Baryon acoustic oscillations from the complete SDSS-III Ly$\alpha$-quasar cross-correlation function at $z=2.4$
Baryon acoustic oscillations from the complete SDSS-III Ly$\alpha$-quasar cross-correlation function at $z=2.4$
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DOI：
10.1051/0004-6361/201731731
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发表时间：
2017-08
影响因子：
6.5
通讯作者：
Hélion Marie du Mas des Bourboux;J. Goff;M. Blomqvist;N. Busca;J. Guy;J. Rich;C. Yéche;J. Bautista-J.
中科院分区：
文献类型：
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作者：
Hélion Marie du Mas des Bourboux;J. Goff;M. Blomqvist;N. Busca;J. Guy;J. Rich;C. Yéche;J. Bautista-J.
在类星体的互相关中测量了平均红移z = 2.40的Lyα-forest通量传输的重子声振荡（BAO）。测量使用完整的斯隆数字巡天（SDSS-III）数据样本：SDSS数据发布DR 12中的168889个森林和234367个类星体。除了对我们之前使用DR 11的研究进行统计改进外，我们还在分析层面进行了许多改进，从而能够更准确地测量这种互相关。我们还开发了交叉相关的第一个模拟，使我们能够测试我们的数据分析的不同方面，并寻找在确定BAO峰位置的潜在系统误差。我们测量了两个比值DH（z = 2.40）/rd = 9.01 ± 0.36和DM（z = 2.40）/rd = 35.7 ± 1.7，其中误差包括类星体非线性速度的边缘化以及金属和类星体的互相关等影响。这些结果与描述观测到的宇宙微波背景各向异性的平坦-ΛCDM模型的预测值在1.8σ之内。结合Lyα-森林自相关函数，我们得到DH（z = 2.40）/rd = 8.94 ± 0.22和DM（z = 2.40）/rd = 36.6 ± 1.2，与相同的flat-ΛCDM模型相差2.3σ。关键词：宇宙学参数/暗能量/宇宙大尺度结构
We present a measurement of baryon acoustic oscillations (BAO) in the cross-correlation of quasars with the Lyα-forest flux transmission at a mean redshift of z = 2.40. The measurement uses the complete Sloan Digital Sky Survey (SDSS-III) data sample: 168 889 forests and 234 367 quasars from the SDSS data release DR12. In addition to the statistical improvement on our previous study using DR11, we have implemented numerous improvements at the analysis level enabling a more accurate measurement of this cross-correlation. We have also developed the first simulations of the cross-correlation that allow us to test different aspects of our data analysis and to search for potential systematic errors in the determination of the BAO peak position. We measure the two ratios DH(z = 2.40) /rd = 9.01 ± 0.36 and DM(z = 2.40) /rd = 35.7 ± 1.7, where the errors include marginalization over the non-linear velocity of quasars and the cross-correlation of metals and quasars, among other effects. These results are within 1.8σ of the prediction of the flat-ΛCDM model describing the observed cosmic microwave background anisotropies. We combine this study with the Lyα-forest auto-correlation function, yielding DH(z = 2.40) /rd = 8.94 ± 0.22 and DM(z = 2.40) /rd = 36.6 ± 1.2, within 2.3σ of the same flat-ΛCDM model. Key words: cosmological parameters / dark energy / large-scale structure of Universe