Interpretation of the Gamma-ray signal from the Galactic center

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Center, Bar, Circumnuclear Matter, And Bulge, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

Recent observations of the Galactic center with ground based gamma-ray instruments (CANGAROO-II, VERITAS, H.E.S.S.) have revealed a TeV (1012 eV) gamma-ray signal consistent with the position of Sgr A*. The observed energy spectrum and angular distribution of the excess could be explained by a massive Dark Matter candidate with a minimum mass of 13 TeV(90 % c.l.) and an upper limit on the WIMP density for r < 10 pc of 1309 Msolar pc-3 × (<σv>/3 . 10-26cm3s-1)-1/2 The angular distribution of the excess events is consistent with a cuspy profile with ρ(r) ~ r-α with α > 1 at a confidence level of 90 %. Even though the mass and the cross section of the Dark Matter constituents are unexpectedly high in the framework of most models of nonbaryonic Dark Matter, it can not be ruled out.

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