Dark matter halo properties from galaxy-galaxy lensing
  We present results for a galaxy-galaxy lensing study based on imaging data
from the Canada-France-Hawaii Telescope Legacy Survey Wide. From a 12 million
object multi-colour catalogue for 124 deg^2 of photometric data in the
u*g'r'i'z' filters we compute photometric redshifts (with a scatter of
\sigma_{\Delta z/(1+z)} = 0.033 and an outlier rate of \eta=2.0 per cent for
i'<=22.5) and extract galaxy shapes down to i'=24.0. We select a sample of
lenses and sources with 0.05 < z_d <= 1 and 0.05 < z_s <= 2. We fit three
different galaxy halo profiles to the lensing signal, a singular isothermal
sphere (SIS), a truncated isothermal sphere (BBS) and a universal density
profile (NFW). We derive velocity dispersions by fitting an SIS out to 100
h^{-1} kpc to the excess surface mass density \Delta\Sigma and perform maximum
likelihood analyses out to a maximum scale of 2 h^{-1} Mpc to obtain halo
parameters and scaling relations. We find luminosity scaling relations of
\sigma_{red} ~ L^{0.24+-0.03} for the red lens sample, \sigma_{blue} ~
L^{0.23+-0.03} for blue lenses and \sigma ~ L^{0.29+-0.02} for the combined
lens sample with zeropoints of \sigma*_{red}=162+-2 km/s, \sigma*_{blue}=115+-3
km/s and \sigma*=135+-2 km/s at a chosen reference luminosity L*_{r'} = 1.6
\times 10^10 h^{-2} L_{r',sun}. The steeper slope for the combined sample is
due to the different zeropoints of the blue and red lenses and the fact that
blue lenses dominate at low luminosities and red lenses at high luminosities.
The mean effective redshifts for the lens samples are <z_{red}>=0.28 for red
lenses, <z_{blue}>=0.35 for blue lenses and <z>=0.34 for the combined lens
sample.
