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We present a weak lensing analysis of the double cluster system Abell 222 andAbell 223. The lensing reconstruction shows evidence for a possible dark matterfilament connecting both clusters. The case for a filamentary connectionbetween A 222/223 is supported by an analysis of the galaxy density and X-rayemission between the clusters. Using the results of N-body simulations, we tryto develop a criterion that separates this system into cluster and filamentregions. The aim is to find a technique that allows the quantification of thesignificance of (weak lensing) filament candidates in close pairs of clusters.While this mostly fails, the aperture quadrupole statistics (Schneider &Bartelmann 1997) shows some promise in this area. The cluster masses determinedfrom weak lensing in this system are considerably lower than those previouslydetermined from spectroscopic and X-ray observations (Dietrich et al. 2002;Proust et al. 2000; Wang et al. 1999). Additionally, we report theserendipitous weak lensing detection of a previously unknown cluster in thefield of this double cluster system.

Weak lensing study of dark matter filaments and application to the binary cluster A 222 and A 223