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KiDS+VIKING-450: A new combined optical and near-infrared dataset for cosmology and astrophysics

Wright, Angus H.; Hildebrandt, Hendrik; Kuijken, Konrad; Erben, Thomas; Blake, Robert; Buddelmeijer, Hugo; Choi, Ami; Cross, Nicholas; de Jong, Jelte T.A.; Edge, Alastair; Gonzalez-Fernandez, Carlos; González Solares, Eduardo; Grado, Aniello; Heymans, Catherine; Irwin, Mike; Kupcu Yoldas, Aybuke; Lewis, James R.; Mann, Robert G.; Napolitano, Nicola; Radovich, Mario; Schneider, Peter; Sifón, Cristóbal; Sutherland, William; Sutorius, Eckhard; Verdoes Kleijn, Gijs A.

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Authors

Angus H. Wright

Hendrik Hildebrandt

Konrad Kuijken

Thomas Erben

Robert Blake

Hugo Buddelmeijer

Ami Choi

Nicholas Cross

Jelte T.A. de Jong

Carlos Gonzalez-Fernandez

Eduardo González Solares

Aniello Grado

Catherine Heymans

Mike Irwin

Aybuke Kupcu Yoldas

James R. Lewis

Robert G. Mann

Nicola Napolitano

Mario Radovich

Peter Schneider

Cristóbal Sifón

William Sutherland

Eckhard Sutorius

Gijs A. Verdoes Kleijn



Abstract

We present the curation and verification of a new combined optical and near infrared dataset for cosmology and astrophysics, derived by combining ugri-band imaging from the Kilo-Degree Survey (KiDS) and ZYJHKs-band imaging from the VISTA Kilo degree Infrared Galaxy (VIKING) survey. This dataset is unrivaled in cosmological imaging surveys due to the combination of its area (458 deg2 before masking), depth (r ≤ 25), and wavelength coverage (ugriZYJHKs). This combination of survey depth, area, and (most importantly) wavelength coverage allows significant reductions in systematic uncertainties (i.e. reductions of between 10% and 60% in bias, outlier rate, and scatter) in photometric-to-spectroscopic redshift comparisons, compared to the optical-only case at photo-z above 0.7. The complementarity between our optical and near infrared surveys means that over 80% of our sources, across all photo-z, have significant detections (i.e. not upper limits) in our eight reddest bands. We have derived photometry, photo-z, and stellar masses for all sources in the survey, and verified these data products against existing spectroscopic galaxy samples. We demonstrate the fidelity of our higher-level data products by constructing the survey stellar mass functions in eight volume-complete redshift bins. We find that these photometrically derived mass functions provide excellent agreement with previous mass evolution studies derived using spectroscopic surveys. The primary data products presented in this paper are made publicly available through the KiDS survey website.

Citation

Wright, A. H., Hildebrandt, H., Kuijken, K., Erben, T., Blake, R., Buddelmeijer, H., …Verdoes Kleijn, G. A. (2019). KiDS+VIKING-450: A new combined optical and near-infrared dataset for cosmology and astrophysics. Astronomy & Astrophysics, 632, Article A34. https://doi.org/10.1051/0004-6361/201834879

Journal Article Type Article
Acceptance Date Aug 28, 2019
Online Publication Date Nov 22, 2019
Publication Date Dec 31, 2019
Deposit Date Dec 10, 2019
Publicly Available Date Mar 28, 2024
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 632
Article Number A34
DOI https://doi.org/10.1051/0004-6361/201834879

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Copyright Statement
Wright, Angus H., Hildebrandt, Hendrik, Kuijken, Konrad, Erben, Thomas, Blake, Robert, Buddelmeijer, Hugo, Choi, Ami, Cross, Nicholas, de Jong, Jelte T. A., Edge, Alastair, Gonzalez-Fernandez, Carlos, González Solares, Eduardo, Grado, Aniello, Heymans, Catherine, Irwin, Mike, Kupcu Yoldas, Aybuke, Lewis, James R., Mann, Robert G., Napolitano, Nicola, Radovich, Mario, Schneider, Peter, Sifón, Cristóbal, Sutherland, William, Sutorius, Eckhard & Verdoes Kleijn, Gijs A. (2019). KiDS+VIKING-450: A new combined optical and near-infrared dataset for cosmology and astrophysics. Astronomy & Astrophysics 632: A34. reproduced with permission,© ESO.





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