KiDS-i-800: Comparing weak gravitational lensing measurements from same-sky surveys

A. Amon, C. Heymans, D. Klaes, T. Erben, C. Blake, H. Hildebrandt, H. Hoekstra, K. Kuijken, L. Miller, C. B. Morrison, A. Choi, J. T.A. de Jong, K. Glazebrook, N. Irisarri, B. Joachimi, S. Joudaki, A. Kannawadi, C. Lidman, N. Napolitano, D. ParkinsonP. Schneider, E. van Uitert, M. Viola, C. Wolf

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)4285-4307
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Volume477
Issue number4
Early online date5 Apr 2018
DOIs
Publication statusPublished - 11 Jul 2018

Keywords

  • Cosmology: observations
  • Galaxies: photometry
  • Gravitational lensing: weak
  • Surveys

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