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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

The H Collaboration (2008)

Localising the HESS galactic centre point source

Journal of Physics Conference Series, 110:062003-+.

Observations by the H.E.S.S. system of imaging atmospheric Cherenkov telescopes provide the most sensitive measurement of the Galactic Center 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 very high energies (VHE, > 100 GeV) and thus produce the gamma-ray flux observed. The centroid of the point-like emission measured by H.E.S.S. was found to be in good agreement with the position of the supermassive black hole Sgr A* and the recently discovered PWN candidate G359.95-0.04. Given a systematic pointing error of about 30", a possible association with the SNR Sgr A East could not be ruled out with 2004 H.E.S.S. data. 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 reduced to 6'' per axis using guiding telescopes for pointing corrections, making it possible to exclude with high significance Sgr A East as the source of the VHE gamma-rays.

Provided by the SAO/NASA Astrophysics Data System