Antonella Palmese, Jack Elvin-Poole, M. Rodriguez-Monroy, David Herrera, Peter Melchior, M. Fitzpatrick, Ricardo L. C. Ogando, Alexandra Amon, J. DeRose, E. Suchyta, August E. Evrard, Pier-Emmanuel Tremblay, Jochen Weller, Don Petravick, M. Smith, H. T. Diehl, David Bacon, M. E. C. Swanson, A. R. Walker, Daniel Gruen, Alex Drlica-Wagner, Douglas L. Tucker, Kyler Kuehn, Josh Frieman, K. A. G. Olsen, Felipe Menanteau, Dragan Huterer, F. J. Castander, J. Allyn Smith, M. D. Johnson, Christopher J. Conselice, S. Everett, M. S. S. Gill, Niall MacCrann, C. Lidman, Keith Bechtol, J. Annis, W. C. Wester, J. Myles, Sunayana Bhargava, C. Adean, W. G. Hartley, D. W. Gerdes, Ramon Miquel, V. Scarpine, David L. Nidever, B. Flaugher, M. Banerji, Huan Lin, Samuel Hinton, David J. James, Jennifer L. Marshall, T. M. C. Abbott, G. Gutierrez, Enrique Gaztanaga, T. A. Manning, J. P. Dietrich, Juan Garcia-Bellido, G. Tarle, A. Choi, Pablo Fosalba, Daniel Thomas, Eric H. Neilsen, J. Carretero, Tamara M. Davis, J. De Vicente, A. Roodman, Tommaso Giannantonio, F. N. Freitas, Chun-Hao To, S. Juneau, G. Vila-Verde, K. Honscheid, Martin Crocce, E. Bertin, R. D. Wilkinson, C. Singulani, A. A. Plazas, D. L. Burke, E. J. Sanchez, Matthew R. Becker, David J. Brooks, M. A. G. Maia, C. Pond, J. Gschwend, A. K. Romer, T. N. Varga, Eli S. Rykoff, Gary Bernstein, D. J. Turner, Richard G. Kron, A. Jacques, Michael Troxel, Paul Martini, Douglas N. Friedel, M. de Freitas, B. A. Weaver, L. Huang, M. Sako, Adriano Pieres, I. Sevilla-Noarbe, Brian Yanny, A. Carnero Rosell, M. Soares-Santos, N. Kuropatkin, D. L. Hollowood, S. Serrano, S. Allam, Robert A. Gruendl, M. Carrasco Kind, K. D. Eckert, V. Correia, F. Paz-Chinchón, Tesla E. Jeltema, L. N. da Costa, M. March, Basilio X. Santiago, R. Nikutta, S. Kent, Michel Aguena, I. Ferrero, R. Cawthon, Yanxi Zhang, M. Costanzi, A. Scott, J. D. Maloney, Ofer Lahav, Monika Adamów, Risa H. Wechsler, Agnès Ferté, Tenglin Li, Sarah Bridle, Santiago Avila, L. Gelman, Robert Morgan, Chihway Chang, S. Desai, National Science Foundation (US), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Instituto Nacional de Ciência e Tecnologia (Brasil), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Linea Science Server, and DES
Abbott, T. M. C., et al. (Linea Science Server), We present the second public data release of the Dark Energy Survey, DES DR2, based on optical/near-infrared imaging by the Dark Energy Camera mounted on the 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile. DES DR2 consists of reduced single-epoch and coadded images, a source catalog derived from coadded images, and associated data products assembled from 6 yr of DES science operations. This release includes data from the DES wide-area survey covering ∼5000 deg2 of the southern Galactic cap in five broad photometric bands, grizY. DES DR2 has a median delivered point-spread function FWHM of g = 1.11″, r = 0.95″, i = 0.88″, z = 0.83″, and Y = 0.″90, photometric uniformity with a standard deviation of < 3 mmag with respect to Gaia DR2 G band, a photometric accuracy of ∼11 mmag, and a median internal astrometric precision of ∼27 mas. The median coadded catalog depth for a 1.″95 diameter aperture at signal-to-noise ratio = 10 is g = 24.7, r = 24.4, i = 23.8, z = 23.1, and Y = 21.7 mag. DES DR2 includes ∼691 million distinct astronomical objects detected in 10,169 coadded image tiles of size 0.534 deg2 produced from 76,217 single-epoch images. After a basic quality selection, benchmark galaxy and stellar samples contain 543 million and 145 million objects, respectively. These data are accessible through several interfaces, including interactive image visualization tools, web-based query clients, image cutout servers, and Jupyter notebooks. DES DR2 constitutes the largest photometric data set to date at the achieved depth and photometric precision., The DES data management system is supported by the National Science Foundation under Grant Numbers AST1138766 and AST-1536171. The DES participants from Spanish institutions are partially supported by MICINN under grants ESP2017-89838, PGC2018-094773, PGC2018-102021, SEV-2016-0588, SEV-2016-0597, and MDM-2015-0509, some of which include ERDF funds from the European Union. IFAE is partially funded by the CERCA program of the Generalitat de Catalunya. Research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program (FP7/ 2007-2013) including ERC grant agreements 240672, 291329, and 306478. We acknowledge support from the Brazilian Instituto Nacional de Ciência e Tecnologia (INCT) do e-Universo (CNPq grant 465376/2014-2).