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We present integral field spectroscopy of galaxy cluster Abell 3827, usingALMA and VLT/MUSE. It reveals an unusual configuration of strong gravitationallensing in the cluster core, with at least seven lensed images of a singlebackground spiral galaxy. Lens modelling based on HST imaging had suggestedthat the dark matter associated with one of the cluster's central galaxies maybe offset. The new spectroscopic data enable better subtraction of foregroundlight, and better identification of multiple background images. The inferreddistribution of dark matter is consistent with being centered on the galaxies,as expected by LCDM. Each galaxy's dark matter also appears to be symmetric.Whilst we do not find an offset between mass and light (suggestive ofself-interacting dark matter) as previously reported, the numerical simulationsthat have been performed to calibrate Abell 3827 indicate that offsets andasymmetry are still worth looking for in collisions with particular geometries.Meanwhile, ALMA proves exceptionally useful for strong lens imageidentifications.

Dark matter dynamics in Abell 3827: new data consistent with standard Cold Dark Matter