Spectral Study of the HESS J1745-290 Gamma-Ray Source as Dark Matter Signal

TL;DR

This paper analyzes HESS gamma-ray data from the Galactic Center, proposing dark matter annihilation as a source and identifying potential WIMP candidates with masses above 10 TeV, consistent with observed spectra.

Contribution

It demonstrates that gamma-ray spectra from HESS can be explained by dark matter annihilation into Standard Model particles, providing specific candidate channels and mass estimates.

Findings

Best fits for gamma-ray spectra involve u/d quark-antiquark channels and WW/ZZ gauge bosons.

Derived WIMP mass is approximately above 10 TeV, below the unitarity limit.

Spectral index aligns with Fermi-LAT data from the same region.

Abstract

We study the main spectral features of the gamma-ray fluxes observed by the High Energy Stereoscopic System (HESS) from the J1745-290 Galactic Center source during the years 2004, 2005 and 2006. In particular, we show that these data are well fitted as the secondary gamma-rays photons generated from dark matter annihilating into Standard Model particles in combination with a simple power law background. We present explicit analyses for annihilation in a single standard model particle-antiparticle pair. In this case, the best fits are obtained for the u and d quark-antiquark channels and for the WW and ZZ gauge bosons, with background spectral index compatible with the Fermi-Large Area Telescope (LAT) data from the same region. The fits return a heavy WIMP, with a mass above 10 TeV approximately, but well below the unitarity limit for thermal relic annihilation.