Giblin, B;
Heymans, C;
Asgari, M;
Hildebrandt, H;
Hoekstra, H;
Joachimi, B;
Kannawadi, A;
... Valentijn, E; + view all
(2020)
KiDS-1000 catalogue: Weak gravitational lensing shear measurements.
Astronomy & Astrophysics
10.1051/0004-6361/202038850.
(In press).
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Abstract
We present weak lensing shear catalogues from the fourth data release of the Kilo-Degree Survey, KiDS-1000, spanning 1006 square degrees of deep and high-resolution imaging. Our ‘gold-sample’ of galaxies, with well-calibrated photometric redshift distributions, consists of 21 million galaxies with an effective number density of 6.17 galaxies per square arcminute. We quantify the accuracy of the spatial, temporal, and flux-dependent point-spread function (PSF) model, verifying that the model meets our requirements to induce less than a 0.1σ change in the inferred cosmic shear constraints on the clustering cosmological parameter S 8 = σ8 √ Ωm/0.3. Through a series of two-point null-tests, we validate the shear estimates, finding no evidence for significant non-lensing B-mode distortions in the data. The PSF residuals are detected in the highest-redshift bins, originating from object selection and/or weight bias. The amplitude is, however, shown to be sufficiently low and within our stringent requirements. With a shear-ratio null-test, we verify the expected redshift scaling of the galaxy-galaxy lensing signal around luminous red galaxies. We conclude that the joint KiDS-1000 shear and photometric redshift calibration is sufficiently robust for combined-probe gravitational lensing and spectroscopic clustering analyses.
| Type: | Article |
|---|---|
| Title: | KiDS-1000 catalogue: Weak gravitational lensing shear measurements |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202038850 |
| Publisher version: | https://doi.org/10.1051/0004-6361/202038850 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gravitational lensing: weak, methods: data analysis, methods: statistical, surveys, cosmology: observations |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10116562 |
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