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The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827

Massey, Richard and Williams, Liliya and Smit, Renske and Swinbank, Mark and Kitching, Thomas D. and Harvey, David and Jauzac, Mathilde and Israel, Holger and Clowe, Douglas and Edge, Alastair and Hilton, Matt and Jullo, Eric and Leonard, Adrienne and Liesenborgs, Jori and Merten, Julian and Mohammed, Irshad and Nagai, Daisuke and Richard, Johan and Robertson, Andrew and Saha, Prasenjit and Santana, Rebecca and Stott, John and Tittley, Eric (2015) The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827. Monthly Notices of the Royal Astronomical Society, 449 (4). pp. 3393-3406. ISSN 0035-8711.

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Galaxy cluster Abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10 kpc. Such corrugation of the stellar distribution is very rare, and suggests recent formation by several simultaneous mergers. We map the distribution of associated dark matter, using new Hubble Space Telescope imaging and Very Large Telescope/Multi-Unit Spectroscopic Explorer integral field spectroscopy of a gravitationally lensed system threaded through the cluster core. We find that each of the central galaxies retains a dark matter halo, but that (at least) one of these is spatially offset from its stars. The best-constrained offset is 1.62^(+0.47)_(−0.49) kpc, where the 68 per cent confidence limit includes both statistical error and systematic biases in mass modelling. Such offsets are not seen in field galaxies, but are predicted during the long infall to a cluster, if dark matter self-interactions generate an extra drag force. With such a small physical separation, it is difficult to definitively rule out astrophysical effects operating exclusively in dense cluster core environments – but if interpreted solely as evidence for self-interacting dark matter, this offset implies a cross-section σ_(DM)/m ∼ (1.7 ± 0.7) × 10^(−4) cm^2 g^(−1) × (t_(infall)/10^9 yr)^(−2), where t_(infall) is the infall duration.

Item Type:Article
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URLURL TypeDescription Paper
Massey, Richard0000-0002-6085-3780
Smit, Renske0000-0001-8034-7802
Jullo, Eric0000-0002-9253-053X
Nagai, Daisuke0000-0002-6766-5942
Richard, Johan0000-0001-5492-1049
Alternate Title:The behaviour of dark matter associated with 4 bright cluster galaxies in the 10kpc core of Abell 3827
Additional Information:© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 March 2. Received 2015 March 2; in original form 2014 December 4. First published online April 14, 2015. The authors are pleased to thank Jay Anderson for advice with CTI correction for HST/WFC3, Jean-Paul Kneib for advice using LENSTOOL, and the anonymous referee whose suggestions improved the manuscript. RM and TDK are supported by Royal Society University Research Fellowships. This work was supported by the Science and Technology Facilities Council (grant numbers ST/L00075X/1, ST/H005234/1 and ST/I001573/1) and the Leverhulme Trust (grant number PLP-2011-003). This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Facilities: This paper uses data from observations GO-12817 (PI: R. Massey) with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA Inc, under NASA contract NAS 5-26555. This paper also uses data from observations made with ESO Telescopes at the La Silla Paranal Observatory under programmes 093.A-0237 and 294.A-5014 (PI: R. Massey). We thank the Director General for granting discretionary time, and Paranal Science Operations for running the observations. The LENSTOOL analysis used the DiRAC Data Centric system at Durham University, operated by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility ( This equipment was funded by BIS National E-infrastructure capital grant ST/K00042X/1, STFC capital grant ST/H008519/1, and STFC DiRAC Operations grant ST/K003267/1 and Durham University. DiRAC is part of the National e-Infrastructure. LLRW would like to acknowledge the Minnesota Supercomputing Institute, without whose computational support GRALE work would not have been possible.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/L00075X/1
Science and Technology Facilities Council (STFC)ST/H005234/1
Science and Technology Facilities Council (STFC)ST/I001573/1
Leverhulme TrustPLP-2011-003
NASANAS 5-26555
Science and Technology Facilities Council (STFC)ST/K00042X/1
Science and Technology Facilities Council (STFC)ST/H008519/1
Science and Technology Facilities Council (STFC)ST/K003267/1
Durham UniversityUNSPECIFIED
Subject Keywords: astroparticle physics gravitational lensing: strong galaxies: clusters: individual: Abell 3827 dark matter
Issue or Number:4
Record Number:CaltechAUTHORS:20150626-101318427
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Official Citation:Richard Massey, Liliya Williams, Renske Smit, Mark Swinbank, Thomas D. Kitching, David Harvey, Mathilde Jauzac, Holger Israel, Douglas Clowe, Alastair Edge, Matt Hilton, Eric Jullo, Adrienne Leonard, Jori Liesenborgs, Julian Merten, Irshad Mohammed, Daisuke Nagai, Johan Richard, Andrew Robertson, Prasenjit Saha, Rebecca Santana, John Stott, and Eric Tittley The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827 MNRAS (June 01, 2015) Vol. 449 3393-3406 doi:10.1093/mnras/stv467 First published online April 14, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58633
Deposited By: Ruth Sustaita
Deposited On:26 Jun 2015 17:53
Last Modified:09 Mar 2020 13:19

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