论文标题
eBoss上类星体上的void bao测量
Void BAO measurements on quasars from eBOSS
论文作者
论文摘要
我们根据构型空间中的扩展巴里昂振荡光谱调查数据版本16介绍了基于数量（QSO）样本的空隙聚类。我们将空隙定义为由delaunay四面体计算出的重叠的空孔，被类星体四重奏跨越，允许估计不足区域的深度。为了最大化BAO信噪比，我们仅考虑Radii大于36 $ H^{ - 1} $ MPC的空隙。我们的分析表明，QSO和空隙的跨相关性中的BAO峰为负峰。 QSO自动相关的联合BAO测量以及与空隙的相应互相关显示了QSO模拟的70美元$ \％$，平均改善$ \ sim5 \％$。但是，在SDSS数据上，我们发现与宇宙差异兼容的改进没有。对于模拟和数据，添加空隙都不会引入任何偏见。我们在flat $λ$ CDM假设下发现，在有效的红移$ z _ {\ rm eff} = 1.48 $ of $ d_v（z _ {\ rm eff}）= 26.297 \ pm0.547 $的数据下进行距离关节测量。一个类似于DESI的调查的预测，具有相似有效体积的1000个盒子的结果与轻单模型相同，平均为4.8 $ \％$ $ \％$提高了68 $ \％$ \％的盒子。
We present the clustering of voids based on the quasar (QSO) sample of the extended Baryon Oscillation Spectroscopic Survey Data Release 16 in configuration space. We define voids as overlapping empty circumspheres computed by Delaunay tetrahedra spanned by quartets of quasars, allowing for an estimate of the depth of underdense regions. To maximise the BAO signal-to-noise ratio, we consider only voids with radii larger than 36$h^{-1}$Mpc. Our analysis shows a negative BAO peak in the cross-correlation of QSOs and voids. The joint BAO measurement of the QSO auto-correlation and the corresponding cross-correlation with voids shows an improvement in 70$\%$ of the QSO mocks with an average improvement of $\sim5\%$. However, on the SDSS data, we find no improvement compatible with cosmic variance. For both mocks and data, adding voids does not introduce any bias. We find under the flat $Λ$CDM assumption, a distance joint measurement on data at the effective redshift $z_{\rm eff}=1.48$ of $D_V(z_{\rm eff})=26.297\pm0.547$. A forecast of a DESI-like survey with 1000 boxes with a similar effective volume recovers the same results as for light-cone mocks with an average of 4.8$\%$ improvement in 68$\%$ of the boxes.
