12-16 September 2016
CERN
Europe/Zurich timezone
There is a live webcast for this event.

The impact of axisymmetric halos on the upper limits on the dark matter annihilation cross section in dSphs

14 Sep 2016, 14:00
4h
500/1-201 - Mezzanine (CERN)

500/1-201 - Mezzanine

CERN

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Poster Contributions Dark matter (indirect detection) Poster Session (coffee at 15:00) & CERN Visit

Speaker

Niki Klop (GRAPPA, University of Amsterdam)

Description

Dwarf spheroidals (dSphs) are low-luminosity satellite galaxies of the Milky Way highly dominated by dark matter. Therefore, they are prime targets to search for signals from dark matter annihilation using gamma-ray observations. Recent stellar kinematical data show that the dark matter density profiles are better described by axisymmetric profiles than by the traditionally used spherically symmetric NFW profile. We performed an analysis of 7 classical dSphs, using PASS8 data of Fermi-LAT, adopting both the NFW profile and observationally motivated axisymmetric density profiles, and derived upper limits on the dark matter annihilation cross section. I will discuss the results for the different dSphs and show that the impact of axisymmetric profiles is very important. In some cases, the upper limits differ by a factor of 2-6.

Primary author

Niki Klop (GRAPPA, University of Amsterdam)

Co-authors

Fabio Zandanel (University of Amsterdam) Shin'ichiro Ando (University of Amsterdam)

Presentation Materials