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Discovery of VHE gamma-rays from Centaurus A

Abstract : 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.
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Contributor : Simone Lantz <>
Submitted on : Monday, April 27, 2009 - 4:23:22 PM
Last modification on : Thursday, January 7, 2021 - 5:56:02 PM

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M. Raue, J.-P. Lenain, F. A. Aharonian, Y. Becherini, C. Boisson, et al.. Discovery of VHE gamma-rays from Centaurus A. 44th Rencontres de Moriond - Very High Energy Phenomena in the Universe, 2009, La Thuile (Val d'Aosta), Italy. ⟨in2p3-00379110⟩



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