Dark energy survey year 1 results: the photometric data set for cosmology

Drlica-Wagner, A, Sevilla-Noarbe, I, Rykoff, E S, Greundl, R A, Yanny, B, Tucker, D L, Hoyle, B, Carnero Rosell, A, Bernstein, G M, Bechtol, K, Becker, M R, Benoit-Lévy, A, Bertin, E, Carrasco Kind, M, Davis, C, de Vicente, J, Diehl, H T, Gruen, D, Hartley, W G, Leistedt, B, Li, T S, Marshall, J L, Neilsen, E, Rau, M M, Sheldon, E, Smith, J, Troxel, M A, Wyatt, S, Zhang, Y, Romer, A K and and, The DES Collaboration (2018) Dark energy survey year 1 results: the photometric data set for cosmology. Astrophysical Journal Supplement, 235 (33). ISSN 0067-0049

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Abstract

We describe the creation, content, and validation of the Dark Energy Survey (DES) internal year-one cosmology data set, Y1A1 GOLD, in support of upcoming cosmological analyses. The Y1A1 GOLD data set is assembled from multiple epochs of DES imaging and consists of calibrated photometric zero-points, object catalogs, and ancillary data products—e.g., maps of survey depth and observing conditions, star–galaxy classification, and photometric redshift estimates—that are necessary for accurate cosmological analyses. The Y1A1 GOLD wide-area object catalog consists of ~137 million objects detected in co-added images covering ~1800deg^2 in the DES grizY filters. The 10σ limiting magnitude for galaxies is g=23.4, r=23.2, i=22.5, z=21.8, and Y=20.1. Photometric calibration of Y1A1 GOLD was performed by combining nightly zero-point solutions with stellar locus regression, and the absolute calibration accuracy is better than 2% over the survey area. DES Y1A1 GOLD is the largest photometric data set at the achieved depth to date, enabling precise measurements of cosmic acceleration at z < 1.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
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Depositing User: Billy Wichaidit
Date Deposited: 15 May 2018 14:41
Last Modified: 15 May 2018 14:42
URI: http://srodev.sussex.ac.uk/id/eprint/75849

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Project NameSussex Project NumberFunderFunder Ref
University of Sussex Astronomy Consolidated Grant 2017-2020G2050STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/P000525/1