhang, SN. Non-Gaussianity due to possible residual foreground signals in Wilkinson Microwave Anistropy Probe first-year data using spherical wavelet approaches[J]. ASTROPHYSICAL JOURNAL,2005,633(2):542-551.
APA Liu, X,张双南,&Zhang, SN.(2005).Non-Gaussianity due to possible residual foreground signals in Wilkinson Microwave Anistropy Probe first-year data using spherical wavelet approaches.ASTROPHYSICAL JOURNAL,633(2),542-551.
MLA Liu, X,et al."Non-Gaussianity due to possible residual foreground signals in Wilkinson Microwave Anistropy Probe first-year data using spherical wavelet approaches".ASTROPHYSICAL JOURNAL 633.2(2005):542-551.
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