Résumé / Abstract Seminaire_GReCO

"Signature of dark matter in the extragalactic gamma-ray sky"

Shin'ichiro Ando
Gravitation AstroParticle Physics Amsterdam Inst. (GRAPPA) (Amsterdam, Pays-Bas)

One of the most important goals for modern cosmology in the coming decade is to reveal the nature of dark matter. Current and future generations of gamma-ray telescopes aim at achieving this goal by looking for gamma rays from dark matter annihilation. After giving brief overview of the latest observational results with Fermi-LAT, I will introduce results of our recent study on galaxy clusters and diffuse gamma-ray background as two potentially interesting target for dark matter searches. For the clusters, I discuss the importance of subhalos as well as effects of baryonic infall that modify the dark matter density profile, both of which largely boost the annihilation signals. For the diffuse gamma-ray background, I discuss the average intensity, small-scale anisotropy, and cross correlations, and their constraints on annihilation cross section.

lundi 25 novembre 2013 - 11:00
Salle des séminaires François Arago,
Institut d'Astrophysique de Paris

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