Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982afz....18..245g&link_type=abstract
(Astrofizika, vol. 18, Apr.-June 1982, p. 245-254.) Astrophysics, vol. 18, no. 2, Oct. 1982, p. 150-156. Translation.
Astronomy and Astrophysics
Astrophysics
1
Extragalactic Radio Sources, Galactic Evolution, Galactic Radiation, Galactic Structure, Light (Visible Radiation), Periodic Variations, Amplitude Distribution Analysis, Red Shift
Scientific paper
The amplitude of the optical variability, which is taken as a measure of the activity of an extragalactic object, and the size of the associated radio sources, which gives an indication of its age, are compared for a number of extragalactic objects. The maximal reliably fixed amplitude of the variations of the light is taken as an index of optical activity, and the linear size is obtained by a described procedure. A characteristic two-peak pattern is found for the dependence of the amplitude of optical variability on linear dimension, and it is argued that this represents a recurrence of activity and is not the result of two objects of different natures. The velocities of ejected radio components are discussed, and it is concluded from the heights of the peaks that the activity gradually decreases after it starts.
Gagen-Torn V. A.
Shevchenko Ivan I.
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