A Unified Photometric Redshift Calibration for Weak Lensing Surveys using the Dark Energy Spectroscopic Instrument

作者：J.U Lange, Diana Blanco, Alexie Leauthaud, A. H. Wright, Fisher, Abigail, J Ratajczak, J. Aguilar, S. Ahlen, S. Bailey, D. Bianchi, Chris Blake, D. Brooks, T. Claybaugh, Andrei Cuceu, Dawson, Kyle, Axel de la Macorra, Joseph DeRose, Arjun Dey, P. Doel, N Emas, Ferraro, Simone, Andreu Font-Ribera, J. E. Forero-Romero, C. García-Quintero, E. Gaztañaga, Satya Gontcho A Gontcho, G Gutierrez, Sven Heydenreich, H Hildebrandt, Mustapha Ishak, Jimenez, Jorge, Shahab Joudaki, R. Kehoe, Kirkby, David, T. Kisner, Kremin, Anthony, O. Lahav, C. Lamman, Martin Landriau, L. Le Guillou, M. E. Levi, L. Medina-Varela, Aaron Meisner, R. Miquel, John Moustakas, S Nadathur, Jeffrey A. Newman, N. Palanque‐Delabrouille, A. Porredon, Francisco Prada, Ignasi Pérez-Ràfols, Rossi, Graziano, Rossana Ruggeri, E. Sánchez, Christoph Saulder, David J. Schlegel, M Schubnell, David Sprayberry, Zechang Sun, G. Tarlé, B. A. Weaver, Sihan Yuan, Pauline Zarrouk, Hu Zou · 发表于：arXiv (Cornell University) · 年份：2025 · 研究领域：Galaxies: Formation, Evolution, Phenomena、Astronomy and Astrophysical Research、Gamma-ray bursts and supernovae

The effective redshift distribution $n(z)$ of galaxies is a critical component in the study of weak gravitational lensing. Here, we introduce a new method for determining $n(z)$ for weak lensing surveys based on high-quality redshifts and neural network-based importance weights. Additionally, we present the first unified photometric redshift calibration of the three leading stage-III weak lensing surveys, the Dark Energy Survey (DES), the Hyper Suprime-Cam (HSC) survey and the Kilo-Degree Survey (KiDS), with state-of-the-art spectroscopic data from the Dark Energy Spectroscopic Instrument (DESI). We verify our method using a new, data-driven approach and obtain $n(z)$ constraints with statistical uncertainties of order $σ_{\bar z} \sim 0.01$ and smaller. Our analysis is largely independent of previous photometric redshift calibrations and, thus, provides an important cross-check in light of recent cosmological tensions. Overall, we find excellent agreement with previously published results on the DES Y3 and HSC Y1 data sets while there are some differences on the mean redshift with respect to the previously published KiDS-1000 results. We attribute the latter to mismatches in photometric noise properties in the COSMOS field compared to the wider KiDS SOM-gold catalog. At the same time, the new $n(z)$ estimates for KiDS do not significantly change estimates of cosmic structure growth from cosmic shear. Finally, we discuss how our method can be applied to future weak lensing ca...