Extragalactic radio sources - Rapid variability at 90 GHz

Astronomy and Astrophysics – Astronomy

Scientific paper

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Diurnal Variations, Extragalactic Radio Sources, Microwave Emission, Radiant Flux Density, Radio Astronomy, Variability, Ambient Temperature, Brightness Temperature, Correlation, Radio Telescopes, Temperature Dependence

Scientific paper

Thirty-three extragalactic variable radio sources have been observed at 90 GHz (3.3 mm) over two several-day-long periods in a search for daily and hourly variations. OV-236 (1921-29) showed a decrease in flux density by a factor of 2.7 over a three-day interval, recovering its previous flux density two days later. The other sources exhibited no significant variations above about 20%; a summary of previous radio observations of rapid variability is contained in the appendix.

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