Amon, A; Heymans, C; Klaes, D; Erben, T; Blake, C; Hildebrandt, H; Hoekstra, H; ... Wolf, C; + view all Amon, A; Heymans, C; Klaes, D; Erben, T; Blake, C; Hildebrandt, H; Hoekstra, H; Kuijken, K; Miller, L; Morrison, CB; Choi, A; de Jong, JTA; Glazebrook, K; Irisarri, N; Joachimi, B; Joudaki, S; Kannawadi, A; Lidman, C; Napolitano, N; Parkinson, D; Schneider, P; van Uitert, E; Viola, M; Wolf, C; - view fewer (2018) KiDS-i-800: Comparing weak gravitational lensing measurements from same-sky surveys. Monthly Notices of the Royal Astronomical Society , 477 (4) pp. 4285-4307. 10.1093/mnras/sty859.

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Abstract

We present a weak gravitational lensing analysis of 815 deg2 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.

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