Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 73: Gammaastronomie II

T 73.3: Talk

Tuesday, March 4, 2008, 17:20–17:35, KGII-HS 2006

Position of the H.E.S.S. Galactic Centre Point Source — •Christopher van Eldik, Oliver Bolz, Isabel Braun, and German Hermann for the H.E.S.S. collaboration — MPI für Kernphysik, Heidelberg

Observations by the H.E.S.S. system of imaging atmospheric Cherenkov telescopes provide the most precise available very high energy (VHE) gamma-ray data on the Galactic Centre region in the energy range 150 GeV - 30 TeV. The vicinity of the kinetic centre of our galaxy harbours numerous objects which could potentially accelerate particles to VHE energies and thus produce the gamma-ray flux observed. The centroid of the point-like emission measured by H.E.S.S. is in good agreement with the position of the supermassive black hole Sgr A* and the recently discovered PWN G359.95-0.04.

In this contribution an update is given on the position of the H.E.S.S. Galactic Centre source using 2005/2006 data. The systematic pointing error is significantly reduced using guiding telescopes for pointing corrections, making it possible to exclude with high significance the supernova remnant Sgr A East as the source of the TeV gamma-rays.