Is PKS1921-29 a quasar with correlated radio and optical variations

Details Is PKS1921-29 a quasar with correlated radio and optical variations Is PKS1921-29 a quasar with correlated radio and optical variations

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..612g&link_type=abstract

Nature, vol. 287, Oct. 16, 1980, p. 612, 613.

Astronomy and Astrophysics

Astronomy

7

Light (Visible Radiation), Periodic Variations, Quasars, Radio Astronomy, Stellar Spectrophotometry, Spectral Correlation, Visual Photometry

Scientific paper

Optical observations of the quasar PKS 1921-29, a possible candidate object for correlated optical and radio variability, are reported. Photometry of the quasar was obtained at an effective wavelength of 550 nm from mid-1975 to 1980, and is compared with radio data for the same period. Optical data reveal a large flare beginning near 1977.4, lesser-amplitude activity in 1978 and a bright state in 1979, with the object fainter and showing less activity from 1974-1977. The increase in optical variability is found to coincide with increasing high-frequency variability, particularly in the case of the optical burst at 1977.4 which began near the maximum of radio activity. It is noted that similar behavior has been observed in the BL Lac object AO 0253+164.

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