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

Understand

We present integral field spectroscopy of galaxy cluster Abell 3827, using ALMA and VLT/MUSE.

• It reveals an unusual configuration of strong gravitational lensing in the cluster core, with at least seven lensed images of a single background spiral galaxy.
• Lens modelling based on HST imaging had suggested that the dark matter associated with one of the cluster's central galaxies may be offset.
• The new spectroscopic data enable better subtraction of foreground light, and better identification of multiple background images.