Long term variability of radiosources in the frequencies of 22 GHz and 44 GHz

Details Long term variability of radiosources in the frequencies of 22 GHz and 44 GHz Long term variability of radiosources in the frequencies of 22 GHz and 44 GHz

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8719549b&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Galactic Structure, Radio Sources (Astronomy), Variability, Mapping, Quasars, Radio Telescopes, Very Long Base Interferometry

Scientific paper

The radio sources 3C273, OV236, Cen A and Sgr A were observed during a period of six years (1980 to 1986) in the frequencies of 22 GHz and 44 GHz with the Itapetinga radiotelescope (Brazil). The objective was the detection of variability in the intensity and in the shape of the spectra of the sources. All presented some variability, specially the quasar 3C273, which after a period of intense activity (1981 to 1985), returned to its quiescent level at the end of 1985. The increase of the flux density in these frequencies is associated with ejection of new components by the central source in the quasar, as observed in maps obtained by VLBI techniques.

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