论文标题
星系数计数的镜头潜力的估计器
An Estimator for the 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。我们表明，这是由于数量计数角功率谱的附加镜头项所致，该镜头量谱已经以线性顺序存在。我们估计未来光度测量的信噪比。我们发现，尤其是在高红移时，$ z \ gtrsim 1.5 $，信号与噪声比可能成为30顺序。因此，我们声称，光度测量中的数量计数是测量层析成像镜头光谱光谱的出色手段。
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. We show that 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. We find that particularly at high redshifts, $z\gtrsim 1.5$, the signal to noise ratio can become of order 30. We therefore claim that number counts in photometric surveys are an excellent means to measure tomographic lensing spectra.
