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In this work we analyze the mass distribution of MACSJ1206.2-0847, especiallyfocusing on the halo properties of its cluster members. The cluster appearsrelaxed in its X-ray emission, but has significant amounts of intraclusterlight which is not centrally concentrated, suggesting that galaxy-scaleinteractions are still ongoing despite the overall relaxed state. The clusterlenses 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 thesurface brightness distribution (SFB) of the arc which is bent around severalcluster members are sensitive to the cluster galaxy halo properties. We modelthe cluster mass distribution with a NFW profile and the galaxy halos with twoparameters for the mass normalization and extent of a reference halo assumingscalings with their observed NIR--light. We match the multiple image positionsat an r.m.s. level of $0.85\arcsec$ and can reconstruct the SFB distribution ofthe arc in several filters to a remarkable accuracy based on this clustermodel. The length scale where the enclosed galaxy halo mass is best constrainedis about 5 effective radii -- a scale in between those accessible to dynamicaland field strong lensing mass estimates on one hand and galaxy--galaxy weaklensing results on the other hand. The velocity dispersion and halo size of agalaxy with $m_{\rm 160W,AB}=19.2$ or $M_{\rm B,Vega}=-20.7$ are $\sigma=150\rm kms^{-1}$ and $r\approx 26\pm 6 \rm kpc$, indicating that the halos of thecluster galaxies are tidally stripped. We also reconstruct the unlensed source(which is smaller by a factor of $\sim5.8$ in area), demonstrating the increaseof morphological information due to lensing and conclude that this galaxy haslikely star--forming spiral arms with a red (older) central component.

Galaxy halo truncation and Giant Arc Surface Brightness Reconstruction in the Cluster MACSJ1206.2-0847