KiDS-450: The tomographic weak lensing power spectrum and constraints on cosmological parameters

By F. Köhlinger, M. Viola, B. Joachimi, H. Hoekstra, E. V. Uitert, H. Hildebrandt, A. Choi, T. Erben, Catherine Heymans, S. Joudaki and 6 more. 2017

179 citations recorded by the source corpus.

We present measurements of the weak gravitational lensing shear power spectrum based on $450$ sq. deg. of imaging data from the Kilo Degree Survey. We employ a quadratic estimator in two and three redshift bins and extract band powers of redshift auto-correlation and cross-correlation spectra in the multipole range $76 \leq \ell \leq 1310$. The cosmological interpretation of the measured shear power spectra is performed in a Bayesian framework assuming a $\Lambda$CDM model with spatially flat geometry, while accounting for small residual uncertainties in the shear calibration and redshift distributions as well as marginalising over intrinsic alignments, baryon feedback and an excess-noise power model. Moreover, massive neutrinos are included in the modelling. The cosmological main result is expressed in terms of the parameter combination $S_8 \equiv \sigma_8 \sqrt{\Omega_{\rm m}/0.3}$ yielding $S_8 = \ 0.651 \pm 0.058$ (3 z-bins), confirming the recently reported tension in this parameter with constraints from Planck at $3.2\sigma$ (3 z-bins). We cross-check the results of the 3 z-bin analysis with the weaker constraints from the 2 z-bin analysis and find them to be consistent. The high-level data products of this analysis, such as the band power measurements, covariance matrices, redshift distributions, and likelihood evaluation chains are available at http://kids.strw.leidenuniv.nl/

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/45bb15ab360da2ba631c32205fb414b5aaa57783

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Citations in the corpus

Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data (2019, methodology): “All three projects have published initial cosmic shear analyses with early data, yielding 4−8 percent constraints on S8 (Troxel et al. 2018; Hildebrandt et al. 2017; Köhlinger et al. 2017; Hildebrandt et al. 2020; Hikage et al. 2019).”
Implications of an extended dark energy cosmology with massive neutrinos for cosmological tensions (2018, methodology): “Furthermore, there is a long-standing discrepancy between LSS surveys and the CMB determination of the quantity S8 = σ8(ΩM/Ω ref M ) α, where σ8 is the amplitude of matter density fluctuations in spheres with radius of 8h−1 Mpc, ΩM is the relic density of matter in the Universe today, and ΩrefM is a”
KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering (2017, background): “For cosmic shear alone, these cuts widen the uncertainty and lower the constraint on S8 = 0.55+0.17−0.12 (Joudaki et al. 2017b), increasing the agreement with the KiDS power spectrum analysis in Köhlinger et al. (2017).”
Interacting dark sector and precision cosmology (2017, unknown): “Indeed, when the KiDS-450 + 2dFLenS weak lensing and redshift-space galaxy clustering data is reduced to a gaussian constraint on σ8(Ωm/0.30) 0.5 = 0.742± 0.035 [5], we find that the five IDS best-fit models obtained in this analysis have a χ2 of 0.25 to 1.9 with respect to this data point, thus sol”
Elucidating ΛCDM: Impact of Baryon Acoustic Oscillation Measurements on the Hubble Constant Discrepancy (2017, methodology): “…between the Planck predictions for the growth of cosmic structure (through the matter density, Ωm, and present-day density fluctuation amplitude, σ8) and measurements using weak gravitational lensing (e.g., Hildebrandt et al. 2017; Joudaki et al. 2017; Alsing et al. 2017; Köhlinger et al. 2017).”
The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees (2019, background): “Though designed for the primary cosmology science case (KiDS450; Joudaki et al. 2017; van Uitert et al. 2018; Köhlinger et al. 2017; Harnois-Déraps et al. 2017; Amon et al. 2018; Shan et al. 2018; Martinet et al. 2018; Giblin et al. 2018; Asgari et al. 2019), KiDS data are also being used for a…”
The Zwicky Transient Facility: Science Objectives (2019, methodology): “This will directly test recent claims of deviations between the measured structure of the nearby Universe and the ΛCDM predictions derived from the Planck CMB map (Hildebrandt et al. 2017; Köhlinger et al. 2017).”
CMB-S4 Science Case, Reference Design, and Project Plan (2019, background): “These possibilities may also play a role in explaining the discrepancies observed in the Hubble constant H0 measurements [160, 161, 162, 163, 164], the amplitude of fluctuations σ8 [165, 166, 167, 168], and clustering on small scales [169, 127].”
Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data (2018, methodology): “We evaluate the impact of baryons following the methodology used in Köhlinger et al. (2017) and use a fitting formula from Harnois-Déraps et al. (2015) that interpolates between the result for the matter power spectrum in the collisionless case and a model with extreme baryonic feedback, with the…”
KiDS+GAMA : cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing, and angular clustering (2017, methodology): “This is further supported by the fact that we detect B modes at a higher significance than Köhlinger et al. (2017), where they are found to be consistent with zero.”