On velocity-dependent dark matter annihilations in dwarf satellites

Understand

Milky Way dwarf spheroidal satellites are a prime target for Dark Matter (DM) indirect searches.

• There have been recent reassessments of the expected DM gamma-ray signals in case of long-range interactions, commonly known as Sommerfeld enhancement.
• Since details of the underlying DM phase-space distribution function become critical, there are potentially large uncertainties in the final result.
• We provide here a first attempt towards a comprehensive investigation of these systematics, addressing the impact on the expected DM flux from Milky Way dwarfs via Bayesian inference on the available stellar kinematic datasets.