Hinton Samuel R, Kazin Eyal, Davis Tamara M, Blake Chris, Brough Sarah, Colless Matthew, Couch Warrick J, Drinkwater Michael J, Glazebrook Karl, Jurek Russell J, Parkinson David, Pimbblet Kevin A, Poole Gregory B, Pracy Michael, Woods David
School of Mathematics and Physics, The University of Queensland, Brisbane, QLD 4072, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO).
ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia.
Mon Not R Astron Soc. 2016 Oct 23;464(4):4807-4822. doi: 10.1093/mnras/stw2725. eCollection 2017 Feb 1.
We present results from the 2D anisotropic baryon acoustic oscillation (BAO) signal present in the final data set from the WiggleZ Dark Energy Survey. We analyse the WiggleZ data in two ways: first using the full shape of the 2D correlation function and secondly focusing only on the position of the BAO peak in the reconstructed data set. When fitting for the full shape of the 2D correlation function we use a multipole expansion to compare with theory. When we use the reconstructed data we marginalize over the shape and just measure the position of the BAO peak, analysing the data in wedges separating the signal along the line of sight from that parallel to the line of sight. We verify our method with mock data and find the results to be free of bias or systematic offsets. We also redo the pre-reconstruction angle-averaged (1D) WiggleZ BAO analysis with an improved covariance and present an updated result. The final results are presented in the form of Ω , (), and () for three redshift bins with effective redshifts = 0.44, 0.60, and 0.73. Within these bins and methodologies, we recover constraints between 5 and 22 per cent error. Our cosmological constraints are consistent with flat ΛCDM cosmology and agree with results from the Baryon Oscillation Spectroscopic Survey.
我们展示了来自WiggleZ暗能量巡天最终数据集的二维各向异性重子声学振荡（BAO）信号的结果。我们用两种方法分析WiggleZ数据：第一种是使用二维相关函数的完整形状，第二种是仅关注重建数据集中BAO峰值的位置。在拟合二维相关函数的完整形状时，我们使用多极展开来与理论进行比较。当使用重建数据时，我们对形状进行边缘化处理，只测量BAO峰值的位置，通过沿视线方向与平行于视线方向分离信号的楔形区域来分析数据。我们用模拟数据验证了我们的方法，发现结果没有偏差或系统偏移。我们还用改进的协方差重新进行了重建前角度平均（一维）的WiggleZ BAO分析，并给出了更新的结果。最终结果以有效红移分别为0.44、0.60和0.73的三个红移区间的Ω 、（）和（）的形式呈现。在这些区间和方法内，我们得到的误差在5%到22%之间。我们的宇宙学约束与平坦的ΛCDM宇宙学一致，并且与重子振荡光谱巡天的结果相符。
