Physics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981fcph....7...59p&link_type=abstract
Fundamentals of Cosmic Physics, vol. 7, May 1981, p. 59-130.
Physics
8
Astronomical Models, Energy Dissipation, Radio Galaxies, Radio Observation, Adiabatic Conditions, Astronomical Spectroscopy, Bremsstrahlung, Faraday Effect, Gravitational Effects, Ionization, Magnetic Field Configurations, Polarized Radiation, Quasars, Self Absorption, Space Plasmas, Synchrotron Radiation
Scientific paper
The two main questions posed by radio galaxies (and quasars) are considered to be the energy supply within the nucleus and its transport into the extended radio volumes. The second question is discussed here by describing the observational properties of the extended sources and the knowledge of the physical conditions inside them, along with the theories proposed to explain their structure and evolution. In addition, the gross radio properties of galaxies are summarized, and the methods used to infer the physical conditions inside synchrotron sources are described. The energy losses of the relativistic electrons and the consequent spectral evolution are discussed, and a detailed account is given of the observed properties of the extended sources, which are then contrasted with the theoretical models discussed. With regard to the extended components of radio galaxies, it is noted that, on the observational side, an important cause of uncertainty is the still very approximate knowledge of certain basic physical parameters, such as the strength and structure of the magnetic field, the density, temperature, and space distribution of the thermal plasma, and the conditions around the radio volumes.
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