The third data release of the Kilo-Degree Survey and associated data products
The third data release of the Kilo-Degree Survey and associated data products
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DOI：
10.1051/0004-6361/201730747
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发表时间：
2017-03
影响因子：
6.5
通讯作者：
J. D. Jong;G. V. Kleijn;T. Erben;H. Hildebrandt;K. Kuijken;G. Sikkema;M. Brescia;Maciej Bilicki;N. Napolitano;V. Amaro;K. Begeman;D. Boxhoorn;H. Buddelmeijer;S. Cavuoti;Fedor I. Getman;A. Grado;E. Helmich;Z. Huang;N. Irisarri;F. L. Barbera;G. Longo;J. McFarland;R. Nakajima;M. Paolillo;E. Puddu;M. Radovich;A. Rifatto;Crescenzo Tortora;E. Valentijn;C. Vellucci;W. Vriend;A. Amon;C. Blake;A. Choi;I. F. Conti;R. Herbonnet;C. Heymans;H. Hoekstra;D. Klaes;J. Merten;L. Miller;P. Schneider;M. Viola
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文献类型：
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作者：
J. D. Jong;G. V. Kleijn;T. Erben;H. Hildebrandt;K. Kuijken;G. Sikkema;M. Brescia;Maciej Bilicki;N. Napolitano;V. Amaro;K. Begeman;D. Boxhoorn;H. Buddelmeijer;S. Cavuoti;Fedor I. Getman;A. Grado;E. Helmich;Z. Huang;N. Irisarri;F. L. Barbera;G. Longo;J. McFarland;R. Nakajima;M. Paolillo;E. Puddu;M. Radovich;A. Rifatto;Crescenzo Tortora;E. Valentijn;C. Vellucci;W. Vriend;A. Amon;C. Blake;A. Choi;I. F. Conti;R. Herbonnet;C. Heymans;H. Hoekstra;D. Klaes;J. Merten;L. Miller;P. Schneider;M. Viola
语境。千度巡天 (KiDS) 是一项持续进行的光学宽视场成像巡天，使用 VLT 巡天望远镜上的 OmegaCAM 相机进行。它的目标是在四个滤波器 (ugri) 中成像 1500 平方度。核心科学驱动力是利用弱透镜剪切和光度红移测量来绘制宇宙中大规模物质分布图。进一步的科学案例包括星系演化、银河系结构、高红移星团的探测以及寻找强透镜和类星体等稀有来源。目标。在这里，我们介绍了第三次公开数据发布和几个相关的数据产品，在前两次发布的基础上添加了更多面积、均匀光度校准、光度红移和弱透镜剪切测量。方法。嵌入 Astro-WISE 信息系统的专用管道用于主要版本的制作。详细描述了对早期版本的修改。光度红移是使用贝叶斯模板拟合和机器学习技术得出的。对于弱透镜测量，使用基于 THELI 数据缩减和 Lensfit 剪切测量包的优化程序。结果。在第三次数据发布中，另外提供了 292 个新的测量图块（大约 300 度(2)）堆叠的 ugri 图像，并附有权重图、掩模和源列表。多波段目录，包括均质光度测量和光度红移，涵盖 440 个测量图块 (44 deg2) 的组合 DR1、DR2 和 DR3 足迹。 ugri 中的极限星等通常分别为 24.3、25.1、24.9、23.8（2 0 0 孔径中的 5 英寸），典型的 r 波段 PSF 大小小于 0.7 0 0。光度均匀化方案可确保准确的颜色和稳定的绝对校准，gri 约为 2%，u 约为 3%。迄今为止，针对所有 KiDS 版本的组合区域分别发布了基于两种不同机器学习技术的弱透镜剪切目录和光度红移。
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 (approximate to 300 deg(2)) 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 (5 '' in a 2 0 0 aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.7 0 0. The photometric homogenization scheme ensures accurate colours and an absolute calibration stable to approximate to 2% for gri and approximate to 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.