ITP OpenIR  > 理论物理所1978-2010年知识产出
Measuring the galaxy power spectrum with multiresolution decomposition. IV. Redshift distortion
Yang, XH; Feng, LL; Chu, YQ; Fang, LZ; Yang, XH , Univ Sci & Technol China, Ctr Astrophys, 96 Gains Lu, Hefei 230026, Anhui, Peoples R China.
2002
发表期刊ASTROPHYSICAL JOURNAL
ISSN0004-637X
卷号566期号:2页码:630-640
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.
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
关键词Space Distortions
学科领域Physics
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收录类别SCI
WOS记录号WOS:000173804900003
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13593
专题理论物理所1978-2010年知识产出
通讯作者Yang, XH , Univ Sci & Technol China, Ctr Astrophys, 96 Gains Lu, Hefei 230026, Anhui, Peoples R China.
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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.
APA Yang, XH,Feng, LL,Chu, YQ,Fang, LZ,&Yang, XH , Univ Sci & Technol China, Ctr Astrophys, 96 Gains Lu, Hefei 230026, Anhui, Peoples R China..(2002).Measuring the galaxy power spectrum with multiresolution decomposition. IV. Redshift distortion.ASTROPHYSICAL JOURNAL,566(2),630-640.
MLA Yang, XH,et al."Measuring the galaxy power spectrum with multiresolution decomposition. IV. Redshift distortion".ASTROPHYSICAL JOURNAL 566.2(2002):630-640.
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