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.

Schewtschenko JA, Baugh CM, Wilkinson RJ, 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, 461(3), 2282-2287 [10.1093/mnras/stw1078].

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

Pascoli S;
2016

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.
2016
Schewtschenko JA, Baugh CM, Wilkinson RJ, 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, 461(3), 2282-2287 [10.1093/mnras/stw1078].
Schewtschenko JA; Baugh CM; Wilkinson RJ; Boehm C; Pascoli S; Sawala T
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/809123
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