Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback

Jeger C. Broxterman; Patrick Simon; Lucas Porth; Konrad Kuijken; Angus H. Wright; Marika Asgari; Maciej Bilicki; Catherine Heymans; Hendrik Hildebrandt; Henk Hoekstra; Benjamin Joachimi; Shun-Sheng Li; Matteo Maturi; Lauro Moscardini; Mario Radovich; Robert Reischke; Maximilian Von Wietersheim-Kramsta

doi:10.1051/0004-6361/202557182

Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback

Jeger C. Broxterman^*, Patrick Simon^*, Lucas Porth, Konrad Kuijken, Angus H. Wright, Marika Asgari, Maciej Bilicki, Catherine Heymans, Hendrik Hildebrandt, Henk Hoekstra, Benjamin Joachimi, Shun-Sheng Li, Matteo Maturi, Lauro Moscardini, Mario Radovich, Robert Reischke, Maximilian Von Wietersheim-Kramsta

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Letter › peer-review

Abstract

Direct measurements of the matter power spectrum, P _m(k, z), provide a powerful tool for investigating the observed tensions between models of structure growth, while also testing the internal consistency of cosmological probes. We analysed the cosmic shear data from the final data release of the Kilo-Degree Survey (KiDS), and present a deprojected P _m(k, z), measured in up to three redshift bins. Compared to analyses using previous KiDS releases, we find improved internal consistency in the z ≲ 0.7 regime. At large scales, k ≲ 0.1 h Mpc ⁻¹, our power spectrum reconstruction aligns with ΛCDM predictions with a density fluctuation amplitude σ ₈ = 0.81. Furthermore, at small scales, k = 3–20 h Mpc ⁻¹, the average matter power spectrum is suppressed by 30%±10% (stat.) ± 4% (sys.) with 2.8σ significance relative to a dark matter-only model, consistent with expectations of strong baryonic feedback.

Original language	English
Article number	L3
Pages (from-to)	1-8
Number of pages	8
Journal	Astronomy and Astrophysics
Volume	703
Early online date	30 Oct 2025
DOIs	https://doi.org/10.1051/0004-6361/202557182
Publication status	Published - 1 Nov 2025

Keywords / Materials (for Non-textual outputs)

Gravitational lensing: weak - large-scale structure of Universe
Cosmology: observations

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10.1051/0004-6361/202557182Licence: Creative Commons: Attribution (CC-BY)

https://arxiv.org/abs/2509.08365Licence: Creative Commons: Attribution (CC-BY)

Astronomy and Astrophysics at Edinburgh
Best, P. (Principal Investigator), Biller, B. (Co-investigator), Dave, R. (Co-investigator), Dunlop, J. (Co-investigator), Heymans, C. (Co-investigator), Khochfar, S. (Co-investigator), McLure, R. (Co-investigator), Palmer, P. (Co-investigator), Peacock, J. (Co-investigator), Rice, K. (Co-investigator), Smith, B. (Co-investigator) & Taylor, A. (Co-investigator)
Science and Technology Facilities Council
1/04/21 → 31/03/25
Project: Research

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Broxterman, J. C., Simon, P., Porth, L., Kuijken, K., Wright, A. H., Asgari, M., Bilicki, M., Heymans, C., Hildebrandt, H., Hoekstra, H., Joachimi, B., Li, S.-S., Maturi, M., Moscardini, L., Radovich, M., Reischke, R., & Wietersheim-Kramsta, M. V. (2025). Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback. Astronomy and Astrophysics, 703, 1-8. Article L3. https://doi.org/10.1051/0004-6361/202557182

@article{3a924f8cd9284725a09fa3296414e006,

title = "Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback",

abstract = "Direct measurements of the matter power spectrum, P m(k, z), provide a powerful tool for investigating the observed tensions between models of structure growth, while also testing the internal consistency of cosmological probes. We analysed the cosmic shear data from the final data release of the Kilo-Degree Survey (KiDS), and present a deprojected P m(k, z), measured in up to three redshift bins. Compared to analyses using previous KiDS releases, we find improved internal consistency in the z ≲ 0.7 regime. At large scales, k ≲ 0.1 h Mpc −1, our power spectrum reconstruction aligns with ΛCDM predictions with a density fluctuation amplitude σ 8 = 0.81. Furthermore, at small scales, k = 3–20 h Mpc −1, the average matter power spectrum is suppressed by 30\%±10\% (stat.) ± 4\% (sys.) with 2.8σ significance relative to a dark matter-only model, consistent with expectations of strong baryonic feedback.",

