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Is PKS1921 – 29 a quasar with correlated radio and optical variations?

Abstract

Although many quasars and related objects are variable at both optical and radio frequencies, the relationship, if any, between these variations is unclear. In particular, only three objects, OJ287 (ref. 1), 0235 + 164 (ref. 2) and 0420 – 01 (ref. 3), have shown well correlated radio–optical variability. The first two are BL Lac objects and showed little or no time delay between the radio and optical variations. The last object is a quasar, and underwent a radio flare some 2 years after a significant optical outburst. Optical observations of another quasar, PKS1921 – 29, which may also show correlated radio and optical variability are reported here.

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