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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: We calculate for the nearest active galactic nucleus (AGN), Centaurus A,
the flux of high energy cosmic rays and of accompanying secondary photons and
neutrinos expected from hadronic interactions in the source. We use 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. While scattering on photons dominates in scenarios with acceleration
close to the core, scattering on gas becomes more important if acceleration takes place
along the jet. Normalizing the UHECR flux from Centaurus A to the observations
of the Auger experiment, the neutrino flux may be marginally observable in a 1 km3
neutrino telescope, if a steep UHECR flux dN/dE ∝ E −α with α = 2.7 extends down
to 1017 eV. The associated photon flux is close to or exceeds the observational data
of atmospheric Cherenkov and γ-ray telescopes for α > 2. In particular, we find that
∼
already present data favour either a softer UHECR injection spectrum than α = 2.7
for Centaurus A or a lower UHECR flux than expected from the normalization to the
Auger observations.