The third data release of the Kilo-Degree Survey and associated data products

Jelte T. A. de Jong; Gijs A. Verdoes Kleijn; Thomas Erben; Hendrik Hildebrandt; Konrad Kuijken; Gert Sikkema; Massimo Brescia; Maciej Bilicki; Nicola R. Napolitano; Valeria Amaro; Kor G. Begeman; Danny R. Boxhoorn; Hugo Buddelmeijer; Stefano Cavuoti; Fedor Getman; Aniello Grado; Ewout Helmich; Zhuoyi Huang; Nancy Irisarri; Francesco La Barbera; Giuseppe Longo; John P. McFarland; Reiko Nakajima; Maurizio Paolillo; Emanuella Puddu; Mario Radovich; Agatino Rifatto; Crescenzo Tortora; Edwin A. Valentijn; Civita Vellucci; Willem-Jan Vriend; Alexandra Amon; Chris Blake; Ami Choi; Ian Fenech Conti; Stephen D. J. Gwyn; Ricardo Herbonnet; Catherine Heymans; Henk Hoekstra; Dominik Klaes; Julian Merten; Lance Miller; Peter Schneider; Massimo Viola

doi:10.1051/0004-6361/201730747

The third data release of the Kilo-Degree Survey and associated data products

Jelte T. A. de Jong, Gijs A. Verdoes Kleijn, Thomas Erben, Hendrik Hildebrandt, Konrad Kuijken, Gert Sikkema, Massimo Brescia, Maciej Bilicki, Nicola R. Napolitano, Valeria Amaro, Kor G. Begeman, Danny R. Boxhoorn, Hugo Buddelmeijer, Stefano Cavuoti, Fedor Getman, Aniello Grado, Ewout Helmich, Zhuoyi Huang, Nancy Irisarri, Francesco La BarberaGiuseppe Longo, John P. McFarland, Reiko Nakajima, Maurizio Paolillo, Emanuella Puddu, Mario Radovich, Agatino Rifatto, Crescenzo Tortora, Edwin A. Valentijn, Civita Vellucci, Willem-Jan Vriend, Alexandra Amon, Chris Blake, Ami Choi, Ian Fenech Conti, Stephen D. J. Gwyn, Ricardo Herbonnet, Catherine Heymans, Henk Hoekstra, Dominik Klaes, Julian Merten, Lance Miller, Peter Schneider, Massimo Viola

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

Context. The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at the VLT Survey Telescope. It aims to image 1500 square degrees in four filters (ugri). The core science driver is mapping the large-scale matter distribution in the Universe, using weak lensing shear and photometric redshift measurements. Further science cases include galaxy evolution, Milky Way structure, detection of high-redshift clusters, and finding rare sources such as strong lenses and quasars. Aims: Here we present the third public data release and several associated data products, adding further area, homogenized photometric calibration, photometric redshifts and weak lensing shear measurements to the first two releases. Methods: A dedicated pipeline embedded in the Astro-WISE information system is used for the production of the main release. Modifications with respect to earlier releases are described in detail. Photometric redshifts have been derived using both Bayesian template fitting, and machine-learning techniques. For the weak lensing measurements, optimized procedures based on the THELI data reduction and lensfit shear measurement packages are used. Results: In this third data release an additional 292 new survey tiles (≈300 deg2) stacked ugri images are made available, accompanied by weight maps, masks, and source lists. The multi-band catalogue, including homogenized photometry and photometric redshifts, covers the combined DR1, DR2 and DR3 footprint of 440 survey tiles (44 deg2). Limiting magnitudes are typically 24.3, 25.1, 24.9, 23.8 (5σ in a 2'' aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.7''. The photometric homogenization scheme ensures accurate colours and an absolute calibration stable to ≈2% for gri and ≈3% in u. Separately released for the combined area of all KiDS releases to date are a weak lensing shear catalogue and photometric redshifts based on two different machine-learning techniques.

Original language	English
Journal	Astronomy & Astrophysics
Volume	604
DOIs	https://doi.org/10.1051/0004-6361/201730747
Publication status	Published - 21 May 2017

Keywords / Materials (for Non-textual outputs)

surveys
catalogs
techniques: photometric
techniques: image processing

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10.1051/0004-6361/201730747

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de Jong, J. T. A., Kleijn, G. A. V., Erben, T., Hildebrandt, H., Kuijken, K., Sikkema, G., Brescia, M., Bilicki, M., Napolitano, N. R., Amaro, V., Begeman, K. G., Boxhoorn, D. R., Buddelmeijer, H., Cavuoti, S., Getman, F., Grado, A., Helmich, E., Huang, Z., Irisarri, N., ... Viola, M. (2017). The third data release of the Kilo-Degree Survey and associated data products. Astronomy & Astrophysics, 604. https://doi.org/10.1051/0004-6361/201730747

