# Dark Energy Survey Year 3 Results: Deep Field Optical + Near-Infrared Images and Catalogue

Published in arXiv, 2020

Recommended citation: Hartley, W. G., Choi, A., Amon, A., et al. 2020, submitted to MNRAS https://arxiv.org/abs/2012.12824

Dark Energy Survey (DES) Deep Fields refer to a set of images and associated multi-wavelength catalogue ($ugrizJHKs$) built from Dark Energy Camera (DECam) and Visible and Infrared Survey Telescope for Astronomy (VISTA) data. After masking, we have 5.88 square degrees with an $i$-band depth of 26.75 (AB, $10-\sigma$, 2”) and 1.6 million detected objects. These serve as inputs into the DES photometric redshift estimation (described in Myles, Alarcon et al.) as well as image simulation efforts (see Everett et al. and MacCrann et al.).

I developed the part of the pipeline combining the near-IR images with the optical images in preparation for the photometry measurements, including the estimation of the point spread function models. I also conducted or contributed to a wide range of the validation tests and wrote several sections in the paper.