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题名: Measuring the galaxy power spectrum with multiresolution decomposition. IV. Redshift distortion
作者: Yang, XH ;  Feng, LL ;  Chu, YQ ;  Fang, LZ
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2002
卷号: 566, 期号:2, 页码:630-640
关键词: SPACE DISTORTIONS
学科分类: Physics
通讯作者: Yang, XH , Univ Sci & Technol China, Ctr Astrophys, 96 Gains Lu, Hefei 230026, Anhui, Peoples R China.
部门归属: Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China; Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
英文摘要: In this paper, we develop a theory of redshift distortion of the galaxy power spectrum in the discrete wavelet transform (DWT) representation. Because the DWT power spectrum is dependent on both the scale and shape (configuration) of the decomposition modes, it is sensitive to distortion of the shape of the field. On the other hand, the redshift distortion causes a shape distortion of distributions in real space with respect to redshift space. Therefore, the shape-dependent DWT power spectrum is useful for detecting the effect of redshift distortion. We first established the mapping between the DWT power spectra in redshift and real space. The mapping depended on the redshift-distortion effects of (1) bulk velocity, (2) selection function, and (3) pairwise peculiar velocity. We then proposed beta estimators using the DWT off-diagonal power spectra. These beta estimators are model-free, even when the nonlinear redshift-distortion effect is not negligible. Moreover, these estimators do not rely on the assumption of whether the pairwise velocity dispersion is scale dependent. Tests with N-body simulation samples show that the proposed beta estimators can yield reliable measurements of beta with about 20% uncertainty for all popular dark matter models. We also develop an algorithm for reconstruction of the power spectrum in real space from the redshift-distorted power spectrum. Numerical tests also show that the real power spectrum can be well recovered from the redshift-distorted power spectrum.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000173804900003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13593
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Yang, XH,Feng, LL,Chu, YQ,et al. Measuring the galaxy power spectrum with multiresolution decomposition. IV. Redshift distortion[J]. ASTROPHYSICAL JOURNAL,2002,566(2):630-640.
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