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

Massey, R.; Harvey, D.; Liesenborgs, J.; Richard, J.; Stach, S.; Swinbank, M.; Taylor, P.; Williams, L.; Clowe, D.; Courbin, F.; Edge, A.; Israel, H.; Jauzac, M.; Joseph, R.; Jullo, E.; Kitching, T.D.; Leonard, A.; Merten, J.; Nagai, D.; Nightingale, J.; Robertson, A.; Romualdez, L.J.; Saha, P.; Smit, R.; Tam, S.-I.; Tittley, E.

doi:10.1093/mnras/sty630

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

Massey, R.; Harvey, D.; Liesenborgs, J.; Richard, J.; Stach, S.; Swinbank, M.; Taylor, P.; Williams, L.; Clowe, D.; Courbin, F.; Edge, A.; Israel, H.; Jauzac, M.; Joseph, R.; Jullo, E.; Kitching, T.D.; Leonard, A.; Merten, J.; Nagai, D.; Nightingale, J.; Robertson, A.; Romualdez, L.J.; Saha, P.; Smit, R.; Tam, S.-I.; Tittley, E.

Authors

Professor Richard Massey r.j.massey@durham.ac.uk
Professor

D. Harvey

J. Liesenborgs

J. Richard

S. Stach

M. Swinbank

P. Taylor

L. Williams

D. Clowe

F. Courbin

A. Edge

H. Israel

Professor Mathilde Jauzac mathilde.jauzac@durham.ac.uk
Professor

R. Joseph

E. Jullo

T.D. Kitching

A. Leonard

J. Merten

D. Nagai

J. Nightingale

A. Robertson

L.J. Romualdez

P. Saha

R. Smit

S.-I. Tam

E. Tittley

Abstract

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.

Citation

Massey, R., Harvey, D., Liesenborgs, J., Richard, J., Stach, S., Swinbank, M., …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), 669-677. https://doi.org/10.1093/mnras/sty630

Journal Article Type	Article
Acceptance Date	Mar 4, 2018
Online Publication Date	Apr 17, 2018
Publication Date	Jun 11, 2018
Deposit Date	May 16, 2018
Publicly Available Date	May 16, 2018
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	477
Issue	1
Pages	669-677
DOI	https://doi.org/10.1093/mnras/sty630

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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.