keywords = "Gravitational lensing: weak - large-scale structure of Universe, Cosmology: observations",

author = "Broxterman, \{Jeger C.\} and Patrick Simon and Lucas Porth and Konrad Kuijken and Wright, \{Angus H.\} and Marika Asgari and Maciej Bilicki and Catherine Heymans and Hendrik Hildebrandt and Henk Hoekstra and Benjamin Joachimi and Shun-Sheng Li and Matteo Maturi and Lauro Moscardini and Mario Radovich and Robert Reischke and Wietersheim-Kramsta, \{Maximilian Von\}",

note = "8 pages, 5 figures (including the appendices). Accepted for publication in A\&A",

year = "2025",

month = nov,

day = "1",

doi = "10.1051/0004-6361/202557182",

language = "English",

volume = "703",

pages = "1--8",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Broxterman, JC, Simon, P, Porth, L, Kuijken, K, Wright, AH, Asgari, M, Bilicki, M, Heymans, C, Hildebrandt, H, Hoekstra, H, Joachimi, B, Li, S-S, Maturi, M, Moscardini, L, Radovich, M, Reischke, R & Wietersheim-Kramsta, MV 2025, 'Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback', Astronomy and Astrophysics, vol. 703, L3, pp. 1-8. https://doi.org/10.1051/0004-6361/202557182

TY - JOUR

T1 - Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback

AU - Broxterman, Jeger C.

AU - Simon, Patrick

AU - Porth, Lucas

AU - Kuijken, Konrad

AU - Wright, Angus H.

AU - Asgari, Marika

AU - Bilicki, Maciej

AU - Heymans, Catherine

AU - Hildebrandt, Hendrik

AU - Hoekstra, Henk

AU - Joachimi, Benjamin

AU - Li, Shun-Sheng

AU - Maturi, Matteo

AU - Moscardini, Lauro

AU - Radovich, Mario

AU - Reischke, Robert

AU - Wietersheim-Kramsta, Maximilian Von

N1 - 8 pages, 5 figures (including the appendices). Accepted for publication in A&A

PY - 2025/11/1

Y1 - 2025/11/1

N2 - Direct measurements of the matter power spectrum, P m(k, z), provide a powerful tool for investigating the observed tensions between models of structure growth, while also testing the internal consistency of cosmological probes. We analysed the cosmic shear data from the final data release of the Kilo-Degree Survey (KiDS), and present a deprojected P m(k, z), measured in up to three redshift bins. Compared to analyses using previous KiDS releases, we find improved internal consistency in the z ≲ 0.7 regime. At large scales, k ≲ 0.1 h Mpc −1, our power spectrum reconstruction aligns with ΛCDM predictions with a density fluctuation amplitude σ 8 = 0.81. Furthermore, at small scales, k = 3–20 h Mpc −1, the average matter power spectrum is suppressed by 30%±10% (stat.) ± 4% (sys.) with 2.8σ significance relative to a dark matter-only model, consistent with expectations of strong baryonic feedback.

AB - Direct measurements of the matter power spectrum, P m(k, z), provide a powerful tool for investigating the observed tensions between models of structure growth, while also testing the internal consistency of cosmological probes. We analysed the cosmic shear data from the final data release of the Kilo-Degree Survey (KiDS), and present a deprojected P m(k, z), measured in up to three redshift bins. Compared to analyses using previous KiDS releases, we find improved internal consistency in the z ≲ 0.7 regime. At large scales, k ≲ 0.1 h Mpc −1, our power spectrum reconstruction aligns with ΛCDM predictions with a density fluctuation amplitude σ 8 = 0.81. Furthermore, at small scales, k = 3–20 h Mpc −1, the average matter power spectrum is suppressed by 30%±10% (stat.) ± 4% (sys.) with 2.8σ significance relative to a dark matter-only model, consistent with expectations of strong baryonic feedback.

KW - Gravitational lensing: weak - large-scale structure of Universe

KW - Cosmology: observations

U2 - 10.1051/0004-6361/202557182

DO - 10.1051/0004-6361/202557182

M3 - Letter

SN - 0004-6361

VL - 703

SP - 1

EP - 8

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L3

ER -

Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback

Abstract

Keywords / Materials (for Non-textual outputs)

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Astronomy and Astrophysics at Edinburgh

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