Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-18
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, conference logo, contribution to the 30th International Cosmic Ray Conference in Merida, Mexico, July 2007
Scientific paper
Jets of Active Galactic Nuclei (AGN) are established emitters of very high energy (VHE; >100 GeV) gamma-rays. VHE radiation is also expected to be emitted from the vicinity of super-massive black holes (SMBH), irrespective of their activity state. Accreting SMBH rotate and generate a dipolar magnetic field. In the magnetosphere of the spinning black hole, acceleration of particles can take place in the field gaps. VHE emission from these particles is feasible via leptonic or hadronic processes. Therefore quiescent systems, where the lack of a strong photon field allows the VHE emission to escape, are candidates for emission. The H.E.S.S. experiment has observed the passive SMBH in the nearby galaxy NGC 1399. No VHE gamma-ray signal is observed from the galactic nucleus. Constraints set by the NGC 1399 observations are discussed in the context of different mechanisms for the production of VHE gamma-ray emission.
Benbow Wystan
HESS collaboration for the
Pedaletti G.
Wagner Stefan
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