The Dark Energy Survey Data Release 2
DES Collaboration, T. M. C. Abbott, M. Adamow, M. Aguena, S. Allam, A., Amon, J. Annis, S. Avila, D. Bacon, M. Banerji, K. Bechtol, M. R. Becker, G., M. Bernstein, E. Bertin, S. Bhargava, S. L. Bridle, D. Brooks, D. L. Burke,, A. Carnero Rosell, M. Carrasco Kind, J. Carretero

TL;DR
The Dark Energy Survey Data Release 2 provides an extensive, high-precision optical/near-infrared imaging dataset covering 5000 square degrees, enabling advanced cosmological research with nearly 700 million detected objects.
Contribution
This paper introduces the second public data release of DES, offering the largest and most precise photometric dataset to date for cosmology and astrophysics research.
Findings
Includes ~691 million objects detected over 5000 deg2.
Achieves median photometric accuracy of ~10 mmag.
Provides data through multiple accessible interfaces.
Abstract
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 years 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 full-width at half maximum of g= 1.11, r= 0.95, i= 0.88, z= 0.83, and Y= 0.90 arcsec photometric uniformity with a standard deviation of < 3 mmag with respect to Gaia DR2 G-band, a photometric accuracy of ~10 mmag, and a median internal astrometric precision of ~27 mas. The median…
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