Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19..108m&link_type=abstract
Astronomy Letters, Vol. 19, p. 108-109; Pis'ma v Astronomicheskij Zhurnal (ISSN 0320-0108), vol. 19, no. 4, p. 291-294. In Russ
Astronomy and Astrophysics
Astronomy
1
Brightness Temperature, Extragalactic Radio Sources, Frequency Stability, Quasars, Ultraviolet Radiation, Low Frequencies, Radio Astronomy, Variability, Very Long Base Interferometry
Scientific paper
It is shown that the LF variability of the quasar 3C 345 is determined by changes in the absorption of the ionized medium surrounding the nucleus. The degree of the medium's ionization varies as a function of the UV emission level. The recombination time of the medium corresponds to the typical time of the LF variability. The brightness temperature of the compact component is approximately equal to or less than 10 exp 12 K, and the size (the visible part of the jet closest to the nucleus) depends on the transparency of the ambient medium.
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