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Dark matter–radiation interactions : the structure of Milky Way satellite galaxies.

Schewtschenko, J. A. and Baugh, C. M. and Wilkinson, R. J. and Boehm, C. and Pascoli, S. and Sawala, T. (2016) 'Dark matter–radiation interactions : the structure of Milky Way satellite galaxies.', Monthly notices of the Royal Astronomical Society., 461 (3). pp. 2282-2287.

Abstract

In the thermal dark matter (DM) paradigm, primordial interactions between DM and Standard Model particles are responsible for the observed DM relic density. In Boehm et al. (2014), we showed that weak-strength interactions between DM and radiation (photons or neutrinos) can erase small-scale density fluctuations, leading to a suppression of the matter power spectrum compared to the collisionless cold DM (CDM) model. This results in fewer DM subhaloes within Milky Way-like DM haloes, implying a reduction in the abundance of satellite galaxies. Here we use very high resolution N-body simulations to measure the dynamics of these subhaloes. We find that when interactions are included, the largest subhaloes are less concentrated than their counterparts in the collisionless CDM model and have rotation curves that match observational data, providing a new solution to the “too big to fail” problem.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/mnras/stw1078
Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:04 May 2016
Date deposited:16 June 2016
Date of first online publication:06 May 2016
Date first made open access:No date available

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