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44th Rencontres de Moriond - Very High Energy Phenomena in the Universe, La Thuile (Val d'Aosta) : Italie (2009)
Discovery of VHE gamma-rays from Centaurus A
M. Raue, J.-P. Lenain1, F. A. Aharonian, Y. Becherini2, C. Boisson1, A.-C. Clapson, L. Costamante, L. Gerard2, C. Medina1, M. De Naurois3, M. Punch2, F. Rieger, H. Sol, L. Stawarz, A. Zech1
HESS Collaboration(s)

We report the discovery of faint very high energy (VHE, E > 100 GeV) gamma-ray emission from the radio galaxy Centaurus A in deep observations performed with the H.E.S.S. experiment. A signal with a statistical significance of 5.0 sigma is detected from the region including the radio core and the inner kpc jets. The integral flux above an energy threshold of ~250 GeV is measured to be 0.8% of the flux of the Crab Nebula and the spectrum can be described by a power law with a photon index of 2.7 +/- 0.5_stat +/- 0.2_sys. No significant flux variability is detected in the data set. The discovery of VHE gamma-ray emission from Centaurus A reveals particle acceleration in the source to >TeV energies and, together with M 87, establishes radio galaxies as a class of VHE emitters.
1 :  LUTH - Laboratoire Univers et Théories
2 :  APC - UMR 7164 - AstroParticule et Cosmologie
3 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
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