Journal article
Cosmic shear with small scales: DES-Y3, KiDS-1000 and HSC-DR1
- Abstract:
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We present a cosmological analysis of the combination of the DES-Y3, KiDS-1000 and HSC-DR1 weak lensing samples under a joint harmonic-space pipeline making use of angular scales down to $\ell_{\max}=4500$, corresponding to significantly smaller scales ($\delta\theta \sim 2.4$) than those commonly used in cosmological weak lensing studies. We are able to do so by accurately modelling non-linearities and the impact of baryonic effects using Baccoemu. We find $S_8 \equiv \sigma_8 \sqrt{\Omega_m/0.3} = 0.795^{+0.015}{-0.017}$, in relatively good agreement with CMB constraints from Planck (less than $\sim 1.8\sigma$ tension), although we obtain a low value of $\Omega_m = 0.212^{+0.017}{-0.032}$, in tension with Planck at the $\sim 3\sigma$ level. We show that this can be recast as an $H_0$ tension if one parametrises the amplitude of fluctuations and matter abundance in terms of variables without hidden dependence on $H_0$. Furthermore, we find that this tension reduces significantly after including a prior on the distance-redshift relationship from BAO data, without worsening the fit. In terms of baryonic effects, we show that failing to model and marginalise over them on scales $\ell \lesssim 2000$ does not significantly affect the posterior constraints for DES-Y3 and KiDS-1000, but has a mild effect on deeper samples, such as HSC-DR1. This is in agreement with our ability to only mildly constrain the parameters of the Baryon Correction Model with these data.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 9.1MB, Terms of use)
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- Publisher copy:
- 10.1088/1475-7516/2024/08/024
Authors
- Funder identifier:
- https://ror.org/057g20z61
- Grant:
- ST/W000903/1
- Publisher:
- IOP Publishing
- Journal:
- Journal of Cosmology and Astroparticle Physics More from this journal
- Volume:
- 2024
- Issue:
- 08
- Article number:
- 24
- Publication date:
- 2024-08-13
- Acceptance date:
- 2024-07-25
- DOI:
- EISSN:
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1475-7516
- Language:
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English
- Keywords:
- Pubs id:
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2023231
- Local pid:
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pubs:2023231
- Deposit date:
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2025-05-07
- ARK identifier:
Terms of use
- Copyright holder:
- García-García et al
- Copyright date:
- 2024
- Rights statement:
- © 2024 The Author(s). Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
- Licence:
- CC Attribution (CC BY)
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