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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 660816.0, MPI für Astronomie / Publikationen_mpia
Cores in warm dark matter haloes: a Catch 22 problem
Authors:Macciò, Andrea V.; Paduroiu, Sinziana; Anderhalden, Donnino; Schneider, Aurel; Moore, Ben
Date of Publication (YYYY-MM-DD):2012
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Volume:424
Issue / Number:2
Start Page:1105
End Page:1112
Review Status:not specified
Audience:Not Specified
Abstract / Description:The free streaming of warm dark matter particles dampens the fluctuation spectrum, flattens the mass function of haloes and sets a fine-grained phase density limit for dark matter structures. The phase-space density limit is expected to imprint a constant-density core at the halo centre in contrast to what happens for cold dark matter. We explore these effects using high-resolution simulations of structure formation in different warm dark matter scenarios. We find that the size of the core we obtain in simulated haloes is in good agreement with theoretical expectations based on Liouville's theorem. However, our simulations show that in order to create a significant core (? kpc) in a dwarf galaxy (M˜ 1010 M&sun;), a thermal candidate with mass as low as 0.1 keV is required. This would fully prevent the formation of the dwarf galaxy in the first place. For candidates satisfying large-scale structure constraints (mν larger than ≈1-2 keV), the expected size of the core is of the order of 10 (20) pc for a dark matter halo with a mass of 1010 (108) M&sun;. We conclude that 'standard' warm dark matter is not a viable solution for explaining the presence of cored density profiles in low-mass galaxies.
Free Keywords:galaxies: haloes; dark matter
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012MNRAS.424.1105M [ID No:1]
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