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15-16 janvier 2015
Institut Henri Poincaré
Fuseau horaire Europe/Paris

The gamma-ray excess at the Galactic Center and the antiproton constraints.

16 janv. 2015 à 11:30
14m
Chair: Yann Mambrini, Amphi Hermite (Institut Henri Poincaré)

Chair: Yann Mambrini, Amphi Hermite

Institut Henri Poincaré

11, rue Pierre et Marie Curie 75005 Paris

Orateur

Marco Taoso (IPhT Saclay/CEA)

Description

A GeV gamma-ray excess has possibly been individuated in Fermi-LAT data from the Galactic Center and interpreted in terms of Dark Matter annihilations, either in hadronic or leptonic channels. In order to test this tantalizing interpretation, we address two issues: (i) we improve the computation of secondary emission from DM, confirming it to be very relevant for determining the DM spectrum in the leptonic channels, (ii) we consider the constraints from antiprotons on the DM hadronic channel, finding that the uncertainties on the propagation model and the solar modulation play a major role. The limits that we obtain severely constrain the DM interpretation of the excess in the hadronic channel, for standard assumptions on the Galactic propagation parameters and solar modulation. However, they considerably relax if more conservative choices are adopted.

Auteur principal

Marco Taoso (IPhT Saclay/CEA)

Documents de présentation

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