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 $\Sigma_8 \equiv \sigma_8\left[\Omega_{\rm
m}/0.3\right]^{0.60}=0.765^{+0.030}_{-0.030}$ 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-D\'eraps et al
(2021), and hence we jointly analyse both surveys. 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 Planck
$w$CDM 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. (abridged)},
Year = {2024},
Month = {May},
Url = {http://arxiv.org/abs/2405.10312v2},
File = {2405.10312v2.pdf}
}