The first and second data releases of the Kilo-Degree Survey-猫眼课题宝

DOI：

10.1051/0004-6361/201526601

发表时间：

2015-07

期刊：

Astronomy and Astrophysics

影响因子：

6.5

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

J. D. Jong;G. V. Kleijn;D. Boxhoorn;H. Buddelmeijer;M. Capaccioli;Fedor I. Getman;A. Grado;E. Helmich;Zhuoyi Huang;N. Irisarri;K. Kuijken;F. L. Barbera;J. McFarland;N. Napolitano;M. Radovich;G. Sikkema;E. Valentijn;K. Begeman;M. Brescia;S. Cavuoti;A. Choi;O. Cordes;G. Covone;M. Dall’ora;H. Hildebrandt;G. Longo;R. Nakajima;M. Paolillo;E. Puddu;A. Rifatto;Crescenzo Tortora;E. V. Uitert;Axel Buddendiek;J. Harnois-D'eraps;T. Erben;M. Eriksen;C. Heymans;H. Hoekstra;B. Joachimi;T. Kitching;D. Klaes;L. Koopmans;F. Kohlinger;N. Roy;C. Sifón;P. Schneider;W. Sutherland;M. Viola;W. Vriend

上下文Kilo-Degree Survey（KiDS）是一种宽视场光学成像测量，使用VLT巡天望远镜和OmegaCAM相机进行。KiDS将在四个滤光片（ugri）中成像1500平方度，并与其近红外对应物维京海盗一起在九个波段中产生深度测光。设计用于弱透镜形状和光度红移测量，其核心科学驱动程序是将宇宙中的大尺度物质分布映射回~0.5的红移。次要的科学案例包括星系演化、银河系结构、高红移星团和类星体的探测。KiDS是ESO的一项公共调查，致力于为天文学界提供从调查数据中获得的高质量数据产品。公开发布的数据，其中前两个在这里介绍，是至关重要的，使独立确认调查的科学价值。对所取得的数据质量和初步科学利用情况进行了审查，以验证调查数据。研究方法：一个基于Astro-WISE的专用管道和数据管理系统，结合新开发的屏蔽和源分类工具，用于生产这里描述的数据产品。概述了基于这些数据产品和初步结果的科学项目。结果：对于148块测量瓷砖（约160平方度）已公布了ugri叠加图像，并附有重量图、掩模、源列表和多波段源目录。极限星等通常分别为24.3、25.1、24.9、23.8（2“孔径中为5σ），典型的r波段PSF尺寸小于0.7”。在全局均匀化之前的测光在gri（u）中稳定在~2%（4%）水平，由于非测光条件而具有一些离群值，而天体测量显示典型的2D rms为0.03“。早期的科学成果包括探测到9个高z类星体，15个候选的强引力透镜，高质量的光度红移和数十万个星系的结构参数。

Context. The Kilo-Degree Survey (KiDS) is an optical wide-field imaging survey carried out with the VLT Survey Telescope and the OmegaCAM camera. KiDS will image 1500 square degrees in four filters (ugri), and together with its near-infrared counterpart VIKING will produce deep photometry in nine bands. Designed for weak lensing shape and photometric redshift measurements, its core science driver is mapping the large-scale matter distribution in the Universe back to a redshift of ~0.5. Secondary science cases include galaxy evolution, Milky Way structure, and the detection of high-redshift clusters and quasars. Aims: KiDS is an ESO Public Survey and dedicated to serving the astronomical community with high-quality data products derived from the survey data. Public data releases, the first two of which are presented here, are crucial for enabling independent confirmation of the survey's scientific value. The achieved data quality and initial scientific utilization are reviewed in order to validate the survey data. Methods: A dedicated pipeline and data management system based on Astro-WISE, combined with newly developed masking and source classification tools, is used for the production of the data products described here. Science projects based on these data products and preliminary results are outlined. Results: For 148 survey tiles (≈160 sq.deg.) stacked ugri images have been released, accompanied by weight maps, masks, source lists, and a multi-band source catalogue. 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 photometry prior to global homogenization is stable at the ~2% (4%) level in gri (u) with some outliers due to non-photometric conditions, while the astrometry shows a typical 2D rms of 0.03''. Early scientific results include the detection of nine high-z QSOs, fifteen candidate strong gravitational lenses, high-quality photometric redshifts and structural parameters for hundreds of thousands of galaxies.

The first and second data releases of the Kilo-Degree Survey

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