CFHTLenS and RCSLenS crosscorrelation with Planck lensing detected in fourier and configuration space
Abstract
We measure the crosscorrelation signature between the Planck cosmic microwave background (CMB) lensing map and the weak lensing observations from both the Redsequence Cluster Lensing Survey and the CanadaFranceHawaii Telescope Lensing Survey. In addition to a Fourier analysis, we include the first configurationspace detection, based on the estimators <κ_{CMB}κ_{gal}> and <κ_{CMB}γ_{t}>. Combining 747.2 deg^{2} from both surveys, we find a detection significance that exceeds 4.2σ in both Fourier and configurationspace analyses. Scaling the predictions by a free parameter A, we obtain A^Planck_CFHT= 0.68± 0.31 and A^Planck_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, zeropadding and mask multiplication, validated on a suite of highresolution 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.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 July 2016
 DOI:
 10.1093/mnras/stw947
 arXiv:
 arXiv:1603.07723
 Bibcode:
 2016MNRAS.460..434H
 Keywords:

 gravitational lensing: weak;
 dark matter;
 largescale structure of Universe;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 Version accepted by MNRAS. This paper has 23 pages, 18 figures, and is coordinated with a public release of the RCSLenS lensing data: http://www.cadcccda.hiaiha.nrccnrc.gc.ca/en/community/rcslens/query.html (see arXiv:1603.07722)