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A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827.

Taylor, P. and Massey, R. and Jauzac, M. and Courbin, F. and Harvey, D. and Joseph, R. and Robertson, A. (2017) 'A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827.', Monthly notices of the Royal Astronomical Society., 468 (4). pp. 5004-5013.


Simulations of self-interacting dark matter predict that dark matter should lag behind galaxies during a collision. If the interaction is mediated by a high-mass force carrier, the distribution of dark matter can also develop asymmetric dark matter tails. To search for this asymmetry, we compute the gravitational lensing properties of a mass distribution with a free skewness parameter. We apply this to the dark matter around the four central galaxies in cluster Abell 3827. In the galaxy whose dark matter peak has previously been found to be offset, we tentatively measure a skewness s=0.23+0.05−0.22 s=0.23−0.22+0.05 in the same direction as the peak offset. Our method may be useful in future gravitational lensing analyses of colliding galaxy clusters and merging galaxies.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:04 April 2017
Date deposited:18 July 2017
Date of first online publication:06 April 2017
Date first made open access:18 July 2017

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