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Dark-matter decays and Milky Way satellite galaxies

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arxiv 1009.1912 v1 pith:S4DTFCJF submitted 2010-09-09 astro-ph.GA hep-ph

Annika H. G. Peter , Andrew J. Benson This is my paper
classification astro-ph.GAhep-ph
keywords particleconstraintsdark-matterm300milkysatellitesatellitesalthough
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We consider constraints on a phenomenological dark-matter model consisting of two nearly degenerate particle species using observed properties of the Milky Way satellite galaxy population. The two parameters of this model, assuming the particle masses are >~ GeV, are v_k, the recoil speed of the daughter particle, and tau, the lifetime of the parent particle. The satellite constraint that spans the widest range of v_k is the number of satellites that have a mass within 300 pc M300 > 5 x 10^6 solar masses, although constraints based on M300 in the classical dwarfs and the overall velocity function are competitive for v_k >~ 50 km/s. In general, we find that tau <~ 30 Gyr is ruled out for 20 km/s <~ v_k <~ 200 km/s, although we find that the limits on tau for fixed v_k can change constraints by a factor of ~3 depending on the star-formation histories of the satellites. We advocate using the distribution of M300 in Milky Way satellites determined by next-generation all-sky surveys and follow-up spectroscopy as a probe of dark-matter properties.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Decaying Dark Matter Halo Abundance from a Revised Spherical Collapse Model

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    A mass-dependent collapse threshold from a revised spherical collapse model predicts the decaying-dark-matter halo mass function, matching N-body simulations at z≈1 and for mild kicks at z=0.

  2. A frequentist view on the two-body decaying dark matter model

    astro-ph.CO 2025-05 conditional novelty 6.0 of 10

    A frequentist reanalysis of Planck and KiDS-1000 data shows that a two-body decaying dark matter model can produce S8 values consistent with weak lensing surveys, and that prior choices dominated earlier Bayesian exclusions.

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