We measure the cross-power spectrum between galaxy density from Canada-France-Hawaii-Telescope Lensing Survey ( CFHTLenS ) catalogues and gravitational lensing convergence from Planck data release 1 ( 2013 ) and 2 ( 2015 ) .
We investigate three main galaxy samples : 18.0 < i _ { AB } < 22.0 , 18.0 < i _ { AB } < 23.0 , 18.0 < i _ { AB } < 24.0 in the redshift range 0.2 < z < 1.3 in each of the four CFHTLenS wide fields .
By comparing the measured cross-spectrum with model predictions , linear galaxy-dark matter biases of b = 0.82 ^ { +0.24 } _ { -0.23 } , 0.83 ^ { +0.19 } _ { -0.18 } , 0.82 ^ { +0.16 } _ { -0.14 } are inferred at significances of 3.5 , 4.5 , 5.6 \sigma using the Planck 2015 release .
These measurements are marginally consistent with biases derived from galaxy-galaxy auto-correlations : b = 1.15 ^ { +0.02 } _ { -0.01 } , 1.08 ^ { +0.01 } _ { -0.01 } and 0.96 ^ { +0.01 } _ { -0.01 } respectively .
Using the 2013 Planck release , we obtain biases of b = 1.33 ^ { +0.29 } _ { -0.28 } , 1.19 ^ { +0.23 } _ { -0.23 } , 1.16 ^ { +0.19 } _ { -0.18 } , showing significant differences between the releases .