@article{6d708874c8d5499b83dfc952920be8d9,

title = "The third data release of the Kilo-Degree Survey and associated data products",

abstract = "Context. The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at the VLT Survey Telescope. It aims to image 1500 square degrees in four filters (ugri). The core science driver is mapping the large-scale matter distribution in the Universe, using weak lensing shear and photometric redshift measurements. Further science cases include galaxy evolution, Milky Way structure, detection of high-redshift clusters, and finding rare sources such as strong lenses and quasars. Aims: Here we present the third public data release and several associated data products, adding further area, homogenized photometric calibration, photometric redshifts and weak lensing shear measurements to the first two releases. Methods: A dedicated pipeline embedded in the Astro-WISE information system is used for the production of the main release. Modifications with respect to earlier releases are described in detail. Photometric redshifts have been derived using both Bayesian template fitting, and machine-learning techniques. For the weak lensing measurements, optimized procedures based on the THELI data reduction and lensfit shear measurement packages are used. Results: In this third data release an additional 292 new survey tiles (≈300 deg2) stacked ugri images are made available, accompanied by weight maps, masks, and source lists. The multi-band catalogue, including homogenized photometry and photometric redshifts, covers the combined DR1, DR2 and DR3 footprint of 440 survey tiles (44 deg2). Limiting magnitudes are typically 24.3, 25.1, 24.9, 23.8 (5σ in a 2'' aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.7''. The photometric homogenization scheme ensures accurate colours and an absolute calibration stable to ≈2% for gri and ≈3% in u. Separately released for the combined area of all KiDS releases to date are a weak lensing shear catalogue and photometric redshifts based on two different machine-learning techniques.",

keywords = "surveys, catalogs, techniques: photometric, techniques: image processing",

author = "{de Jong}, {Jelte T. A.} and Kleijn, {Gijs A. Verdoes} and Thomas Erben and Hendrik Hildebrandt and Konrad Kuijken and Gert Sikkema and Massimo Brescia and Maciej Bilicki and Napolitano, {Nicola R.} and Valeria Amaro and Begeman, {Kor G.} and Boxhoorn, {Danny R.} and Hugo Buddelmeijer and Stefano Cavuoti and Fedor Getman and Aniello Grado and Ewout Helmich and Zhuoyi Huang and Nancy Irisarri and {La Barbera}, Francesco and Giuseppe Longo and McFarland, {John P.} and Reiko Nakajima and Maurizio Paolillo and Emanuella Puddu and Mario Radovich and Agatino Rifatto and Crescenzo Tortora and Valentijn, {Edwin A.} and Civita Vellucci and Willem-Jan Vriend and Alexandra Amon and Chris Blake and Ami Choi and Conti, {Ian Fenech} and Gwyn, {Stephen D. J.} and Ricardo Herbonnet and Catherine Heymans and Henk Hoekstra and Dominik Klaes and Julian Merten and Lance Miller and Peter Schneider and Massimo Viola",

year = "2017",

month = may,

day = "21",

doi = "10.1051/0004-6361/201730747",

language = "English",

volume = "604",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

de Jong, JTA, Kleijn, GAV, Erben, T, Hildebrandt, H, Kuijken, K, Sikkema, G, Brescia, M, Bilicki, M, Napolitano, NR, Amaro, V, Begeman, KG, Boxhoorn, DR, Buddelmeijer, H, Cavuoti, S, Getman, F, Grado, A, Helmich, E, Huang, Z, Irisarri, N, La Barbera, F, Longo, G, McFarland, JP, Nakajima, R, Paolillo, M, Puddu, E, Radovich, M, Rifatto, A, Tortora, C, Valentijn, EA, Vellucci, C, Vriend, W-J, Amon, A, Blake, C, Choi, A, Conti, IF, Gwyn, SDJ, Herbonnet, R, Heymans, C, Hoekstra, H, Klaes, D, Merten, J, Miller, L, Schneider, P & Viola, M 2017, 'The third data release of the Kilo-Degree Survey and associated data products', Astronomy & Astrophysics, vol. 604. https://doi.org/10.1051/0004-6361/201730747

TY - JOUR

T1 - The third data release of the Kilo-Degree Survey and associated data products

AU - de Jong, Jelte T. A.

AU - Kleijn, Gijs A. Verdoes

AU - Erben, Thomas

AU - Hildebrandt, Hendrik

AU - Kuijken, Konrad

AU - Sikkema, Gert

AU - Brescia, Massimo

AU - Bilicki, Maciej

AU - Napolitano, Nicola R.

