标题： 用高红移探测约束原初非高斯性 显示英文标题

标题： Constraining Primordial Non-Gaussianity with High-Redshift Probes

摘要： 我们分析了由无量纲参数$f_{\rm NL}$描述的局部类型原初非高斯性幅度的限制。 这些限制由两种大尺度结构探针的自相关函数（ACFs）设定，即来自NRAO VLA天空巡天（NVSS）的射电源和来自斯隆数字巡天第六版发布（SDSS DR6）类星体目录（QSOs），以及它们与宇宙微波背景（CMB）温度图（积分 Sachs-Wolfe 效应）的交叉相关函数（CCFs）。 研究了几种可能影响ACFs和CCFs观测估计的系统效应，并保守地考虑了这些效应。 我们的方法利用了非高斯晕动偏差的大尺度尺度依赖性。 从NVSS CCF和QSO ACF和CCF得出的{$f_{\rm NL}$}的限制比之前从NVSS ACF得到的限制弱，但仍然与其一致。 最后，我们分别从NVSS数据和SDSS DR6 QSO数据中获得了$f_{\rm NL}=53\pm25$（$1\,\sigma$）和$f_{\rm NL}=58\pm24$（$1\,\sigma$）的限制。 显示英文摘要

摘要： We present an analysis of the constraints on the amplitude of primordial non-Gaussianity of local type described by the dimensionless parameter $f_{\rm NL}$. These constraints are set by the auto-correlation functions (ACFs) of two large scale structure probes, the radio sources from NRAO VLA Sky Survey (NVSS) and the quasar catalogue of Sloan Digital Sky Survey Release Six (SDSS DR6 QSOs), as well as by their cross-correlation functions (CCFs) with the cosmic microwave background (CMB) temperature map (Integrated Sachs-Wolfe effect). Several systematic effects that may affect the observational estimates of the ACFs and of the CCFs are investigated and conservatively accounted for. Our approach exploits the large-scale scale-dependence of the non-Gaussian halo bias. The derived constraints on {$f_{\rm NL}$} coming from the NVSS CCF and from the QSO ACF and CCF are weaker than those previously obtained from the NVSS ACF, but still consistent with them. Finally, we obtain the constraints on $f_{\rm NL}=53\pm25$ ($1\,\sigma$) and $f_{\rm NL}=58\pm24$ ($1\,\sigma$) from NVSS data and SDSS DR6 QSO data, respectively.