Dark Energy Survey Y6 Shape Catalog

Precise galaxy shape measurements are necessary for measuring the mass distribution in the Universe, and hence understanding the matter content and clustering amplitude of the Universe. Utilizing advanced shape measurement algorithms and rigorous systematics tests, we build galaxy shape catalogue across an effective area of more than 4,000 square degrees in the Dark Energy Survey (DES) footprint. To account for potential contamination from stars and other spurious sources, we implement state-of-the-art point spread function (PSF) modeling, image coaddition algorithms, and shape calibration technique. The resultant shape catalogue will offer unprecedented statistical power for weak gravitational lensing cosmology studies.

Figure: The number density of the shear catalogs from Science Verification (Jarvis+ 2016), Year-1 (Zuntz+ 2017), Year-3 (Gatti+ 2021) and Year-6 (Yamamoto+ 2025).