Dark Energy Survey Year 3 Results: Deep Field optical + near-infrared images and catalogue. Issue 3 (27th October 2021)

• Record Type: Journal Article
• Authors: Hartley, W G; Choi, A; Amon, A; Gruendl, R A; Sheldon, E; Harrison, I; Bernstein, G M; Sevilla-Noarbe, I; Yanny, B; Eckert, K; Diehl, H T; Alarcon, A; Banerji, M; Bechtol, K; Buchs, R; Cantu, S; Conselice, C; Cordero, J; Davis, C; Davis, T M; Dodelson, S; Drlica-Wagner, A; Everett, S; Ferté, A; Gruen, D; Honscheid, K; Jarvis, M; Johnson, M D; Kokron, N; MacCrann, N; Myles, J; Pace, A B; Palmese, A; Paz-Chinchón, F; Pereira, M E S; Plazas, A A; Prat, J; Rodriguez-Monroy, M; Rykoff, E S; Samuroff, S; Sánchez, C; Secco, L F; Tarsitano, F; Tong, A; Troxel, M A; Vasquez, Z; Wang, K; Zhou, C; Abbott, T M C; Aguena, M; Allam, S; Annis, J; Bacon, D; Bertin, E; Bhargava, S; Brooks, D; Burke, D L; Carnero Rosell, A; Carrasco Kind, M; Carretero, J; Castander, F J; Costanzi, M; Crocce, M; da Costa, L N; De Vicente, J; DeRose, J; Desai, S; Dietrich, J P; Eifler, T F; Elvin-Poole, J; Ferrero, I; Flaugher, B; Fosalba, P; García-Bellido, J; Gaztanaga, E; Gerdes, D W; Gschwend, J; Gutierrez, G; Hinton, S R; Hollowood, D L; Huterer, D; James, D J; Kent, S; Krause, E; Kuehn, K; Kuropatkin, N; Lahav, O; Lin, H; Maia, M A G; March, M; Marshall, J L; Martini, P; Melchior, P; Menanteau, F; Miquel, R; Mohr, J J; Morgan, R; Neilsen, E; Ogando, R L C; Pandey, S; Romer, A K; Roodman, A; Sako, M; Sanchez, E; Scarpine, V; Serrano, S; Smith, M; Soares-Santos, M; Suchyta, E; Swanson, M E C; Tarle, G; Thomas, D; To, C; Varga, T N; Walker, A R; Wester, W; Wilkinson, R D; Zuntz, J;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 509:Issue 3(2022)
• Page Start: 3547
• Page End: 3579
• Publication Date: 2021-10-27
• Subjects: catalogues -- surveys -- galaxies: distances and redshifts -- galaxies: evolution -- galaxies: photometry -- cosmology: observations; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab3055
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We describe the Dark Energy Survey (DES) Deep Fields, a set of images and associated multiwavelength catalogue ( ugrizJHKs ) built from Dark Energy Camera (DECam) and Visible and Infrared Survey Telescope for Astronomy (VISTA) data. The DES Deep Fields comprise 11 fields (10 DES supernova fields plus COSMOS), with a total area of ∼30 sq. deg. in ugriz bands and reaching a maximum i -band depth of 26.75 (AB, 10σ, 2 arcsec). We present a catalogue for the DES 3-yr cosmology analysis of those four fields with full 8-band coverage, totalling 5.88 sq. deg. after masking. Numbering 2.8 million objects (1.6 million post-masking), our catalogue is drawn from images coadded to consistent depths of r = 25.7, i = 25, and z = 24.3 mag. We use a new model-fitting code, built upon established methods, to deblend sources and ensure consistent colours across the u -band to Ks -band wavelength range. We further detail the tight control we maintain over the point-spread function modelling required for the model fitting, astrometry and consistency of photometry between the four fields. The catalogue allows us to perform a careful star–galaxy separation and produces excellent photometric redshift performance (NMAD = 0.023 at i < 23). The Deep-Fields catalogue will be made available as part of the cosmology data products release, following the completion of the DES 3-yr weak lensing and galaxy clustering cosmology work.