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arXiv 1611.08040astro-ph.CO
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测量WiggleZ星系的二维重子声学振荡信号:宇宙学约束

Measuring the 2D Baryon Acoustic Oscillation signal of galaxies in WiggleZ: Cosmological constraints

Samuel R. Hinton, Eyal Kazin, Tamara M. Davis, Chris Blake, Sarah Brough, Matthew Colless, Warrick J. Couch, Michael J. Drinkwater, Karl Glazebrook, Russel J. J… 展开作者

Samuel R. Hinton, Eyal Kazin, Tamara M. Davis, Chris Blake, Sarah Brough, Matthew Colless, Warrick J. Couch, Michael J. Drinkwater, Karl Glazebrook, Russel J. Jurek, David Parkinson, Kevin A. Pimbblet, Gregory B. Poole, Michael Pracy, David Woods

摘要:

我们目前的结果,从二维各向异性重子声学振荡(BAO)信号存在于最终的数据集从WiggleZ暗能量调查。我们以两种方式分析WiggleZ数据:首先使用2D关联函数的完整形状,其次仅关注重建数据集中的BAO峰的位置。当拟合2D关联函数的完整形状时,我们使用多极展开来与理论进行比较。当我们使用重建数据时,我们对形状进行边缘化,仅测量BAO峰值的位置,分析楔形数据,将沿着视线的信号与平行于视线的信号分开。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。我们还重做了重建前角度平均(1D)WiggleZ BAO分析与改进的协方差,并提出了更新的结果。最终结果以$Ω_c h^2$、$H(z)$和$D_A(z)$的形式给出,分别针对具有有效红移$z = 0.44$、$0.60$和$0.73$的三个红移仓。在这些箱子和方法中,我们恢复5%和22%误差之间的约束。我们的宇宙学约束与平坦$Λ$ CDM宇宙学一致,并与重子振荡谱巡天(BOSS)的结果一致。

英文摘要:

We present results from the 2D anisotropic Baryon Acoustic Oscillation (BAO) signal present in the final dataset from the WiggleZ Dark Energy Survey. We analyse the WiggleZ data in two ways: firstly using the full shape of the 2D correlation function and secondly focussing 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 marginalise 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 $Ω_c h^2$, $H(z)$, and $D_A(z)$ for three redshift bins with effective redshifts $z = 0.44$, $0.60$, and $0.73$. Within these bins and methodologies, we recover constraints between 5% and 22% error. Our cosmological constraints are consistent with Flat $Λ$CDM cosmology and agree with results from the Baryon Oscillation Spectroscopic Survey (BOSS).

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