KiDS-1000 and DES-Y1 combined: cosmology from peak count statistics

ABSTRACT We analyse the fourth data release of the Kilo Degree Survey (KiDS-1000) and extract cosmological parameter constraints based on the cosmic shear peak count statistics. Peaks are identified in aperture mass maps in which the filter is maximally sensitive to angular scales in the range 2–4 arcmin, probing deep into the non-linear regime of structure formation. We interpret our results with a simulation-based inference pipeline, sampling over a broad wCDM prior volume and marginalizing over uncertainties on shape calibration, photometric redshift distribution, intrinsic alignment, and baryonic feedback. Our measurements constrain the structure growth parameter and the amplitude of the non-linear intrinsic alignment model to $\Sigma _8 \equiv \sigma _8\left[\Omega _{\rm m}/0.3\right]^{0.60}=0.765^{+0.030}_{-0.030}$ and $A_{\rm IA}= 0.71^{+0.42}_{-0.42}$, respectively, in agreement with previous KiDS-1000 results based on two-point shear statistics. These results are robust against modelling of the non-linear physics, different scale cuts, and selections of tomographic bins. The posterior is also consistent with that from the Dark Energy Survey Year-1 peak count analysis presented in Harnois-Déraps et al., and hence we jointly analyse both surveys with a common pipeline. We obtain $\Sigma _8^{\rm joint} \equiv \sigma _8\left[\Omega _{\rm m}/0.3\right]^{0.57}=0.759^{+0.020}_{-0.017}$, in agreement with the PlanckwCDM results. The shear-CMB tension on this parameter increases to $3.1\sigma$ when forcing $w=-1.0$, and to $4.1\sigma$ if comparing instead with $S_{8,\Lambda {\rm CDM}}^{\rm joint} = 0.736^{+0.016}_{-0.018}$, one of the tightest constraints to date on this quantity. Residual biases in the photometric redshifts of the DES-Y1 data and in the modelling of small scales physics could lower this tension, however it is robust against other systematics. Limits in the accuracy of our emulator prevent us from constraining $\Omega _{\rm m}$.

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Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-09-27
DOI
https://doi.org/10.1093/mnras/stae2249
Citations
22
Primary Topic
Astrophysics and Cosmic Phenomena
Type
article
Field-Weighted Citation Impact
14.51

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article

KiDS-1000 and DES-Y1 combined: cosmology from peak count statistics

Catherine Heymans, Angus H. Wright, Tilman Tröster, Benjamin Joachimi et al.
22 citations
Monthly Notices of the Royal Astronomical Society
Astrophysics and Cosmic Phenomena
14.51
article

KiDS-1000 and DES-Y1 combined: cosmology from peak count statistics

Catherine Heymans, Angus H. Wright, Tilman Tröster, Benjamin Joachimi, T. Castro, H. Hildebrandt, N. Martinet, Pierre Burger, Sven Heydenreich, Marika Asgari, Benjamin Giblin, Joachim Harnois-Déraps, Klaus Dolag
article en
22 citations

Abstract

ABSTRACT We analyse the fourth data release of the Kilo Degree Survey (KiDS-1000) and extract cosmological parameter constraints based on the cosmic shear peak count statistics. Peaks are identified in aperture mass maps in which the filter is maximally sensitive to angular scales in the range 2–4 arcmin, probing deep into the non-linear regime of structure formation. We interpret our results with a simulation-based inference pipeline, sampling over a broad wCDM prior volume and marginalizing over uncertainties on shape calibration, photometric redshift distribution, intrinsic alignment, and baryonic feedback. Our measurements constrain the structure growth parameter and the amplitude of the non-linear intrinsic alignment model to $\Sigma _8 \equiv \sigma _8\left[\Omega _{\rm m}/0.3\right]^{0.60}=0.765^{+0.030}_{-0.030}$ and $A_{\rm IA}= 0.71^{+0.42}_{-0.42}$, respectively, in agreement with previous KiDS-1000 results based on two-point shear statistics. These results are robust against modelling of the non-linear physics, different scale cuts, and selections of tomographic bins. The posterior is also consistent with that from the Dark Energy Survey Year-1 peak count analysis presented in Harnois-Déraps et al., and hence we jointly analyse both surveys with a common pipeline. We obtain $\Sigma _8^{\rm joint} \equiv \sigma _8\left[\Omega _{\rm m}/0.3\right]^{0.57}=0.759^{+0.020}_{-0.017}$, in agreement with the PlanckwCDM results. The shear-CMB tension on this parameter increases to $3.1\sigma$ when forcing $w=-1.0$, and to $4.1\sigma$ if comparing instead with $S_{8,\Lambda {\rm CDM}}^{\rm joint} = 0.736^{+0.016}_{-0.018}$, one of the tightest constraints to date on this quantity. Residual biases in the photometric redshifts of the DES-Y1 data and in the modelling of small scales physics could lower this tension, however it is robust against other systematics. Limits in the accuracy of our emulator prevent us from constraining $\Omega _{\rm m}$.

Monthly Notices of the Royal Astronomical SocietyVol. 534(4)
University of Waterloo (CA), University of California, Santa Cruz (US), University of Hull (GB), Aix-Marseille Université (FR), Trieste Astronomical Observatory (IT), ETH Zurich (CH), Institute of Particle Physics (CA), Max Planck Institute for Astrophysics (DE), Astronomical Institute of the Slovak Academy of Sciences (SK), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT), Institute for Fundamental Physics of the Universe (IT), Fondazione ICSC Centro Nazionale di Ricerca in High Performance Computing, Big Data e Quantum Computing, University College London (GB), UK Astronomy Technology Centre (GB), Newcastle University (GB), Ruhr University Bochum (DE), University of Edinburgh (GB)
National Science Foundation, U.S. Department of Energy, California Department of Fish and Game, UK Research and Innovation, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Ministero dell’Istruzione, dell’Università e della Ricerca, Office of Science, Engineering and Physical Sciences Research Council, Science and Technology Facilities Council, High Energy Physics, H2020 European Research Council
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