We present a weak gravitational lensing analysis of 815 square degree 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 dataset (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\%. 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\% when the KiDS-i-800 source redshift distribution is calibrated using either spectroscopic redshifts, or the 30-band photometric redshifts from the COSMOS survey.
@article{arxiv.1707.04105,
title = {KiDS-i-800: Comparing weak gravitational lensing measurements in same-sky surveys},
author = {A. Amon and C. Heymans and D. Klaes and T. Erben and C. Blake and H. Hildebrandt and H. Hoekstra and K. Kuijken and L. Miller and C. B. Morrison and A. Choi and J. T. A. de Jong and K. Glazebrook and N. Irissari and B. Joachimi and S. Joudaki and A. Kannawadi and C. Lidman and N. Napolitano and D. Parkinson and P. Schneider and E. van Uitert and M. Viola and C. Wolf},
journal= {arXiv preprint arXiv:1707.04105},
year = {2018}
}
Comments
24 pages, 20 figures. Submitted to MNRAS. Comments welcome