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Jul 5 – 12, 2017
Venice, Italy
Europe/Zurich timezone
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M31 gamma ray emission - a closer look at different explanations

Jul 6, 2017, 3:06 PM
Room Martinelli (Palazzo del Casinò)

Room Martinelli

Palazzo del Casinò

Parallel Talk Astroparticle Physics Astroparticle physics


Christopher Eckner (University of Nova Gorica)


A new measurement of a spatially extended gamma-ray signal from the center of M31
was published recently, reporting that the emission broadly resembles the so-called
Galactic center excess of the Milky Way (Ackermann et al. 2017, arXiv:1702.08602).
In this talk we discuss the possibilities that the signal originates from a
population of millisecond pulsars, or alternatively the annihilation of dark matter
particles. As an astrophysical interpretation in terms of millisecond pulsars
appears viable, we derive upper limits on the annihilation cross section in the
$b\bar{b}$/$\tau^-\tau^+-$channel of Weakly Interacting Massive Particles (WIMPs) in a mass range
from 1 GeV to 10 TeV, taking into consideration different spatial dark matter
density profiles and including the effect of substructure and adiabatic contraction.

Primary author

Christopher Eckner (University of Nova Gorica)


Presentation materials