Mathematics – Probability
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..152c&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Feb. 1986, p. 152-158.
Mathematics
Probability
1
Galactic Nuclei, Galactic Radiation, Radio Sources (Astronomy), Light Curve, Low Frequencies, Probability Distribution Functions, Quasars, Radio Galaxies, Radio Jets (Astronomy), Synchrotron Radiation
Scientific paper
Radio characteristics of galactic nuclei, providing such unique information as spectral data on source variability, and the long-term history of the central engine and its duration of activity and total energy, are reviewed. The compact radio source characteristics are complicated by orientation-dependent relativistic beaming and by refractive focusing in the interstellar medium. Incoherent synchrotron radiation is thought to be the emission mechanism, with the result that synchrotron self-absorption in compact sources hides the central engine from direct radio observation. However, the history revealed by the extended jets and lobes of radio galaxies and quasars favors a single massive object not supported by radiation pressure, either a spinar or a black hole, as the energy source in radio-galaxy nuclei.
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