Decaying dark matter in dwarf spheroidal galaxies: Prospects for X-ray and gamma-ray telescopes

Understand

Dwarf spheroidal galaxies are dark matter dominated systems, and as such, ideal for indirect dark matter searches.

• If dark matter decays into high-energy photons in the dwarf galaxies, they will be a good target for current and future generations of X-ray and gamma-ray telescopes.
• By adopting the latest estimates of density profiles of dwarf galaxies in the Milky Way, we revise the estimates dark matter decay rates in dwarf galaxies; our results are more robust, but weaker than previous estimates.
• Applying these results, we study the detectability of dark matter decays with X-ray and very-high-energy gamma-ray telescopes, such as eROSITA, XRISM, Athena, HAWC, and CTA.