标题： 利用交叉相关性进行宇宙学和光谱红移计算的联合分析 显示英文标题

标题： A Joint Analysis for Cosmology and Photometric Redshift Calculation Using Cross Correlations

摘要： 我们提出了一种方法，在更大的马尔可夫链蒙特卡洛（MCMC）分析过程中校准光谱红移箱的性质，以推断宇宙学参数。 红移箱由其均值和方差表征，这些作为自由参数被改变，并在获得宇宙学参数时进行边缘化处理。 我们证明了角功率谱框架下交叉相关的似然函数能够紧密约束红移箱的性质，从而使它们可以被很好地确定，从而减少其对宇宙学参数的影响，并避免由于红移分布估计不佳而导致的偏差。 我们演示了即使只有三个测光红移箱和三个光谱红移箱，我们也可以在 $\Delta\mu \approx 3-4 \times10^{-3}$ 的范围内准确恢复一个箱体的平均红移，并且对于接近 $z = 1$ 的星系，可以将箱体宽度确定到 $\Delta\sigma \approx 1\times10^{-3}$。 这表明我们可以将测光红移误差降低到下一代宇宙学实验所需水平。 显示英文摘要

摘要： We present a method of calibrating the properties of photometric redshift bins as part of a larger Markov Chain Monte Carlo (MCMC) analysis for the inference of cosmological parameters. The redshift bins are characterised by their mean and variance, which are varied as free parameters and marginalised over when obtaining the cosmological parameters. We demonstrate that the likelihood function for cross-correlations in an angular power spectrum framework tightly constrains the properties of bins such that they may be well determined, reducing their influence on cosmological parameters and avoiding the bias from poorly estimated redshift distributions. We demonstrate that even with only three photometric and three spectroscopic bins, we can recover accurate estimates of the mean redshift of a bin to within $\Delta\mu \approx 3-4 \times10^{-3}$ and the width of the bin to $\Delta\sigma \approx 1\times10^{-3}$ for galaxies near $z = 1$. This indicates that we may be able to bring down the photometric redshift errors to a level which is in line with the requirements for the next generation of cosmological experiments.