HSC Weak Lensing Catalog Calibrated with DESI Data

This study presents a full calibration of the Hyper Suprime Camera (HSC) weak lensing catalog using data from the Dark Energy Spectroscopic Instrument (DESI). The calibration is essential for cosmological analysis of weak lensing data, which is used to map the distribution of dark matter and study the expansion of the universe. The inclusion of high-redshift sources, such as emission line galaxies (ELG) and quasars (QSO), allows for a complete calibration of all redshift bins, addressing limitations in previous HSC calibrations. The findings indicate small shifts in the tomographic redshift distributions, particularly in the higher redshift bins, but these shifts are smaller than those observed in previous cosmic shear analyses. The authors also address potential biases arising from galaxy bias and magnification effects, proposing corrections to mitigate their impact. By relaxing the assumption of linear bias and leveraging smaller clustering scales, the study aims to improve the accuracy and reliability of weak lensing measurements. The results of this calibration will be valuable for future cosmological studies using weak lensing data, enabling more precise measurements of cosmological parameters and a better understanding of the nature of dark energy. The comparison with previous analyses and other parameterizations found in the literature further strengthens the validity of the calibration and its potential impact on the field.

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