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题名: Primordial non-Gaussianity estimator: The inhomogeneous noise effect
作者: Yu Bo(余波)1; Lu Tan(陆埮)2, 3
刊名: PHYSICAL REVIEW D
出版日期: 2008-09-01
卷号: 78, 期号:6
DOI: 10.1103/PhysRevD.78.063008
文章类型: Article
英文摘要: Since the inhomogeneous instrument noise can produce extra non-Gaussianity in the cosmic microwave background (CMB) anisotropy, its effect should be carefully subtracted in the primordial non-Gaussianity estimation. We calculate the probability distribution function of the CMB anisotropy for a local type of non-Gaussianity, from which the optimal estimator in the general case ( inhomogeneous noise and cut sky) is obtained. The new estimator obtained here is different from the popular one, since the inhomogeneous noise and cut sky effects are completely accounted for. The CMB anisotropy in the new estimator is noise weighted. The noise weight is different from that used by the WMAP Collaboration in their 5-year data analysis. Although it is still difficult to calculate the new estimator rigorously, for the case of the slightly inhomogeneous noise, there exists a series expansion method to compute the new estimator. Each order in the series is suppressed by two factors, (sigma(2)/sigma(2)(i) - 1) and C(l)/C(l)(tot), which make the method feasible. Through the Edgeworth expansion we can generalize our discussion to other types of non-Gaussianity.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]: Astronomy & Astrophysics ; Physics
关键词[WOS]: PROBE WMAP OBSERVATIONS ; MICROWAVE ; MAPS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000259692800018
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15891
Appears in Collections:陆埮_期刊论文

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作者单位: 1.Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China
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