Morphological peculiarities of high-redshift radio galaxies - The role of relativistic electrons

Astronomy and Astrophysics – Astronomy

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Galactic Evolution, Peculiar Galaxies, Radio Galaxies, Red Shift, Relativistic Particles, Compton Effect, Electron Distribution, Radio Sources (Astronomy)

Scientific paper

Five models to explain the peculiar optical and emission-line morphologies of high-redshift radio galaxies are discussed. The inverse Compton scattering model, bremsstrahlung and the line emission from clumped hot gas, jet-induced star formation, Thomson scattering of anisotropic light emitted by the AGN, and optical synchrotron radiation are considered. Relativistic electrons are argued to play an important role in the optical and emission-line properties of high-redshift radio galaxies via interactions between the relativistic electrons and the ambient gas, and via inverse Compton scattering of microwave background photons with the relativistic electrons. The environments of the radio galaxies and constraints on the orientation unified model for radio galaxies and radio-loud quasars are also discussed.

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