Köhlinger, F;
Viola, M;
Joachimi, B;
Hoekstra, H;
van Uitert, E;
Hildebrandt, H;
Choi, A;
... Valentijn, EA; + view all
(2017)
KiDS-450: the tomographic weak lensing power spectrum and constraints on cosmological parameters.
Monthly Notices of the Royal Astronomical Society
, 471
(4)
pp. 4412-4435.
10.1093/mnras/stx1820.
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Abstract
We present measurements of the weak gravitational lensing shear power spectrum based on 450deg2 450deg2 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 autocorrelation and cross-correlation spectra in the multipole range 76 ≤ ℓ ≤ 1310. The cosmological interpretation of the measured shear power spectra is performed in a Bayesian framework assuming a ΛCDM model with spatially flat geometry, while accounting for small residual uncertainties in the shear calibration and redshift distributions as well as marginalizing 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 S8≡σ8Ωm/0.3−−−−−−√ S8≡σ8Ωm/0.3 yielding S8 = 0.651 ± 0.058 (three z-bins), confirming the recently reported tension in this parameter with constraints from Planck at 3.2σ (three z-bins). We cross-check the results of the three z-bin analysis with the weaker constraints from the two 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.
| Type: | Article |
|---|---|
| Title: | KiDS-450: the tomographic weak lensing power spectrum and constraints on cosmological parameters |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx1820 |
| Publisher version: | https://doi.org/10.1093/mnras/stx1820 |
| Language: | English |
| Additional information: | This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gravitational lensing: weak, cosmological parameters – cosmology: observations, large-scale structure of Universe |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1562405 |
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