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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19141

Title: The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827
Authors: Massey, Richard
Williams, Liliya
Smit, Renske
Swinbank, Mark
Kitching, Thomas D.
Harvey, David
Jauzac, Mathilde
Israel, Holger
Clowe, Douglas
Edge, Alastair
Hilton, Matt
Jullo, Eric
Leonard, Adrienne
Liesenborgs, Jori
Merten, Julian
Mohammed, Irshad
Nagai, Daisuke
Richard, Johan
Robertson, Andrew
Saha, Prasenjit
Santana, Rebecca
Stott, John
Tittley, Eric
Issue Date: 2015
Publisher: OXFORD UNIV PRESS
Citation: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 449 (4), p. 3393-3406
Abstract: 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(-0.49)(+0.47) 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 sigma(DM)/(m) similar to (1.7 +/- 0.7) x 10(-4) cm(2) g(-1) x (t(infall)/10(9) yr)(-2), where t(infall) is the infall duration.
Notes: [Massey, Richard; Jauzac, Mathilde; Israel, Holger] Univ Durham, Inst Computat Cosmol, Durham DH1 3LE, England. [Massey, Richard; Smit, Renske; Swinbank, Mark; Edge, Alastair; Leonard, Adrienne; Robertson, Andrew; Stott, John] Univ Durham, Ctr Extragalact Astron, Durham DH1 3LE, England. [Williams, Liliya] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA. [Kitching, Thomas D.] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England. [Harvey, David] Ecole Polytech Fed Lausanne, Observ Sauverny, CH-1290 Versoix, Switzerland. [Jauzac, Mathilde; Hilton, Matt] Univ KwaZulu Natal, Sch Math Sci, Astrophys & Cosmol Res Unit, ZA-4041 Durban, South Africa. [Clowe, Douglas; Santana, Rebecca] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA. [Jullo, Eric] Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France. [Leonard, Adrienne] UCL, London WC1E 6BT, England. [Liesenborgs, Jori] Univ Hasselt, Expertisectr Digitale Media, B-3590 Diepenbeek, Belgium. [Merten, Julian] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA. [Merten, Julian] CALTECH, Pasadena, CA 91125 USA. [Mohammed, Irshad; Saha, Prasenjit] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland. [Nagai, Daisuke] Yale Univ, Dept Phys, New Haven, CT 06520 USA. [Richard, Johan] Univ Lyon 1, Observ Lyon, F-69561 St Genis Laval, France. [Tittley, Eric] Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland.
URI: http://hdl.handle.net/1942/19141
DOI: 10.1093/mnras/stv467
ISI #: 000355342000005
ISSN: 0035-8711
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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