TeV gamma-rays from UHECR interactions in AGN cores: Lessons from Centaurus A

Abstract

TeV gamma-rays have been observed from blazars as well as from radio galaxies like M87 and Cen A. In leptonic models, gamma-rays above the pair production threshold can escape from the ultra-relativistic jet, since large Lorentz factors reduce the background photon densities compared to those required for isotropic emission. Here we discuss an alternative scenario, where VHE photons are generated as secondaries from UHECR interaction in the AGN core. We show that TeV gamma-rays can escape from the core despite large IR and UV backgrounds. For the special case of Cen A, we study if the various existing observations from the far infra-red to the UHE range can be reconciled within this picture.

7 pages, 11 eps figures; v2: to appear in a special Cen A issue of PASA

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Cited by in corpus (16)

• Particle acceleration in relativistic outflows
• The radio continuum structure of Centaurus A at 1.4 GHz
• Evidence for a second component in the high-energy core emission from Centaurus A?
• A minimal model for extragalactic cosmic rays and neutrinos
• The $\gamma$-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT
• Radio Galaxies at VHE energies
• Non-thermal Processes in Black-Hole-Jet Magnetospheres
• One-zone SSC model for the core emission of Centaurus A revisited
• Multi-TeV flaring from blazars: Markarian 421 a case study
• Particle Acceleration and gamma-ray emission due to magnetic reconnection around the core region of radio galaxies
• Review of the Multimessenger Working Group at UHECR-2012
• Gamma-Rays from Non-Blazar AGN
• Report from the Multi-Messenger Working Group at UHECR-2014 Conference
• High Energy Neutrinos and Cosmic Rays
• Science Drivers for AGN Observations with the Cherenkov Telescope Array
• Explaining the UHECR spectrum, composition and large-scale anisotropies with radio galaxies