Cores in warm dark matter haloes

A Catch 22 problem

Andrea Maccio, Sinziana Paduroiu, Donnino Anderhalden, Aurel Schneider, Ben Moore

    Research output: Contribution to journalArticle

    Abstract

    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∼ 10 10M ), a thermal candidate with mass as low as 0.1keV is required. This would fully prevent the formation of the dwarf galaxy in the first place. For candidates satisfying large-scale structure constraints (m ν larger than ≈1-2keV), the expected size of the core is of the order of 10 (20) pc for a dark matter halo with a mass of 10 10 (10 8) M . We conclude that 'standard' warm dark matter is not a viable solution for explaining the presence of cored density profiles in low-mass galaxies.

    Original languageEnglish (US)
    Pages (from-to)1105-1112
    Number of pages8
    JournalMonthly Notices of the Royal Astronomical Society
    Volume424
    Issue number2
    DOIs
    StatePublished - Aug 1 2012

    Fingerprint

    halos
    dark matter
    dwarf galaxies
    Liouville theorem
    space density
    simulation
    galaxies
    high resolution
    profiles

    Keywords

    • Dark matter
    • Galaxies: haloes

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Maccio, A., Paduroiu, S., Anderhalden, D., Schneider, A., & Moore, B. (2012). Cores in warm dark matter haloes: A Catch 22 problem. Monthly Notices of the Royal Astronomical Society, 424(2), 1105-1112. https://doi.org/10.1111/j.1365-2966.2012.21284.x

    Cores in warm dark matter haloes : A Catch 22 problem. / Maccio, Andrea; Paduroiu, Sinziana; Anderhalden, Donnino; Schneider, Aurel; Moore, Ben.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 424, No. 2, 01.08.2012, p. 1105-1112.

    Research output: Contribution to journalArticle

    Maccio, A, Paduroiu, S, Anderhalden, D, Schneider, A & Moore, B 2012, 'Cores in warm dark matter haloes: A Catch 22 problem', Monthly Notices of the Royal Astronomical Society, vol. 424, no. 2, pp. 1105-1112. https://doi.org/10.1111/j.1365-2966.2012.21284.x
    Maccio, Andrea ; Paduroiu, Sinziana ; Anderhalden, Donnino ; Schneider, Aurel ; Moore, Ben. / Cores in warm dark matter haloes : A Catch 22 problem. In: Monthly Notices of the Royal Astronomical Society. 2012 ; Vol. 424, No. 2. pp. 1105-1112.
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