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Properties of Local Group galaxies in hydrodynamical simulations of sterile neutrino dark matter cosmologies

Lovell, M.R.; Bose, S.; Boyarsky, A.; Crain, R.A.; Frenk, C.S.; Hellwing, W.A.; Ludlow, A.D.; Navarro, J.F.; Ruchayskiy, O.; Sawala, T.; Schaller, M.; Schaye, J.; Theuns, T.

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Authors

S. Bose

A. Boyarsky

R.A. Crain

W.A. Hellwing

A.D. Ludlow

J.F. Navarro

O. Ruchayskiy

T. Sawala

M. Schaller

J. Schaye



Abstract

We study galaxy formation in sterile neutrino dark matter models that differ significantly from both cold and from ‘warm thermal relic’ models. We use the EAGLE code to carry out hydrodynamic simulations of the evolution of pairs of galaxies chosen to resemble the Local Group, as part of the APOSTLE simulations project. We compare cold dark matter (CDM) with two sterile neutrino models with 7 keV mass: one, the warmest among all models of this mass (LA120) and the other, a relatively cold case (LA10). We show that the lower concentration of sterile neutrino subhaloes compared to their CDM counterparts makes the inferred inner dark matter content of galaxies like Fornax (or Magellanic Clouds) less of an outlier in the sterile neutrino cosmologies. In terms of the galaxy number counts, the LA10 simulations are indistinguishable from CDM when one takes into account halo-to-halo (or ‘simulation-to-simulation’) scatter. In order for the LA120 model to match the number of Local Group dwarf galaxies, a higher fraction of low-mass haloes is required to form galaxies than is predicted by the EAGLE simulations. As the census of the Local Group galaxies nears completion, this population may provide a strong discriminant between cold and warm dark matter models.

Citation

Lovell, M., Bose, S., Boyarsky, A., Crain, R., Frenk, C., Hellwing, W., …Theuns, T. (2017). Properties of Local Group galaxies in hydrodynamical simulations of sterile neutrino dark matter cosmologies. Monthly Notices of the Royal Astronomical Society, 468(4), 4285-4298. https://doi.org/10.1093/mnras/stx654

Journal Article Type Article
Acceptance Date Mar 14, 2017
Online Publication Date Mar 16, 2017
Publication Date Jul 11, 2017
Deposit Date Jul 18, 2017
Publicly Available Date Jul 18, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 468
Issue 4
Pages 4285-4298
DOI https://doi.org/10.1093/mnras/stx654
Public URL https://durham-repository.worktribe.com/output/1352862

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.






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