Next ACϟJC: 22 May, 2017, Monday 11:00am

Post date: May 20, 2017 5:19:31 PM

Next Monday's meeting at UNESP, third floor.

Plenty of papers to discuss see

and our Astroparticle month continuing with

Lili Yang

visiting us from University of Nova Gorica.

She will be telling us about the "GeV excess at the Galactic Center" (abstract follows at the end of this email).

Please do not forget that there is still plenty of time to post your own paper, especially if you think that discussion is moving far away from your interests.

-----------------------------

Talk of the week by

Lili Yang (UNG)

Title:

"The GeV excess at the Galactic Center"

Abstract:

The Fermi collaboration recently characterized the Fermi Galactic center (GC) GeV excess with 6.5 years of data from the Fermi Large Area Telescope. As we know, the GC is of particular interest as it would be expected to have the brightest signal from annihilation of weakly interacting massive dark matter particles. In this study, they investigated the uncertainty of the GC excess spectrum and morphology due to uncertainties in cosmic-ray source distributions and propagation, uncertainties in the distribution of interstellar gas in the Milky Way, and uncertainties due to a potential contribution from the Fermi bubbles. Also uncertainties in the excess properties due to resolved point sources of gamma rays have been evaluated. However, control regions along the Galactic plane, where a dark-matter signal is not expected, show excesses of similar amplitude relative to the local background. Based on the magnitude of the systematic uncertainties, conservative upper limits for the annihilation cross section as function of particle mass and annihilation channel is reported here.