Remnants of Galactic subhalos and their impact on indirect dark matter searches

Abstract

Dark matter subhalos, predicted in large numbers in the cold dark matter scenario, should have an impact on particle dark matter searches. Recent results show that tidal disruption of these objects in computer simulations is over-efficient due to numerical artifacts and resolution effects. Accounting for these results, we re-estimate the subhalo abundance in the Milky Way using semi-analytical techniques. In particular, we show that the boost factor for gamma rays and cosmic-ray antiprotons is increased by roughly a factor of two.

arXiv commentv1: 17 pages, 13 figures, invited contribution submitted to Galaxies, Special Issue "The Role of Halo Substructure in Gamma-Ray Dark Matter Searches" v2: minor changes, matches the published version

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Cited by in corpus (14)

• Can tides disrupt cold dark matter subhaloes?
• The asymptotic tidal remnants of cold dark matter subhalos
• Mass loss in tidally stripped systems; the energy-based truncation method
• Tidal evolution of dark matter annihilation rates in subhalos
• Evolution of dark matter microhalos through stellar encounters
• Investigating the detection of dark matter subhalos as extended sources with Fermi-LAT
• Impact of substructure on local dark matter searches
• Gamma-ray sensitivity to dark matter subhalo modelling at high latitudes
• A universal model for the evolution of tidally stripped systems
• Classification of gamma-ray targets for velocity-dependent and subhalo-boosted dark-matter annihilation
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• Analytical insight into dark matter subhalo boost factors for Sommerfeld-enhanced $s$- and $p$-wave $\gamma$-ray signals
• Impact of baryons on the population of Galactic subhalos and implications for dark matter searches