论文标题
来自SDSS-DR12类星体调查的三点角相关函数中的Baryon声学振荡签名
Baryon acoustic oscillations signature in the three-point angular correlation function from the SDSS-DR12 quasar survey
论文作者
论文摘要
目前，通过几个宇宙学示踪剂和不同的统计估计器在各种红移中探测了大规模宇宙的聚类特性。在这里，我们使用三点相关函数（3PACF）来探测来自Sloan Digital Sky调查的第十二个数据发行中的Quasars目录中的Baryon声学振荡（BAO）特征，该调查的平均红移Z = 2.225，可检测具有2.9σ的统计意义的BAO刻痕，使用了2.9σ，使用了lognorm op nognorm op nognorm opernorm sorm。遵循3PACF的准模型与模型的方法，我们发现三角形的BAO横向特征$θ_1= 1.0^\ circ $和$θ_2= 1.5^\ circ $，$α= 1.59 \ pm 0.17 $ 0.17 $ rad，Anglular Ba s $ s $ s $ s = 1.59 = 1.59 \ pm 0.21^\ circ $，与最近的工作（$θ_{bao} = 1.77^\ circ \ pm 0.31^\ circ $）中发现的值非常吻合。此外，我们进行了两种类型的测试：一种是通过数据集中的随机位移确认BAO信号在3PACF中的鲁棒性，另一种是验证我们随机样品的适用性，实际上并未显示任何可能偏见我们结果的签名。
The clustering properties of the Universe at large-scales are currently being probed at various redshifts through several cosmological tracers and with diverse statistical estimators. Here we use the three-point angular correlation function (3PACF) to probe the baryon acoustic oscillation (BAO) features in the quasars catalogue from the twelfth data release of the Sloan Digital Sky Survey, with mean redshift z = 2.225, detecting the BAO imprint with a statistical significance of 2.9σ, obtained using lognormal mocks. Following a quasi model-independent approach for the 3PACF, we find the BAO transversal signature for triangles with sides $θ_1 = 1.0^\circ$ and $θ_2 = 1.5^\circ$ and the angle between them of $α= 1.59 \pm 0.17$ rad, a value that corresponds to the angular BAO scale $θ_{BAO} = 1.82^\circ \pm 0.21^\circ$ , in excellent agreement with the value found in a recent work ($θ_{BAO} = 1.77^\circ \pm 0.31^\circ$ ) applying the 2PACF to similar data. Moreover, we performed two type of tests: one to confirm the robustness of the BAO signal in the 3PACF through random displacements in the dataset, and the other to verify the suitability of our random samples, a null test that in fact does not show any signature that could bias our results.
