KiDS+VIKING-450: A new combined optical and near-infrared dataset for cosmology and astrophysics
KiDS+VIKING-450: A new combined optical and near-infrared dataset for cosmology and astrophysics
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DOI：
10.1051/0004-6361/201834879
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发表时间：
2018-12
影响因子：
6.5
通讯作者：
A. Wright;H. Hildebrandt;K. Kuijken;T. Erben;R. Blake;H. Buddelmeijer;A. Choi;N. Cross;J. D.
中科院分区：
文献类型：
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作者：
A. Wright;H. Hildebrandt;K. Kuijken;T. Erben;R. Blake;H. Buddelmeijer;A. Choi;N. Cross;J. D.
我们提出了一个新的组合光学和近红外数据集的宇宙学和天体物理学的策展和验证，来自相结合的ugri波段成像从千度调查（KiDS）和ZYJHKs波段成像从VISTA千度红外星系（维京海盗）调查。这个数据集在宇宙学成像调查中是无与伦比的，因为它的面积（掩蔽前为458 deg 2），深度（r ≤ 25）和波长覆盖范围（ugriZYJHKs）。这种调查深度，面积和（最重要的）波长覆盖范围的组合允许显着减少系统的不确定性（即减少10%和60%之间的偏差，离群值率，和散射）在光度到光谱红移比较，相比，在光-Z以上的光-Z的情况下。我们的光学和近红外调查之间的互补性意味着，在所有photo-z中，超过80%的来源在我们的八个最红波段中具有显著的检测（即不是上限）。我们已经推导出测光，photo-z和恒星质量的调查中的所有来源，并验证这些数据产品对现有的光谱星系样本。我们证明了我们的更高层次的数据产品的保真度，通过构建调查恒星质量函数在八个体积完整的红移箱。我们发现，这些光度导出的质量函数提供了很好的协议与以前的质量演化研究使用光谱调查。本文介绍的主要数据产品通过KiDS调查网站公开提供。
We present the curation and verification of a new combined optical and near infrared dataset for cosmology and astrophysics, derived by combining ugri-band imaging from the Kilo-Degree Survey (KiDS) and ZYJHKs-band imaging from the VISTA Kilo degree Infrared Galaxy (VIKING) survey. This dataset is unrivaled in cosmological imaging surveys due to the combination of its area (458 deg2 before masking), depth (r ≤ 25), and wavelength coverage (ugriZYJHKs). This combination of survey depth, area, and (most importantly) wavelength coverage allows significant reductions in systematic uncertainties (i.e. reductions of between 10% and 60% in bias, outlier rate, and scatter) in photometric-to-spectroscopic redshift comparisons, compared to the optical-only case at photo-z above 0.7. The complementarity between our optical and near infrared surveys means that over 80% of our sources, across all photo-z, have significant detections (i.e. not upper limits) in our eight reddest bands. We have derived photometry, photo-z, and stellar masses for all sources in the survey, and verified these data products against existing spectroscopic galaxy samples. We demonstrate the fidelity of our higher-level data products by constructing the survey stellar mass functions in eight volume-complete redshift bins. We find that these photometrically derived mass functions provide excellent agreement with previous mass evolution studies derived using spectroscopic surveys. The primary data products presented in this paper are made publicly available through the KiDS survey website.