We present a new measurement of the mass-concentration relation and the stellar-to-halo mass ratio over a 5 \times 10 ^ { 12 } M _ { \odot } to 2 \times 10 ^ { 14 } M _ { \odot } mass range .
To achieve this , we use the CFHT Stripe 82 Survey ( CS82 ) weak lensing data combined with a well defined catalog of clusters ( the redMaPPer catalogue ) and the LOWZ/CMASS galaxies of the Sloan Digital Sky Survey-III Baryon Oscillation Spectroscopic Survey Tenth Data Release ( SDSS-III BOSS DR10 ) .
The stacked lensing signals around these samples are modeled as a sum of contributions from the central galaxy , the dark matter halo , and the neighboring halos .
We measure the mass-concentration relation : c _ { 200 } ( M ) = A ( \frac { M _ { 200 } } { M _ { 0 } } ) ^ { B } with A = 5.25 \pm 1.67 ,B = -0.13 \pm 0.12 for 0.2 < z < 0.4 and A = 6.77 \pm 1.13 ,B = -0.15 \pm 0.06 for 0.4 < z < 0.6 .
We conclude that the amplitude A and slope B are both consistent with the simulation predictions by Klypin et al .
( 2014 ) within the errors .
We also measure the stellar-to-halo mass ratio and find it to be flatter than previous measurement for high stellar masses because of the complex structures and merger history in massive dark matter halos .