Cross-correlation of CFHTLenS galaxy catalogue and Planck CMB lensing using the halo model prescription⋆,⋆⋆
Physics department, École Normale Supérieure, 45 rue d’Ulm, 75005 Paris, France
Received: 10 July 2015
Accepted: 28 September 2015
Aims. I cross-correlate the galaxy counts from the Canada-France Hawaii Telescope Lensing Survey (CFHTLenS) galaxy catalogue and cosmic microwave background (CMB) convergence from the Planck data releases 1 (2013) and 2 (2015).
Methods. I improve on an earlier study by computing an analytic covariance from the halo model, implementing simulations to validate the theoretically estimated error bars and the reconstruction method, fitting both a galaxy bias and a cross-correlation amplitude using the joint cross and galaxy auto-correlation, and performing a series of null tests.
Results. Using a Bayesian analysis, I find a galaxy bias b = 0.92-0.02+0.02 and a cross-correlation amplitude A = 0.85-0.16+0.15 for the 2015 release, whereas for the 2013 release, I find b = 0.93-0.02+0.02 and A = 1.05-0.15+0.15.
Conclusions. I thus confirm the difference between the two releases found earlier, although both values of the amplitude now appear to be compatible with the fiducial value A = 1.
Key words: large-scale structure of Universe / cosmology: observations / cosmology: theory / gravitational lensing: weak
Based on observations obtained with Planck (http://www.esa.int/Planck), an ESA science mission with instruments and contributions directly funded by ESA Member States, NASA, and Canada.
A copy of the code is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/584/A53
© ESO, 2015