论文标题
类星体红移错误对Lyman- $α$森林相关功能的影响
The effect of quasar redshift errors on Lyman-$α$ forest correlation functions
论文作者
论文摘要
使用来自暗能量光谱仪器（DESI）调查的合成lyman-$α$森林，我们介绍了误差在估计莱曼 - $α$相关功能的估计中的影响。估计性红移的估计值是几百$ \ text {km s}^{ - 1} \，$，$，由于发射线的广泛性以及与其他排放线的内在变化。我们将高斯随机红移错误注入模拟的类星体目录，并测量自动相关和Lyman-$α$ -Quasar互相关函数。我们发现在径向方向上涂抹了BAO特征，但是峰位置的变化可以忽略不计。但是，我们看到横向横向视线的小分离的显着非物理相关性，随着红移误差的幅度增加。我们解释了这种污染是由于类星体红移误差引起的测得的平均连续体扩大的结果，并结合了小尺度上模拟类星体的不切实际强的聚类。
Using synthetic Lyman-$α$ forests from the Dark Energy Spectroscopic Instrument (DESI) survey, we present a study of the impact of errors in the estimation of quasar redshift on the Lyman-$α$ correlation functions. Estimates of quasar redshift have large uncertainties of a few hundred $\text{km s}^{-1}\,$ due to the broadness of the emission lines and the intrinsic shifts from other emission lines. We inject Gaussian random redshift errors into the mock quasar catalogues, and measure the auto-correlation and the Lyman-$α$-quasar cross-correlation functions. We find a smearing of the BAO feature in the radial direction, but changes in the peak position are negligible. However, we see a significant unphysical correlation for small separations transverse to the line of sight which increases with the amplitude of the redshift errors. We interpret this contamination as a result of the broadening of emission lines in the measured mean continuum, caused by quasar redshift errors, combined with the unrealistically strong clustering of the simulated quasars on small scales.
