Separating Galaxies from the Cluster Dark Matter Halo in Abell 611
  We investigate the mass content of galaxies in the core of the galaxy cluster
Abell 611. We perform a strong lensing analysis of the cluster core and use
velocity dispersion measurements for individual cluster members as additional
constraints. Despite the small number of multiply-imaged systems and cluster
members with central velocity dispersions available in the core of A611, the
addition of velocity dispersion measurements leads to tighter constraints on
the mass associated with the galaxy component, and as a result, on the mass
associated with the dark matter halo. Without the spectroscopic velocity
dispersions, we would overestimate the mass of the galaxy component by a factor
of $\sim1.5$, or, equivalently, we would underestimate the mass of the cluster
dark halo by $\sim5\%$. We perform an additional lensing analysis using surface
brightness (SB) reconstruction of the tangential giant arc. This approach
improves the constraints on the mass parameters of the 5 galaxies close to the
arc by up to a factor $\sim10$. The galaxy velocity dispersions resulting from
the SB analysis are consistent at the 1$\sigma$ confidence level with the
spectroscopic measurements and with the prediction from the simple pointlike
analysis. In contrast the truncation radii for 2-3 galaxies depart
significantly from the galaxy scaling relation and suggest differences in the
stripping history from galaxy to galaxy.
