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

/ Authors

W. Hartley, A. Choi, A. Amon, R. Gruendl, E. Sheldon, I. Harrison, G. Bernstein, I. Sevilla-Noarbe, B. Yanny, K. Eckert

and 226 more authors

H. Diehl, A. Alarcon, M. Banerji, K. Bechtol, R. Buchs, S. Cantu, C. Conselice, J. Cordero, C. Davis, T. Davis, S. Dodelson, A. Drlica-Wagner, S. Everett, A. Fert'e, D. Gruen, K. Honscheid, M. Jarvis, M. Johnson, N. Kokron, N. MacCrann, J. Myles, A. Pace, A. Palmese, F. Paz-Chinch'on, M. Pereira, A. Plazas, J. Prat, M. Rodriguez-Monroy, E. Rykoff, S. Samuroff, C. S'anchez, L. Secco, F. Tarsitano, A. Tong, M. Troxel, Z. Vasquez, K. Wang, C. Zhou, T. Abbott, M. Aguena, S. Allam, J. Annis, D. Bacon, E. Bertin, S. Bhargava, D. Brooks, D. Burke, A. Rosell, M. Kind, J. Carretero, F. Castander, M. Costanzi, M. Crocce, L. Costa, J. Vicente, J. DeRose, S. Desai, J. Dietrich, T. Eifler, J. Elvin-Poole, I. Ferrero, B. Flaugher, P. Fosalba, J. Garc'ia-Bellido, E. Gaztañaga, D. Gerdes, J. Gschwend, G. Gutiérrez, S. Hinton, D. Hollowood, D. Huterer, D. James, S. Kent, E. Krause, K. Kuehn, N. Kuropatkin, O. Lahav, H. Lin, M. Maia, M. March, J. Marshall, P. Martini, Peter Melchior, F. Menanteau, R. Miquel, J. Mohr, R. Morgan, E. Neilsen, R. Ogando, S. Pandey, A. Romer, A. Roodman, M. Sako, E. Sánchez, V. Scarpine, S. Serrano, M. Smith, M. Soares-Santos, E. Suchyta, M. Swanson, G. Tarlé, D. Thomas, C. To, T. Varga, A. Walker, W. Wester, R. Wilkinson, J. Z. D. D. P. Th'eorique, Center for Astroparticle Physics, U. Geneve, Center for Particle Cosmology, A. Physics, T. O. S. University, Kavli Institute for Astrophysics, Cosmology Stanford University, D. O. Astronomy, U. I. Urbana-Champaign, National Center for Supercomputing Applications, Urbana, Il, B. N. Laboratory, D. Physics, U. Oxford, J. B. C. F. Astrophysics, S. O. Physics, Astronomy, U. Manchester, U. Pennsylvania, Centro de Investigaciones Energ'eticas, Medioambientales y Tecnol'ogicas, Madrid, Spain., F. N. Laboratory, A. N. Laboratory, I. O. Astronomy, U. Cambridge, Kavli Institute for Cosmology, P. Department, U. Wisconsin--Madison, S. N. Laboratory, P. George, C. M. S. I. F. T. Physics, Texas A M University, U. Nottingham, S. O. Mathematics, Physics, U. Queensland, C. University, Astrophysics, U. Chicago, K. I. F. T. Physics, Santa Cruz Institute for Particle Physics, Jet propulsion Laboratory, C. I. O. Technology., Stanford University, D. O. Mathematics, T. Physics, U. Michigan, D. Sciences, P. University., E. Zurich, D. University, Cerro Tololo Inter-American Observatory, NSF's National Optical-Infrared Astronomy Research Laboratory, Departamento de F'isica Matem'atica, I. D. F'isica, U. S. Paulo, L. LIneA, Institute of Cosmology, Gravitation, U. Portsmouth, Cnrs, Umr 7095, I. D. Paris, Sorbonne Universit'es, 06 UPMCUnivParis, Pevensey Building, U. Sussex, D. O. Astronomy, U. London, Instituto de Astrof'isica de Canarias, U. L. Laguna, Dpto. Astrofisica, Institut de F'isica d'Altes Energies, T. Z. F. O. Science, Technology, Campus Uab, I. D. E. D. Catalunya, Institute of Space Sciences, Inaf Trieste, Institute for Fundamental Physics of the Universe, O. Nacional, R. Janeiro, Brazil, U. California, Berkeley, Iit Hyderabad, F. O. Physics, Ludwig-Maximilians-Universitat, Department of AstronomySteward Observatory, U. Arizona, I. Astrophysics, U. Oslo, Instituto de Fisica Teorica Uamcsic, U. A. D. Madrid, Center for Computational Astrophysics, HarvardSmithsonian, Australian Astronomical Optics, Macquarie University, L. Observatory, Flagstaff, Az, Radcliffe Institute for Advanced Study, Harvard University, I. C. D. R. I. E. Avanccats, M. F. P. Physics, Giessenbachstrasse, U. Southampton, Computer Science, M. Division, Oak Ridge National Laboratory, Universitats-Sternwarte, F. Physik, Ludwig-Maximilians-Universitat Munchen, Institute for Astronomy, U. Edinburgh

/ Abstract

We describe the Dark Energy Survey (DES) Deep Fields, 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. The DES Deep Fields comprise 11 fields (10 DES supernova fields plus COSMOS), with a total area of $\sim30~$ square degrees in $ugriz$ bands and reaching a maximum $i$-band depth of 26.75 (AB, $10\sigma$, 2 arcsec). We present a catalogue for the DES 3-year 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 $r=25.7, i=25, z=24.3$ 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 (${\rm NMAD} = 0.023$ 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-year weak lensing and galaxy clustering cosmology work.

DOI: 10.1093/mnras/stab3055