Dark energy survey year 1 results:: the photometric data set for cosmology
Dark energy survey year 1 results:: the photometric data set for cosmology
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 $\sim 137$ million objects detected in co-added images covering $\sim 1800\,{\deg }^{2}$ 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 lesssim 1.
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Smith, Mathew
8bdc74e1-a37b-434d-ae75-82763109bf7a
Smith, Mathew
,
DES Collaboration
(2018)
Dark energy survey year 1 results:: the photometric data set for cosmology.
The Astrophysical Journal.
(doi:10.3847/1538-4365/aab4f5/meta).
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 $\sim 137$ million objects detected in co-added images covering $\sim 1800\,{\deg }^{2}$ 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 lesssim 1.
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Accepted/In Press date: 1 March 2018
e-pub ahead of print date: 3 April 2018
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Local EPrints ID: 421554
URI: http://eprints.soton.ac.uk/id/eprint/421554
ISSN: 0004-637X
PURE UUID: 24619076-cf29-405c-8b11-a9320e645ee2
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Date deposited: 15 Jun 2018 16:30
Last modified: 16 Mar 2024 04:19
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Corporate Author: DES Collaboration
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