Observational study of variability of extragalactic radio sources.

Details Observational study of variability of extragalactic radio sources. Observational study of variability of extragalactic radio sources.

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pabei..13..249s&link_type=abstract

Prog. Astron., Vol. 13, No. 3, p. 249 - 268

Astronomy and Astrophysics

Astrophysics

Radio Sources: Variability, Radio Sources: Extragalactic, Radio Sources: Vlb Interferometry

Scientific paper

The observational progress in the study of the variability of extragalactic radio sources is reviewed. First, some concise nomenclature and definitions are introduced of several variable radio sources. Then, the results from various measurements of variability (such as variations of flux, spectra and polarization) over a wide frequency range (radio, infrared, optical, ultraviolet, X-ray and γ-ray) are presented. The impact of VLBI on the study of the variability is also discussed. As an introduction to the theoretical work, a short description of the inverse Compton catastrophe induced by short time-scale variation is given. Finally, the importance is emphasized of simultaneous multi-frequency campaigns, in the widening and deepening of our knowledge about active galactic nuclei.

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