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The matter environment of galaxies is connected to the physics of galaxyformation and evolution. Utilising galaxy-galaxy-galaxy lensing as a directprobe, we map out the distribution of correlated surface mass-density aroundgalaxy pairs for different lens separations in the Canada-France-HawaiiTelescope Lensing Survey (CFHTLenS). We compare, for the first time, theseso-called excess mass maps to predictions provided by a recent semi-analyticmodel, which is implanted within the dark-matter Millennium Simulation. Weanalyse galaxies with stellar masses between $10^9-10^{11}\,{\rm M}_\odot$ intwo photometric redshift bins, for lens redshifts $z\lesssim0.6$, focusing onpairs inside groups and clusters. To allow us a better interpretation of themaps, we discuss the impact of chance pairs, i.e., galaxy pairs that appearclose to each other in projection only. Our tests with synthetic datademonstrate that the patterns observed in the maps are essentially produced bycorrelated pairs that are close in redshift ($\Delta z\lesssim5\times10^{-3}$).We also verify the excellent accuracy of the map estimators. In an applicationto the galaxy samples in the CFHTLenS, we obtain a $3\sigma-6\sigma$significant detection of the excess mass and an overall good agreement with thegalaxy model predictions. There are, however, a few localised spots in the mapswhere the observational data disagrees with the model predictions on a$\approx3.5\sigma$ confidence level. Although we have no strong indications forsystematic errors in the maps, this disagreement may be related to the residualB-mode pattern observed in the average of all maps. Alternatively, misalignedgalaxy pairs inside dark matter halos or lensing by a misaligned distributionof the intra-cluster gas might also cause the unanticipated bulge in thedistribution of the excess mass between lens pairs.

A comparison of the excess mass around CFHTLenS galaxy-pairs to predictions from a semi-analytic model using galaxy-galaxy-galaxy lensing