Very high energy gamma rays from the direction of Sagittarius A*
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(Published version)
Date
2004
Authors
Aharonian, F.
Akhperjanian, A.
Aye, K.
Bazer-Bachi, A.
Beilicke, M.
Benbow, W.
Berge, D.
Berghaus, P.
Bernlohr, K.
Bolz, O.
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Astronomy and Astrophysics (A & A), 2004; 425(1):L13-L17
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F. Aharonian...G. Rowell...et al.
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Abstract
We report the detection of a point-like source of very high energy (VHE) γ-rays coincident within 1′ of Sgr A*, obtained with the HESS array of Cherenkov telescopes. The γ-rays exhibit a power-law energy spectrum with a spectral index of -2.2 ± 0.09 × 0.15 and a flux above the 165 GeV threshold of (1.82 ± 0.22) × 10<sup>-7</sup> m<sup>-2</sup> s<sup>-1</sup>. The measured flux and spectrum differ substantially from recent results reported in particular by the CANGAROO collaboration.
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© The European Southern Observatory 2004