The Dark Energy Survey Data Release 2

  title={The Dark Energy Survey Data Release 2},
  author={Des Collaboration and T. M. C. Abbott and M. Adam{\'o}w and Michel Aguena and Sahar Allam and A. Amon and James T. Annis and Santiago {\'A}vila and David Bacon and Manda Banerji and Keith C. Bechtol and Matthew Becker and Gary M. Bernstein and Emmanuel Bertin and S. Bhargava and Sarah Bridle and David Brooks and David L. Burke and Aurelio Carnero Rosell and Matias Carrasco Kind and Jorge Carretero and Francisco J. Castander and R. Cawthon and C. L. Chang and Ami Choi and Christopher J. Conselice and M. Costanzi and Mart{\'i}n Crocce and Luiz Nicolaci da Costa and Tamara M. Davis and Juan de Vicente and Joseph DeRose and Shantanu Desai and H. Thomas Diehl and J. P. Dietrich and Alex Drlica-Wagner and Kathleen D. Eckert and J. Elvin-Poole and S. Everett and August E. Evrard and I. Ferrero and Agnes Fert'e and Brenna L. Flaugher and Pablo Fosalba and Douglas N. Friedel and Joshua A. Frieman and Juan Garc'ia-Bellido and L. Gelman and David W. Gerdes and T. Giannantonio and Mandeep S. S. Gill and Daniel Gruen and Robert A. Gruendl and Julia Gschwend and Gaston R. Guti{\'e}rrez and William G. Hartley and Samuel R. Hinton and Devon L. Hollowood and Klaus Honscheid and D. Huterer and David J. James and Tesla E. Jeltema and M. D. Johnson and S. Kent and Richard G. Kron and Kyler W. Kuehn and Nickolai Kuropatkin and Ofer Lahav and T. S. Li and Christopher E. Lidman and H. Lin and Niall MacCrann and Marcio A. G. Maia and Teddy Manning and M March and Jennifer L. Marshall and Paul Martini and Peter Melchior and Felipe Menanteau and Ramon Miquel and Robert Morgan and Justin Myles and Eric H. Neilsen and R. L. C. Ogando and Antonella Palmese and F. Paz-Chinch'on and Don Petravick and A. Pieres and Andreas Alejandro Plazas and Cody Pond and Mario Rodr{\'i}guez-Monroy and A. K. Romer and Aaron Roodman and Eli S. Rykoff and Masao Sako and Eusebio S{\'a}nchez and Bas{\'i}lio Xavier Santiago and Santiago Serrano and Ignacio Sevilla-Noarbe and J. Allyn Smith and M. Smith and Marcelle Soares-Santos and Eric Suchyta and Mollye E. C. Swanson and Gregory G. Tarl{\'e} and D. Thomas and C. To and P.-E. Tremblay and Michael Troxel and Douglas L. Tucker and D. Turner and T. N. Varga and Alistair R. Walker and Risa H. Wechsler and Jochen Weller and W. C. Iii Wester and R. D. Wilkinson and Brian Yanny and Y. Zhang and Robert Nikutta and Mike Fitzpatrick and Alice Jacques and Adam Scott and Knut A. G. Olsen and L. H. Huang and David Herrera and St{\'e}phanie Juneau and David L. Nidever and Benjamin Alan Weaver and C. Adean and Virginia Ragoni de Moraes Correia and M. de Freitas and Franciane Freitas and C. Singulani and G. C. Vila-Verde},
  journal={The Astrophysical Journal Supplement Series},
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… 
The Space Density of Ultra-luminous QSOs at the End of Reionization Epoch by the QUBRICS Survey and the AGN Contribution to the Hydrogen Ionizing Background
Motivated by evidences favoring a rapid and late hydrogen reionization process completing at z ∼ 5.2–5.5 and mainly driven by rare and luminous sources, we have reassessed the estimate of the space
Zwicky Transient Facility and Globular Clusters: The RR Lyrae gri-band Period–Luminosity–Metallicity and Period–Wesenheit–Metallicity Relations
Based on time-series observations collected from the Zwicky Transient Facility (ZTF), we derived period–luminosity–metallicity (PLZ) and period–Wesenheit–metallicity (PWZ) relations for RR Lyrae
A Mock Catalog of Gravitationally-lensed Quasars for the LSST Survey
We present a mock catalog of gravitationally-lensed quasars at z qso < 7.5 with simulated images for the Rubin Observatory Legacy Survey of Space and Time (LSST). We adopt recent measurements of
