2015/12/02 by Lei Sun, H. Zhan, Sun, L. +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries
paper · pdf · doi:10.48550/arxiv.1512.00600
openalex publication_date 2015/12/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The control of photometric redshift (photo-z) errors is a crucial and challenging task for precision weak lensing cosmology. The spacial cross-correlations (equivalently, the angular cross power spectra) of galaxies between tomographic photo-z bins are sensitive to the true redshift distribution ni(z) of each bin and hence can help calibrate the photo-z error distribution for weak lensing surveys. Using Fisher matrix analysis, we investigate the contributions of various components of the angular power spectra to the constraints of ni(z) parameters and demonstrate the importance of the cross power spectra therein, especially when catastrophic photo-z errors are present. We further study the feasibility of reconstructing ni(z) from galaxy angular power spectra using Markov Chain Monte Carlo estimation. Considering an LSST-like survey with 10 photo-z bins, we find that the underlying redshift distribution can be determined with a fractional precision (σ(θ)/θ for parameter θ) of roughly 1% and 10% for the mean redshift and width of ni(z), respectively.