The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees
K. Kuijken (1), C. Heymans (2), A. Dvornik (1), H. Hildebrandt (3,4),, J.T.A. de Jong (5), A.H. Wright (4), T. Erben (4), M. Bilicki (1,6), B., Giblin (2), H.-Y. Shan (4,7), F. Getman (8), A. Grado (8), H. Hoekstra (1),, L. Miller (9), N. Napolitano (10,8), M. Paolilo (11)
TL;DR
The fourth data release of the KiDS survey provides extensive ugri imaging and nine-band optical-IR photometry over 1000 square degrees, supporting weak lensing and large-scale structure studies with high-quality calibrated data.
Contribution
This release doubles the sky coverage of previous data, integrates VIKING near-infrared photometry, and details pipeline improvements for high-precision weak lensing analysis.
Findings
Over 1000 square degrees of imaging data released
Photometry calibrated to Gaia DR2 G band for accuracy
High-quality imaging with mean seeing of 0.70"
Abstract
The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at the VLT Survey Telescope, specifically designed for measuring weak gravitational lensing by galaxies and large-scale structure. When completed it will consist of 1350 square degrees imaged in four filters (ugri). Here we present the fourth public data release which more than doubles the area of sky covered by data release 3. We also include aperture-matched ZYJHKs photometry from our partner VIKING survey on the VISTA telescope in the photometry catalogue. We illustrate the data quality and describe the catalogue content. Two dedicated pipelines are used for the production of the optical data. The Astro-WISE information system is used for the production of co-added images in the four survey bands, while a separate reduction of the r-band images using the theli pipeline is used to…
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