Dark Energy Survey Year 3 Results: Deep Field optical + near-infrared images and catalogue

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, Bhargava, S, Romer, A K, Wilkinson, R D, DES Collaboration, and others, (2022) Dark Energy Survey Year 3 Results: Deep Field optical + near-infrared images and catalogue. Monthly Notices of the Royal Astronomical Society, 509 (3). pp. 3547-3579. ISSN 0035-8711

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 20 Apr 2022 08:04
Last Modified: 20 Apr 2022 08:15
URI: http://sro.sussex.ac.uk/id/eprint/105334

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