UNIONS-3500 Weak Lensing: III. 2D Cosmological Constraints in Configuration Space

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ID: 329015
2026
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Abstract
Abstract We present the first cosmological constraints from the cosmic shear analysis of the UNIONS-3500 weak lensing galaxy catalogue in configuration space. The Ultraviolet Near Infrared Optical Northern Survey (UNIONS) is the largest and deepest photometric survey of the northern hemisphere to date, with the UNIONS-3500 catalogue using high-quality r-band imaging across 3500 deg2 of the sky. We perform a 2D cosmic shear analysis using the two-point correlation function (2PCF) statistic with one source bin, since only single band photometry is currently available, and the redshift distribution has to be calibrated based on external fields. Assuming a flat ΛCDM model, we obtain constraints on the clustering amplitude of $S_8 \equiv \sigma _8\sqrt{\Omega _{\rm m}/0.3}= 0.831^{+0.067}_{-0.078}$, which is consistent with constraints from Planck CMB measurements and precedent cosmic shear results within 1σ. We outline the construction of our cosmological inference pipeline, including the estimation of the source redshift distribution, shear calibration, and covariance matrix, and describe methodologies for the mitigation of systematic effects arising from PSF systematics and B-modes. We demonstrate that our results are largely robust to variations in analysis choices, including scale cuts, prior ranges, and nonlinear modelling, while being most sensitive to the effects of intrinsic alignment due to the current lack of tomographic information. This paper is part of a coordinated release which collectively demonstrates the maturity and readiness of UNIONS to deliver compelling cosmological results, positioning it as a key stepping stone towards the forthcoming era of Stage IV weak lensing experiments.
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Authors L. W. K. Goh, S. Guerrini, C. Daley, F. Hervas-Peters, M. Kilbinger, A. Wittje, C. Murray, L Baumont, S. Fabbro, H Hildebrandt, Michael J. Hudson, L van Waerbeke, A H Wright, T de Boer, Jean‐Charles Cuillandre, E Magnier, Alan W. McConnachie
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1774
URL
https://doi.org/10.1093/mnras/stag1774
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