TY - JOUR
T1 - The third data release of the Kilo-Degree Survey and associated data products
AU - De Jong, Jelte T.A.
AU - Verdoes Kleijn, Gijs A.
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
N1 - Publisher Copyright:
© ESO 2017.
PY - 2017
Y1 - 2017
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 20″ aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.70″. 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 20″ aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.70″. 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 - Catalogs
KW - Surveys
KW - Techniques: image processing
KW - Techniques: photometric
UR - http://www.scopus.com/inward/record.url?scp=85028420464&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85028420464&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201730747
DO - 10.1051/0004-6361/201730747
M3 - Article
AN - SCOPUS:85028420464
SN - 0004-6361
VL - 604
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A134
ER -