中文

2dF星系红移测量:最终数据集的功谱分析及其宇宙学意义

天体物理学 2008-11-26 v2

摘要

我们报告了对最终2dF星系红移测量进行的功谱分析,采用直接的傅里叶方法。所用样本包括221,414颗测得红移的星系。我们详细检讨了样本选择的建模。推导了一种新的角掩模,基于对光度校准的修订。通过将调查按rest-frame颜色划分,推导出每种Population的自洽的k-校正和演化处理。确定了用于功谱估计的协方差矩阵,采用两种构建模拟调查的方法,这些方法用于演示输入宇宙学模型能够被正确恢复。我们确信2dFGRS功谱可以用于推断宇宙的物质含量。在大尺度上,我们的功谱估计显示出CDM模型中预测的“联合子声峰”。在假设原始n_s=1光谱、h=0.72且中微子质量可忽略不计的CDM模型下,首选参数为Omega_M h = 0.168 \pm 0.016 和质子分数Omega_b /Omega_M = 0.185\pm0.046(1σ\sigma误差)。Omega_M h的值比我们2001年对部分完整2dFGRS的分析中0.20 \pm 0.03的值低1σ\sigma。这一偏移主要归因于来自新抽样空间区域的信号,而非对观测选择处理的细化。这一分析因此暗示该密度显著低于标准Omega_M =0.3:结合来自WMAP的CMB数据,我们推断Omega_M =0.231\pm 0.021。(已节选)

关键词

引用

@article{arxiv.astro-ph/0501174,
  title  = {The 2dF Galaxy Redshift Survey: Power-spectrum analysis of the final dataset and cosmological implications},
  author = {S. Cole and W. J. Percival and J. A. Peacock and P. Norberg and C. M. Baugh and C. S. Frenk and I. Baldry and J. Bland-Hawthorn and T. Bridges and R. Cannon and M. Colless and C. Collins and W. Couch and N. J. G. Cross and G. Dalton and V. R. Eke and R. De Propris and S. P. Driver and G. Efstathiou and R. S. Ellis and K. Glazebrook and C. Jackson and A. Jenkins and O. Lahav and I. Lewis and S. Lumsden and S. Maddox and D. Madgwick and B. A. Peterson and W. Sutherland and K. Taylor},
  journal= {arXiv preprint arXiv:astro-ph/0501174},
  year   = {2008}
}

备注

Updated to match the in press MNRAS version. P(k) data and covariance matrix available at http://www.mso.anu.edu.au/2dFGRS/Public/Release/PowSpec