Non-thermal emission in lobes of radio galaxies: III. 3C 98, Pictor A, DA 240, Cygnus A, 3C 326, and 3C 236

Abstract

Recent analyses of the broad spectral energy distributions (SED) of extensive lobes of local radio-galaxies have confirmed the leptonic origin of their Fermi/LAT gamma-ray emission, significantly constraining the level of hadronic contribution. SED of distant (D > 125 Mpc) radio-galaxy lobes are currently limited to the radio and X-ray bands, hence give no information on the presence of non-thermal (NT) protons but are adequate to describe the properties of NT electrons. Modeling lobe radio and X-ray emission in 3C 98, Pictor A, DA 240, Cygnus A, 3C 326, and 3C 236, we fully determine the properties of intra-lobe NT electrons and estimate the level of the related gamma-ray emission from Compton scattering of the electrons off the superposed Cosmic Microwave Background, Extragalactic Background Light, and source-specific radiation fields.

8 pages, 4 figures; a few typos corrected; several missing references added

References in corpus (9)

• The extragalactic background light revisited and the cosmic photon-photon opacity
• Planetary nebulae as tracers of galaxy stellar populations
• The Cavity of Cygnus A
• Shocked Molecular Hydrogen in the 3C 326 Radio Galaxy System
• The AMIGA sample of isolated galaxies III. IRAS data and infrared diagnostics
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