On the problems associated with the rapidly varying compact nonthermal sources

Details On the problems associated with the rapidly varying compact nonthermal sources On the problems associated with the rapidly varying compact nonthermal sources

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975coasp...6...87b&link_type=abstract

Comments on Modern Physics, Part C - Comments on Astrophysics and Space Physics and Space Physics, vol. 6, Nov. 1975, p. 87-94.

Astronomy and Astrophysics

Astronomy

6

Extragalactic Radio Sources, Nonthermal Radiation, Quasars, Radiant Flux Density, Radio Galaxies, Angular Distribution, Astronomical Models, Compton Effect, Infrared Astronomy, Luminous Intensity, Peculiar Galaxies

Scientific paper

Difficulties and possible interpretations are discussed for observations of extragalactic compact nonthermal radio sources. The sources considered are those which have been identified optically with normal and peculiar galaxies, quasars, N galaxies, and BL Lacertae objects. Optical, infrared, and radio flux variations in different sources are noted along with difficulties associated with determining angular sizes from interferometric measurements. It is suggested that the ultimate origin of the infrared flux is probably a nonthermal synchrotron mechanism in some sources and absorption and reradiation of ultraviolet synchrotron radiation by dust in others. Model calculations of compact sources are reviewed, emphasizing equipartition of energy, total energies, the importance of the Compton effect, and sources which present severe difficulties for the theory of a canonical incoherent electron-synchrotron source.

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