Variability of the low-frequency radio emission of the quasar 3C 345

Details Variability of the low-frequency radio emission of the quasar 3C 345 Variability of the low-frequency radio emission of the quasar 3C 345

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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