Sommerfeld-Enhanced $J$-Factors For Dwarf Spheroidal Galaxies

Understand

For models in which dark matter annihilation is Sommerfeld-enhanced, the annihilation cross section increases at low relative velocities.

• Dwarf spheroidal galaxies (dSphs) have low characteristic dark matter particle velocities and are thus ideal candidates to study such models.
• In this paper we model the dark matter phase space of dSphs as isotropic and spherically-symmetric, and determine the $J$-factors for several of the most important targets for indirect dark matter searches.
• For Navarro-Frenk-White density profiles, we quantify the scatter in the $J$-factor arising from the astrophysical uncertainty in the dark matter potential.