In this work we analyze the mass distribution of MACSJ1206.2-0847 , especially focusing on the halo properties of its cluster members .
The cluster appears relaxed in its X-ray emission , but has significant amounts of intracluster light which is not centrally concentrated , suggesting that galaxy-scale interactions are still ongoing despite the overall relaxed state .
The cluster lenses 12 background galaxies into multiple images and one galaxy at z = 1.033 into a giant arc and its counterimage .
The multiple image positions and the surface brightness distribution ( SFB ) of the arc which is bent around several cluster members are sensitive to the cluster galaxy halo properties .
We model the cluster mass distribution with a NFW profile and the galaxy halos with two parameters for the mass normalization and extent of a reference halo assuming scalings with their observed NIR–light .
We match the multiple image positions at an r.m.s .
level of 0.85 \arcsec and can reconstruct the SFB distribution of the arc in several filters to a remarkable accuracy based on this cluster model .
The length scale where the enclosed galaxy halo mass is best constrained is about 5 effective radii – a scale in between those accessible to dynamical and field strong lensing mass estimates on one hand and galaxy–galaxy weak lensing results on the other hand .
The velocity dispersion and halo size of a galaxy with m _ { 160 W,AB } = 19.2 or M _ { B,Vega } = -20.7 are \sigma = 150 kms ^ { -1 } and r \approx 26 \pm 6 kpc , indicating that the halos of the cluster galaxies are tidally stripped .
We also reconstruct the unlensed source ( which is smaller by a factor of \sim 5.8 in area ) , demonstrating the increase of morphological information due to lensing and conclude that this galaxy has likely star–forming spiral arms with a red ( older ) central component .