AU - Amaro, Valeria

AU - Begeman, Kor G.

AU - Boxhoorn, Danny R.

AU - Buddelmeijer, Hugo

AU - Cavuoti, Stefano

AU - Getman, Fedor

AU - Grado, Aniello

AU - Helmich, Ewout

AU - Huang, Zhuoyi

AU - Irisarri, Nancy

AU - La Barbera, Francesco

AU - Longo, Giuseppe

AU - McFarland, John P.

AU - Nakajima, Reiko

AU - Paolillo, Maurizio

AU - Puddu, Emanuella

AU - Radovich, Mario

AU - Rifatto, Agatino

AU - Tortora, Crescenzo

AU - Valentijn, Edwin A.

AU - Vellucci, Civita

AU - Vriend, Willem-Jan

AU - Amon, Alexandra

AU - Blake, Chris

AU - Choi, Ami

AU - Conti, Ian Fenech

AU - Gwyn, Stephen D. J.

AU - Herbonnet, Ricardo

AU - Heymans, Catherine

AU - Hoekstra, Henk

AU - Klaes, Dominik

AU - Merten, Julian

AU - Miller, Lance

AU - Schneider, Peter

AU - Viola, Massimo

PY - 2017/5/21

Y1 - 2017/5/21

N2 - Context. The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at the VLT Survey Telescope. It aims to image 1500 square degrees in four filters (ugri). The core science driver is mapping the large-scale matter distribution in the Universe, using weak lensing shear and photometric redshift measurements. Further science cases include galaxy evolution, Milky Way structure, detection of high-redshift clusters, and finding rare sources such as strong lenses and quasars. Aims: Here we present the third public data release and several associated data products, adding further area, homogenized photometric calibration, photometric redshifts and weak lensing shear measurements to the first two releases. Methods: A dedicated pipeline embedded in the Astro-WISE information system is used for the production of the main release. Modifications with respect to earlier releases are described in detail. Photometric redshifts have been derived using both Bayesian template fitting, and machine-learning techniques. For the weak lensing measurements, optimized procedures based on the THELI data reduction and lensfit shear measurement packages are used. Results: In this third data release an additional 292 new survey tiles (≈300 deg2) stacked ugri images are made available, accompanied by weight maps, masks, and source lists. The multi-band catalogue, including homogenized photometry and photometric redshifts, covers the combined DR1, DR2 and DR3 footprint of 440 survey tiles (44 deg2). Limiting magnitudes are typically 24.3, 25.1, 24.9, 23.8 (5σ in a 2'' aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.7''. The photometric homogenization scheme ensures accurate colours and an absolute calibration stable to ≈2% for gri and ≈3% in u. Separately released for the combined area of all KiDS releases to date are a weak lensing shear catalogue and photometric redshifts based on two different machine-learning techniques.

AB - Context. The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at the VLT Survey Telescope. It aims to image 1500 square degrees in four filters (ugri). The core science driver is mapping the large-scale matter distribution in the Universe, using weak lensing shear and photometric redshift measurements. Further science cases include galaxy evolution, Milky Way structure, detection of high-redshift clusters, and finding rare sources such as strong lenses and quasars. Aims: Here we present the third public data release and several associated data products, adding further area, homogenized photometric calibration, photometric redshifts and weak lensing shear measurements to the first two releases. Methods: A dedicated pipeline embedded in the Astro-WISE information system is used for the production of the main release. Modifications with respect to earlier releases are described in detail. Photometric redshifts have been derived using both Bayesian template fitting, and machine-learning techniques. For the weak lensing measurements, optimized procedures based on the THELI data reduction and lensfit shear measurement packages are used. Results: In this third data release an additional 292 new survey tiles (≈300 deg2) stacked ugri images are made available, accompanied by weight maps, masks, and source lists. The multi-band catalogue, including homogenized photometry and photometric redshifts, covers the combined DR1, DR2 and DR3 footprint of 440 survey tiles (44 deg2). Limiting magnitudes are typically 24.3, 25.1, 24.9, 23.8 (5σ in a 2'' aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.7''. The photometric homogenization scheme ensures accurate colours and an absolute calibration stable to ≈2% for gri and ≈3% in u. Separately released for the combined area of all KiDS releases to date are a weak lensing shear catalogue and photometric redshifts based on two different machine-learning techniques.

KW - surveys

KW - catalogs

KW - techniques: photometric

KW - techniques: image processing

U2 - 10.1051/0004-6361/201730747

DO - 10.1051/0004-6361/201730747

M3 - Article

SN - 0004-6361

VL - 604

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

ER -

The third data release of the Kilo-Degree Survey and associated data products

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

Access to Document

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Cite this