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CFHTLenS and RCSLenS cross-correlation with Planck lensing detected in fourier and configuration space

Harnois-Deraps, J; Troster, T; Hojjati, A; van Waerbeke, L; Asgari, M; Choi, A; Erben, T; ... Moutard, T; + view all (2016) CFHTLenS and RCSLenS cross-correlation with Planck lensing detected in fourier and configuration space. Monthly Notices of the Royal Astronomical Society , 460 (1) pp. 434-457. 10.1093/mnras/stw947. Green open access

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Abstract

We measure the cross-correlation signature between the Planck cosmic microwave background (CMB) lensing map and the weak lensing observations from both the Red-sequence Cluster Lensing Survey and the Canada–France–Hawaii Telescope Lensing Survey. In addition to a Fourier analysis, we include the first configuration-space detection, based on the estimators 〈κCMBκgal〉 and 〈κCMBγt〉. Combining 747.2 deg2 from both surveys, we find a detection significance that exceeds 4.2σ in both Fourier- and configuration-space analyses. Scaling the predictions by a free parameter A, we obtain APlanck CFHT = 0.68 ± 0.31 and APlanck RCS = 1.31 ± 0.33. In preparation for the next generation of measurements similar to these, we quantify the impact of different analysis choices on these results. First, since none of these estimators probes the exact same dynamical range, we improve our detection by combining them. Secondly, we carry out a detailed investigation on the effect of apodization, zero-padding and mask multiplication, validated on a suite of high-resolution simulations, and find that the latter produces the largest systematic bias in the cosmological interpretation. Finally, we show that residual contamination from intrinsic alignment and the effect of photometric redshift error are both largely degenerate with the characteristic signal from massive neutrinos, however the signature of baryon feedback might be easier to distinguish. The three lensing data sets are publicly available.

Type: Article
Title: CFHTLenS and RCSLenS cross-correlation with Planck lensing detected in fourier and configuration space
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stw947
Publisher version: http://dx.doi.org/10.1093/mnras/stw947
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, gravitational lensing: weak, dark matter, large-scale structure of Universe, GALAXY SHAPE MEASUREMENT, MATTER POWER SPECTRUM, COSMIC SHEAR, INTRINSIC ALIGNMENTS, COVARIANCE MATRICES, PRECISION COSMOLOGY, MASSIVE NEUTRINOS, DARK-MATTER, CMB, MODEL
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 Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10036527
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