H.E.S.S. observations of the Galactic Center region and their possible dark matter interpretation

Details H.E.S.S. observations of the Galactic Center region and their possible dark matter interpretation H.E.S.S. observations of the Galactic Center region and their possible dark matter interpretation

2006-10-17

arxiv.org/abs/astro-ph/0610509v2

Phys.Rev.Lett.97:221102,2006; Erratum-ibid.97:249901,2006

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, published in Physical Review Letters Correct some references The accepted version set on astro-ph was slig

Scientific paper

10.1103/PhysRevLett.97.221102

The detection of gamma-rays from the source HESS J1745-290 in the Galactic Center (GC) region with the H.E.S.S. array of Cherenkov telescopes in 2004 is presented. After subtraction of the diffuse gamma-ray emission from the GC ridge, the source is compatible with a point-source with spatial extent less than 1.2'(stat.) (95% CL). The measured energy spectrum above 160 GeV is compatible with a power-law with photon index of 2.25 +/- 0.04(stat.) +/- 0.10 (syst.) and no significant flux variation is detected. These measurements are discussed in the framework of dark matter annihilation. It is found that the bulk of the VHE emission must have non-dark-matter origin. Loose constraints on the velocity-weighted annihilation cross section are derived assuming the presence of an astrophysical non-dark-matter gamma-ray contribution.

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