Hadronic-Origin TeV gamma-Rays and Ultra-High Energy Cosmic Rays from Centaurus A

Abstract

Centaurus A (Cen A) is the nearest radio-loud AGN and is detected from radio to very high energy gamma-rays. Its nuclear spectral energy distribution (SED) shows a double-peak feature, which is well explained by the leptonic synchrotron + synchrotron self-Compton model. This model however cannot account for the observed high energy photons in the TeV range, which display a distinct component. Here we show that ~ TeV photons can be well interpreted as the neutral pion decay products from p-gamma interactions of Fermi accelerated high energy protons in the jet with the seed photons around the second SED peak at ~170 keV. Extrapolating the inferred proton spectrum to high energies, we find that this same model is consistent with the detection of 2 ultra-high-energy cosmic ray events detected by Pierre Auger Observatory from the direction of Cen A. We also estimate the GeV neutrino flux from the same process, and find that it is too faint to be detected by current high-energy neutrino detectors.

Phys. Rev. D in press, This article supersedes arXiv:1007.0455

References in corpus (7)

• Ultra High Energy Cosmic Rays from Black Hole Jets of Radio Galaxies
• High energy radiation from Centaurus A
• Ultra-high energy Neutrinos from Centaurus A and the Auger hot spot
• High-Energy Emission Induced by Ultra-High-Energy Photons as a Probe of Ultra-High-Energy Cosmic-Ray Accelerators Embedded in the Cosmic Web
• VHE Gamma-Ray Induced Pair Cascades in the Radiation Fields of Dust Tori of AGN: Application to Cen A
• Gamma Rays from Centaurus A
• Multi-messenger astronomy with Centaurus A

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