  Observations of the Sagittarius dwarf spheroidal (Sgr dSph) galaxy were
carried out with the H.E.S.S. array of four imaging air Cherenkov telescopes in
June 2006. A total of 11 hours of high quality data are available after data
selection. There is no evidence for a very high energy gamma-ray signal above
the energy threshold at the target position. A 95% C.L. flux limit of 3.6 x
10-12 cm-2s-1 above 250 GeV has been derived. Constraints on the
velocity-weighted cross section <sigma v> are calculated in the framework of
Dark Matter particle annihilation using realistic models for the Dark Matter
halo profile of Sagittarius dwarf galaxy. Two different models have been
investigated encompassing a large class of halo types. A 95% C.L. exclusion
limit on <sigma v> of the order of 2 x 10-25 cm3s-1 is obtained for a core
profile in the 100 GeV - 1 TeV neutralino mass range.
