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

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http://hdl.handle.net/10138/183649

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Schewtschenko , J A , Baugh , C M , Wilkinson , R J , Boehm , C , Pascoli , S & Sawala , T 2016 , ' Dark matter-radiation interactions : the structure of Milky Way satellite galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 461 , no. 3 , pp. 2282-2287 . https://doi.org/10.1093/mnras/stw1078

Title: Dark matter-radiation interactions : the structure of Milky Way satellite galaxies
Author: Schewtschenko, J. A.; Baugh, C. M.; Wilkinson, R. J.; Boehm, C.; Pascoli, S.; Sawala, T.
Contributor: University of Helsinki, Department of Physics
Date: 2016-09-21
Language: eng
Number of pages: 6
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/183649
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., 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.
Subject: astroparticle physics
galaxies: haloes
Local Group
dark matter
large-scale structure of Universe
COSMOLOGICAL SIMULATIONS
MASS CONSTRAINTS
HALOES
SUBSTRUCTURE
COLD
PHOTOIONIZATION
SUBHALOES
PROJECT
BARYONS
WARM
115 Astronomy, Space science
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