Li, S-S;
Kuijken, K;
Hoekstra, H;
Hildebrandt, H;
Joachimi, B;
Kannawadi, A;
(2021)
KiDS+VIKING-450: An internal-consistency test for cosmic shear tomography with a colour-based split of source galaxies.
Astronomy & Astrophysics
, 646
, Article A175. 10.1051/0004-6361/202039254.
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Abstract
We performed an internal-consistency test of the KiDS+VIKING-450 (KV450) cosmic shear analysis with a colour-based split of source galaxies. Utilising the same measurements and calibrations for both sub-samples, we inspected the characteristics of the shear measurements and the performance of the calibration pipelines. On the modelling side, we examined the observational nuisance parameters, specifically those for the redshift calibration and intrinsic alignments, using a Bayesian analysis with dedicated test parameters. We verified that the current nuisance parameters are sufficient for the KV450 data to capture residual systematics, with slight deviations seen in the second and the third redshift tomographic bins. Our test also showcases the degeneracy between the inferred amplitude of intrinsic alignments and the redshift uncertainties in low redshift tomographic bins. The test is rather insensitive to the background cosmology and, therefore, can be implemented before any cosmological inference is made.
| Type: | Article |
|---|---|
| Title: | KiDS+VIKING-450: An internal-consistency test for cosmic shear tomography with a colour-based split of source galaxies |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202039254 |
| Publisher version: | https://doi.org/10.1051/0004-6361/202039254 |
| 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: 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.ucl.ac.uk/id/eprint/10122853 |
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