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 similar to 137 million objects detected in co-added images covering similar to 1800 deg(2) in the DES grizY filters. The 10 sigma 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 less than or similar to 1.
Drlica-Wagner, A., et al. "Dark Energy Survey Year 1 Results: The Photometric Data Set for Cosmology." The Astrophysical Journal. Supplement Series (Online), vol. 235, no. 2, Mar. 2018. https://doi.org/10.3847/1538-4365/aab4f5
Drlica-Wagner, A., Sevilla-Noarbe, I., Rykoff, E. S., Gruendl, R. A., Yanny, B., Tucker, D. L., Hoyle, B., Rosell, A. Carnero, Bernstein, G. M., Bechtol, K., Becker, M. R., Benoit-Lévy, A., Bertin, E., Kind, M. Carrasco, Davis, C., Vicente, J. de, Diehl, H. T., Gruen, D., ... Zuntz, J. (2018). Dark Energy Survey Year 1 Results: The Photometric Data Set for Cosmology. The Astrophysical Journal. Supplement Series (Online), 235(2). https://doi.org/10.3847/1538-4365/aab4f5
Drlica-Wagner, A., Sevilla-Noarbe, I., Rykoff, E. S., et al., "Dark Energy Survey Year 1 Results: The Photometric Data Set for Cosmology," The Astrophysical Journal. Supplement Series (Online) 235, no. 2 (2018), https://doi.org/10.3847/1538-4365/aab4f5
@article{osti_1476718,
author = {Drlica-Wagner, A. and Sevilla-Noarbe, I. and Rykoff, E. S. and Gruendl, R. A. and Yanny, B. and Tucker, D. L. and Hoyle, B. and Rosell, A. Carnero and Bernstein, G. M. and Bechtol, K. and others},
title = {Dark Energy Survey Year 1 Results: The Photometric Data Set for Cosmology},
annote = {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 similar to 137 million objects detected in co-added images covering similar to 1800 deg(2) in the DES grizY filters. The 10 sigma 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 less than or similar to 1.},
doi = {10.3847/1538-4365/aab4f5},
url = {https://www.osti.gov/biblio/1476718},
journal = {The Astrophysical Journal. Supplement Series (Online)},
issn = {ISSN 1538-4365},
number = {2},
volume = {235},
place = {United States},
publisher = {American Astronomical Society/IOP},
year = {2018},
month = {03}}