BibTeX

@article{2405.10312v2,
Author        = {Joachim Harnois-Deraps and Sven Heydenreich and Benjamin Giblin and Nicolas Martinet and Tilman Troester and Marika Asgari and Pierre Burger and Tiago Castro and Klaus Dolag and Catherine Heymans and Hendrik Hildebrandt and Benjamin Joachimi and Angus H. Wright},
Title         = {KiDS-1000 and DES-Y1 combined: Cosmology from peak count statistics},
Eprint        = {2405.10312v2},
ArchivePrefix = {arXiv},
PrimaryClass  = {astro-ph.CO},
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 2-4arcmin, probing deep into the non-linear regime of structure formation. We interpret our results with a simulation-based inference pipeline, sampling over a broad $w$CDM prior volume and marginalising 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 $Σ_8 \equiv σ_8\left[Ω_{\rm m}/0.3\right]^{0.60}=0.765^{+0.030}_{-0.030}$ 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 (2021), and hence we jointly analyse both surveys. We obtain $Σ_8^{\rm joint} \equiv σ_8\left[Ω_{\rm m}/0.3\right]^{0.57}=0.759^{+0.020}_{-0.017}$, in agreement with the Planck $w$CDM results. The shear-CMB tension on this parameter increases to $3.1σ$ when forcing $w=-1.0$, and to $4.1σ$ if comparing instead with $S_{8,Λ{\rm CDM}}^{\rm joint} = 0.736^{+0.016}_{-0.018}$, one of the tightest constraints to date on this quantity. (abridged)},
Year          = {2024},
Month         = {May},
Url           = {http://arxiv.org/abs/2405.10312v2},
File          = {2405.10312v2.pdf}
}