Beam models for extragalactic radio sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Beams (Radiation), Radio Galaxies, Constraints, Galactic Structure, Radio Spectra

Scientific paper

Beam models for radio galaxies are addressed. The spectra of radio galaxies are first discussed briefly, and then the structure and size of these objects are considered. The morphology of lobes and jets in radio galaxies is described and the total energy requirements which models of these galaxies must satisfy are pointed out. Three basic constraints which any such model must satisfy are given, and two important models are described: the 'twin exhaust' model of Blandford and Rees (1974) and the accretion disk model of Blandford (1976) and Lovelace (1976). The interaction of the jets with the integalactic medium, resulting in the formation of hot spots and synchrotron radiation, is described.

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