Jul 26 – 30, 2010
Montpellier 2 University
Europe/Paris timezone

Annihilation vs. Decay: Constraining Dark Matter Properties from a Gamma-Ray Detection in Dwarf Galaxies

Jul 27, 2010, 5:10 PM
Salle des Actes (Montpellier 2 University)

Salle des Actes

Montpellier 2 University

Place Eugene Bataillon, 34095 Montpellier Cedex 5 FRANCE


Dr Sergio Palomares-Ruiz (CFTP-IST)


Most proposed dark matter candidates are stable and are produced thermally in the early Universe. However, there is also the possibility of unstable dark matter, produced thermally or otherwise. We propose a strategy to distinguish between dark matter annihilation and/or decay in the case that a clear signal is detected in gamma-ray observations of Milky Way dwarf galaxies with gamma-ray experiments. The sole measurement of the energy spectrum of an indirect signal would render the discrimination between these cases impossible. We show that by examining the dependence of the intensity and energy spectrum on the angular distribution of the emission, the origin could be identified as decay, annihilation, or both. In addition, once the type of signal is established, we show how these measurements could help to extract information about the dark matter properties, including mass, annihilation cross section, lifetime, dominant annihilation and decay channels, and the presence of substructure.

Primary author

Dr Sergio Palomares-Ruiz (CFTP-IST)

Presentation materials