论文标题
星系数计数的镜头潜力的估计器
An Estimator for Lensing Potential from Galaxy Number Counts
论文作者
论文摘要
我们从包含线性和二次项的星系数计数中得出了镜头电位的估计器。我们表明，该估计器的信噪比比强度映射的相应估计器要大得多。这是由于数字计数角幂谱的附加镜头项所致，该镜头量谱已经在线性顺序上存在。我们估计未来光度测量的信噪比。特别是在高红移时，$ z \ gtrsim 1.5 $，信号与噪声比可能变为30阶。因此，光度测量中的数量计数将是测量层析成像镜头镜头光谱的绝佳方法。
We derive an estimator for the lensing potential from galaxy number counts which contains a linear and a quadratic term. We show that this estimator has a much larger signal-to-noise ratio than the corresponding estimator from intensity mapping. This is due to the additional lensing term in the number count angular power spectrum which is present already at linear order. We estimate the signal-to-noise ratio for future photometric surveys. Particularly at high redshifts, $z\gtrsim 1.5$, the signal to noise ratio can become of order 30. Therefore, the number counts in photometric surveys would be an excellent means to measure tomographic lensing spectra.