A Search of the Full Six Years of the Dark Energy Survey for Outer Solar System Objects
We present a search for outer solar system objects in the 6 yr of data from the Dark Energy Survey (DES). The DES covered a contiguous 5000 deg2 of the southern sky with ≈80,000 3 deg2 exposures in
Constraining the Hubble constant to a precision of about 1% using multi-band dark standard siren detections
Liang-Gui Zhu, 2 Ling-Hua Xie, Yi-Ming Hu, 2, ∗ Shuai Liu, 2, † En-Kun Li, 2, ‡ Nicola R. Napolitano, Bai-Tian Tang, Jian-dong Zhang, 2 and Jianwei Mei 2 School of Physics and Astronomy, Sun Yat-sen
DeepZipper: A Novel Deep-learning Architecture for Lensed Supernovae Identification
Large-scale astronomical surveys have the potential to capture data on large numbers of strongly gravitationally lensed supernovae (LSNe). To facilitate timely analysis and spectroscopic follow-up
From the Fire: A Deeper Look at the Phoenix Stream
We use 6 yr of data from the Dark Energy Survey to perform a detailed photometric characterization of the Phoenix stellar stream, a 15° long, thin, dynamically cold, low-metallicity stellar system in
The Complexity of the Cetus Stream Unveiled from the Fusion of STREAMFINDER and StarGO
We combine the power of two stream-searching tools, STREAMFINDER and StarGO applied to the Gaia EDR3 data, to detect stellar debris belonging to the Cetus stream system that forms a complex, nearly
The Dark Energy Survey Bright Arcs Survey: Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey 5000 Square Degree Footprint
This catalog will be of use for selecting interesting systems for detailed follow up, studies of galaxy cluster and group mass profiles, as well as a training/validation set for automated strong-lens searches.


The Dark Energy Survey and Operations: Year 6 – The Finale
The Dark Energy Survey (DES) is an optical and near-infrared imaging survey aimed at understanding the accelerating expansion of the universe using four complementary methods: weak gravitational
Dark Energy Survey’s Observation Strategy, Tactics, and Exposure Scheduler
The significant corpus of DES data indicates that the simple scaling relations for seeing as a function of wavelength and airmass derived from the Kolmogorov turbulence model work adequately for exposure planning purposes: deviations from these relations are modest in comparison with short time-scale seeing variations.
for the
Although kernel methods efficiently use feature combinations without computing them directly, they do not scale well with the size of the training dataset. Factorization machines (FMs) and related
Calculating efficiencies and their uncertainties
The commonly used methods for the calculation of the statistical uncertainties in cut efficiencies (''Poisson'' and ''binomial'' errors) are both defective, as is seen in extreme cases. A method for
Hierarchical Data Format
Hierarchical Data Format (HDF) is a data file format designed by the National Center for Supercomputing Applications (NCSA) to assist users in the storage and manipulation of scientific data across
SWarp: Resampling and Co-adding FITS Images Together
Dark Energy Survey Year 3 Results: Photometric Data Set for Cosmology
We describe the Dark Energy Survey (DES) photometric data set assembled from the first three years of science operations to support DES Year 3 cosmologic analyses, and provide usage notes aimed at
Data Lab - A community science platform
New Grids of Pure-hydrogen White Dwarf NLTE Model Atmospheres and the HST/STIS Flux Calibration
Non-local Thermodynamic Equilibrium (NLTE) calculations of hot white dwarf (WD) model atmospheres are the cornerstone of modern flux calibrations for the Hubble Space Telescope (HST) and for the