2014

Mass-Galaxy offsets in Abell 3827, 2218 and 1689: intrinsic properties or line-of-sight substructures?

Mohammed, Irshad, Liesenborgs, Jori, Saha, Prasenjit et al.

Understand

We have made mass maps of three strong-lensing clusters, Abell 3827, Abell 2218 and Abell 1689, in order to test for mass-light offsets.

The technique used is GRALE, which enables lens reconstruction with minimal assumptions, and specifically with no information about the cluster light being given.
In the first two of these clusters, we find local mass peaks in the central regions that are displaced from the nearby galaxies by a few to several kpc.
These offsets {\em could\/} be due to line of sight structure unrelated to the clusters, but that is very unlikely, given the typical levels of chance line-of-sight coincidences in $\Lambda CDM$ simulations --- for Abell 3827 and Abell 2218 the offsets appear to be intrinsic.

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