Multi-messenger astronomy with Centaurus A

Details Multi-messenger astronomy with Centaurus A Multi-messenger astronomy with Centaurus A

2009-04-03

arxiv.org/abs/0904.0590v1

Int.J.Mod.Phys.D18:1591-1595,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 6 figures. Contribution to the proceedings of the 2nd Heidelberg Workshop "High-Energy Gamma-rays and Neutrinos from

Scientific paper

10.1142/S0218271809015606

We calculated for the nearest active galactic nucleus (AGN), Centaurus A (Cen A), the flux of high energy cosmic rays and of accompanying secondary photons and neutrinos expected from hadronic interactions in the source. We used as two basic models for the generation of ultrahigh energy cosmic rays (UHECR) shock acceleration in the radio jet and acceleration in the regular electromagnetic field close to the core of the AGN, normalizing the UHECR flux to the observations of the Auger experiment. Here we compare the previously obtained photon fluxes with the recent data reported by the Fermi LAT and H.E.S.S. collaborations. In the case of the core model, we find good agreement both for the predicted spectral shape and the overall normalization between our earlier results and the H.E.S.S. observations for a primary proton energy $dN/dE\propto E^{-\alpha}$ with $\alpha\sim 2$ or smaller. A broken-power law with high-energy part $\alpha=-2.7$ leads to photon fluxes in excess of the Fermi measurements. The energy spectrum of the photon fluxes obtained by us for the jet scenario is in all cases at variance with the H.E.S.S. and Fermi observations.

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