Speaker
Description
Speaker: Ilias Cholis
Abstract: I will discuss about recent results and ongoing studies of the gamma-ray sky from low latitudes and up to 60 degrees in latitude and at energies between 0.3 to 900 GeV. With my collaborators we search for a possible emission signal from dark matter within the inner 10 kiloparsec of the Milky Way. That includes the Inner Galaxy and the region of the Galactic Stellar Halo. We model the galactic diffuse emission, the isotropic extragalactic gamma-ray background, the known emission from Fermi Bubbles and from Loop I and properly mask the Fermi-LAT Collaboration point sources. Recent studies of Galactic surveys, such as Gaia, have revealed that the Milky Way’s gravitational potential comes from a matter distribution that is triaxial and rotated with respect to the Galactic center-Sun axis. I will present results where we tested if the morphology of the Galactic Center Excess (GCE) is compatible with a dark matter annihilation signal coming with a triaxial dark matter halo (titled and untitled to the Sun-Galactic Center axis). We find that the GCE spectrum and inner cuspiness are robust against variations in the triaxiality and tilt of the dark matter halo. In terms of its overall morphology, the GCE in the gamma-ray data can discriminate between choices for the dark matter halo’s triaxiality and
tilt. Finally, I will present preliminary results on tests on a recent claim in the literature of an emission at high latitudes that is compatible with a dark matter annihilation signal, beyond the more well known GCE.