KiDS-i-800: Comparing weak gravitational lensing measurements from same-sky surveys
KiDS-i-800: Comparing weak gravitational lensing measurements from same-sky surveys
复制标题
DOI：
10.1093/mnras/sty859
复制
发表时间：
2017-07
影响因子：
4.8
通讯作者：
A. Amon;C. Heymans;D. Klaes;T. Erben;C. Blake;H. Hildebrandt;H. Hoekstra;K. Kuijken;L. Miller;C. Morrison;A. Choi;J. D. Jong;J. D. Jong;K. Glazebrook;N. Irisarri;B. Joachimi;S. Joudaki;A. Kannawadi;C. Lidman;N. Napolitano;D. Parkinson;P. Schneider;E. V. Uitert;M. Viola;C. Wolf
中科院分区：
文献类型：
--
作者：
A. Amon;C. Heymans;D. Klaes;T. Erben;C. Blake;H. Hildebrandt;H. Hoekstra;K. Kuijken;L. Miller;C. Morrison;A. Choi;J. D. Jong;J. D. Jong;K. Glazebrook;N. Irisarri;B. Joachimi;S. Joudaki;A. Kannawadi;C. Lidman;N. Napolitano;D. Parkinson;P. Schneider;E. V. Uitert;M. Viola;C. Wolf
我们提出了一个弱引力透镜分析815度的i波段成像从千度调查（KiDS-i-800）。与深r波段观测相反，深r波段观测在良好的视宁度条件下优先进行，并形成了主要的KiDS数据集（KiDS-r-450），补充但较浅的KiDS-i-800跨越了广泛的观测条件。因此，重叠的KiDS-i-800和KiDS-r-450成像提供了评估弱透镜测量的鲁棒性的独特机会。在我们的分析中，我们引入了两个新的“空”测试。“零”的两点剪切相关函数使用匹配的星表来显示校准的KiDS-i-800和KiDS-r-450剪切测量值在1 ± 4%的水平上一致。我们使用五个星系透镜样本来确定来自完整KiDS-i-800和KiDS-r-450的“零”星系-星系透镜信号。450次调查，发现当使用光谱红移或COSMOS调查的30波段光度红移校准KiDS-i-800源红移分布时，测量结果符合7 ± 5%。
We present a weak gravitational lensing analysis of 815 deg of i-band imaging from the Kilo-Degree Survey (KiDS-i-800). In contrast to the deep r-band observations, which take priority during excellent seeing conditions and form the primary KiDS data set (KiDS-r-450), the complementary yet shallower KiDS-i-800 spans a wide range of observing conditions. The overlapping KiDS-i-800 and KiDS-r-450 imaging therefore provides a unique opportunity to assess the robustness of weak lensing measurements. In our analysis we introduce two new 'null' tests. The 'nulled' two-point shear correlation function uses a matched catalogue to show that the calibrated KiDS-i-800 and KiDS-r-450 shear measurements agree at the level of 1 ± 4 per cent.We use five galaxy lens samples to determine a 'nulled' galaxy-galaxy lensing signal from the full KiDS-i-800 and KiDS-r-450 surveys and find that the measurements agree to 7 ± 5 per cent when the KiDS-i-800 source redshift distribution is calibrated using either spectroscopic redshifts, or the 30-band photometric redshifts from the COSMOS survey.