论文标题
宇宙空隙与Lyman-$α$ Forest之间的相关性的首次测量
First measurement of the correlation between cosmic voids and the Lyman-$α$ forest
论文作者
论文摘要
我们报告了以红移z = 2.49的中间检测到宇宙空隙周围的大规模物质流动的首次检测。在SDSS Stripe 82中的Eboss Lyman-$α$（Lya）森林中构建的大规模物质密度密度的层析成像图中，空隙是确定的。我们测量了围绕voids的流量的烙印，即红移空间畸变（RSD），其统计学意义为10 $σ$。线性RSD模型描述了空隙 - 森林互相关的四极杆。派生的RSD参数为$β= 0.52 \ pm 0.05 $。我们的模型解释了沿平行的类星体视线沿线的LYA数据引起的层合效应。这项工作铺平了在当前无法获得银河系调查无法访问的红移的增长率测量的道路。
We report the first detection of large-scale matter flows around cosmic voids at a median redshift z = 2.49. Voids are identified within a tomographic map of the large-scale matter density built from eBOSS Lyman-$α$ (Lya) forests in SDSS Stripe 82. We measure the imprint of flows around voids, known as redshift-space distortions (RSD), with a statistical significance of 10 $σ$. The observed quadrupole of the void-forest cross-correlation is described by a linear RSD model. The derived RSD parameter is $β= 0.52 \pm 0.05$. Our model accounts for the tomographic effect induced by the Lya data being located along parallel quasar lines of sight. This work paves the way towards growth-rate measurements at redshifts currently inaccessible to galaxy surveys.
