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Dark matter dynamics in Abell 3827 : new data consistent with standard cold dark matter.

Massey, R. and Harvey, D. and Liesenborgs, J. and Richard, J. and Stach, S. and Swinbank, M. and Taylor, P. and Williams, L. and Clowe, D. and Courbin, F. and Edge, A. and Israel, H. and Jauzac, M. and Joseph, R. and Jullo, E. and Kitching, T. D. and Leonard, A. and Merten, J. and Nagai, D. and Nightingale, J. and Robertson, A. and Romualdez, L. J. and Saha, P. and Smit, R. and Tam, S.-I. and Tittley, E. (2018) 'Dark matter dynamics in Abell 3827 : new data consistent with standard cold dark matter.', Monthly notices of the Royal Astronomical Society., 477 (1). pp. 669-677.


We present integral field spectroscopy of galaxy cluster Abell 3827, using Atacama Large Millimetre Array (ALMA) and Very Large Telescope/Multi-Unit Spectroscopic Explorer. 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 Hubble Space Telescope 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. The inferred distribution of dark matter is consistent with being centred on the galaxies, as expected by Λ cold dark matter. Each galaxy's dark matter also appears to be symmetric. Whilst, we do not find an offset between mass and light (suggestive of self-interacting dark matter) as previously reported, the numerical simulations that have been performed to calibrate Abell 3827 indicate that offsets and asymmetry are still worth looking for in collisions with particular geometries. Meanwhile, ALMA proves exceptionally useful for strong lens image identifications.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:04 March 2018
Date deposited:16 May 2018
Date of first online publication:17 April 2018
Date first made open access:16 May 2018

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