KiDS-1000 cosmic shear reanalysis using MetaCalibration
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909818822852608 |
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| author | Yoon, Mijin Hoekstra, Henk Li, Shun-Sheng Kuijken, Konrad Miller, Lance Hildebrandt, Hendrik Heymans, Catherine Joachimi, Benjamin Wright, Angus H. Asgari, Marika Busch, Jan Luca van den Reischke, Robert Stölzner, Benjamin |
| author_facet | Yoon, Mijin Hoekstra, Henk Li, Shun-Sheng Kuijken, Konrad Miller, Lance Hildebrandt, Hendrik Heymans, Catherine Joachimi, Benjamin Wright, Angus H. Asgari, Marika Busch, Jan Luca van den Reischke, Robert Stölzner, Benjamin |
| contents | A number of cosmic shear studies have reported results that are in mild tension with the Planck cosmic microwave measurement. To explore if this can be caused by biases in the shear estimation, we revisit the analysis of data from the Kilo-Degree Survey (KiDS) using an alternative shape measurement pipeline that is more robust to uncertainties in the calibration. To this end, we present an implementation of MetaCalibration, and compare its performance to that of lensfit, which has been used in previous analyses of these data. We find that the multiplicative bias is reduced, especially for the most distant redshifts, as derived from multi-band image simulations designed to match the KiDS data (SURFS-based KiDS-Legacy-Like Simulations: SKiLLS). For all tomographic bins we obtain a multiplicative bias $|m|<0.017$, with negligible additive bias. Importantly, the calibration has a negligible sensitivity to key galaxy properties. The resulting robust shear estimates were used to obtain cosmological parameter constraints. We find that the parameter $S_8\equiv σ_8 \sqrt{Ω_\mathrm{m}/0.3} =0.789_{-0.024}^{+0.020}$ is consistent with the previous KiDS-1000 lensfit constraint of $S_8=0.776^{+0.029 +0.002}_{-0.027-0.003}$ (statistical + systematic errors). Thanks to the higher effective source density, the constraining power is improved by about 28%. The difference in $S_8$ with the Planck value remains at a similar level, 1.8$σ$, implying that it is not caused by the shear measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_01122 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | KiDS-1000 cosmic shear reanalysis using MetaCalibration Yoon, Mijin Hoekstra, Henk Li, Shun-Sheng Kuijken, Konrad Miller, Lance Hildebrandt, Hendrik Heymans, Catherine Joachimi, Benjamin Wright, Angus H. Asgari, Marika Busch, Jan Luca van den Reischke, Robert Stölzner, Benjamin Cosmology and Nongalactic Astrophysics A number of cosmic shear studies have reported results that are in mild tension with the Planck cosmic microwave measurement. To explore if this can be caused by biases in the shear estimation, we revisit the analysis of data from the Kilo-Degree Survey (KiDS) using an alternative shape measurement pipeline that is more robust to uncertainties in the calibration. To this end, we present an implementation of MetaCalibration, and compare its performance to that of lensfit, which has been used in previous analyses of these data. We find that the multiplicative bias is reduced, especially for the most distant redshifts, as derived from multi-band image simulations designed to match the KiDS data (SURFS-based KiDS-Legacy-Like Simulations: SKiLLS). For all tomographic bins we obtain a multiplicative bias $|m|<0.017$, with negligible additive bias. Importantly, the calibration has a negligible sensitivity to key galaxy properties. The resulting robust shear estimates were used to obtain cosmological parameter constraints. We find that the parameter $S_8\equiv σ_8 \sqrt{Ω_\mathrm{m}/0.3} =0.789_{-0.024}^{+0.020}$ is consistent with the previous KiDS-1000 lensfit constraint of $S_8=0.776^{+0.029 +0.002}_{-0.027-0.003}$ (statistical + systematic errors). Thanks to the higher effective source density, the constraining power is improved by about 28%. The difference in $S_8$ with the Planck value remains at a similar level, 1.8$σ$, implying that it is not caused by the shear measurements. |
| title | KiDS-1000 cosmic shear reanalysis using MetaCalibration |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2510.01122 |