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The diverse density profiles of galaxy clusters with self-interacting dark matter plus baryons.

Robertson, Andrew and Massey, Richard and Eke, Vincent and Tulin, Sean and Yu, Hai-Bo and Bahé, Yannick and Barnes, David J and Bower, Richard G and Crain, Robert A and Dalla Vecchia, Claudio and Kay, Scott T and Schaller, Matthieu and Schaye, Joop (2018) 'The diverse density profiles of galaxy clusters with self-interacting dark matter plus baryons.', Monthly notices of the Royal Astronomical Society : letters., 476 (1). L20-L24.


We present the first simulated galaxy clusters (M200 > 1014 M⊙) with both self-interacting dark matter (SIDM) and baryonic physics. They exhibit a greater diversity in both dark matter and stellar density profiles than their counterparts in simulations with collisionless dark matter (CDM), which is generated by the complex interplay between dark matter self-interactions and baryonic physics. Despite variations in formation history, we demonstrate that analytical Jeans modelling predicts the SIDM density profiles remarkably well, and the diverse properties of the haloes can be understood in terms of their different final baryon distributions.

Item Type:Article
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:30 January 2018
Date deposited:30 March 2018
Date of first online publication:16 February 2018
Date first made open access:No date available

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