Search for a Dark Matter annihilation signal from the Sagittarius dwarf galaxy with H.E.S.S

TL;DR

This study uses H.E.S.S. gamma-ray observations to search for dark matter annihilation signals in the Sagittarius dwarf galaxy, constraining particle models based on the non-detection.

Contribution

It provides the first detailed gamma-ray search for dark matter in Sagittarius dwarf using H.E.S.S. and models its halo profile with recent structural data.

Findings

No significant gamma-ray excess detected.

Constraints placed on dark matter annihilation cross sections.

Results limit certain supersymmetric and Kaluza-Klein models.

Abstract

Dwarf Spheroidal galaxies are amongst the best targets to search for a Dark Matter annihilation signal. The annihilation of WIMPs in the center of Sagittarius dwarf spheroidal (Sgr dSph) galaxy would produce high energy gamma-rays in the final state. Observations carried out with the H.E.S.S. array of Imaging Atmospheric Cherenkov telescopes are presented. A careful modelling of the Dark Matter halo profile of Sgr dwarf was performed using latest measurements on its structural parameters. Constraints on the velocity-weighted cross section of Dark Matter particles are derived in the framework of Supersymmetric and Kaluza-Klein models.