Dark Energy Year 3 Results deep field - K Romer Apr 2022.pdf (6.71 MB)
Dark Energy Survey Year 3 Results: Deep Field optical + near-infrared images and catalogue
journal contribution
posted on 2023-06-10, 03:10 authored by W G Hartley, A Choi, A Amon, R A Gruendl, E Sheldon, I Harrison, G M Bernstein, I Sevilla-Noarbe, B Yanny, K Eckert, H T Diehl, A Alarcon, Sunayana Bhargava, Kathy RomerKathy Romer, Reese WilkinsonReese Wilkinson, DES Collaboration, othersWe 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, 10s, 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.
History
Publication status
- Published
File Version
- Accepted version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
3Volume
509Page range
3547-3579Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2022-04-20First Open Access (FOA) Date
2022-04-20First Compliant Deposit (FCD) Date
2022-04-13Usage metrics
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