Cosmological constraint from the 2dF QSO spatial power spectrum
Cosmological constraint from the 2dF QSO spatial power spectrum
复制标题
来自 2dF QSO 空间功率谱的宇宙学约束
DOI：
10.1046/j.1365-8711.2002.05575.x
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发表时间：
2002
影响因子：
4.8
通讯作者：
Kazuhiro Yamamoto
中科院分区：
文献类型：
--
作者：
Kazuhiro Yamamoto
We obtain constraints on the cosmological density parameters, Ω m and Ω b , by comparing the preliminary measurement of the quasi-stellar object (QSO) power spectrum from the Two-Degree Field (2dF) QSO Redshift (2QZ) survey with results from an analytic technique of power spectrum estimation, described herein. We demonstrate the validity of the analytic approach by comparing the results with the power spectrum of an N-body simulation. We find a better fit to the shape of the QSO power spectrum for low-density models with Ω m = 0.1-0.4. We show that a finite baryon fraction Ω b /Ω m = 0.2, consistent with observations of the cosmic microwave background anisotropies and nucleosynthesis, fits the observational result of the 2QZ survey better, though the constraint is not very tight. By using the Fisher matrix technique, we investigate just how large a survey would be required before a significant constraint on the density parameters could be obtained. We demonstrate that the constraint could be significantly improved if the survey was four times larger.
