Observations of variable radio sources in the 300 to 1000 MHz range

Details Observations of variable radio sources in the 300 to 1000 MHz range Observations of variable radio sources in the 300 to 1000 MHz range

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..884f&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Dec. 15, 1980, p. 884-893.

Astronomy and Astrophysics

Astronomy

27

Brightness Temperature, Decimeter Waves, Radiant Flux Density, Radio Sources (Astronomy), Variability, Bl Lacertae Objects, Data Reduction, Radiometers, Synchrotron Radiation, Very Long Base Interferometry

Scientific paper

Of 52 radio sources observed at six frequencies between 321 and 920 MHz, the flux densities of seven were seen to be definitely variable, and five other sources were probably variable. The variable portion of the flux densities were nearly constant over the frequency range, and source strengths appeared to increase simultaneously with sample intervals of 2-6 months. Using source sizes observed with VLBI techniques, the brightness temperatures of the variable components of the radiation are less than one-trillion K, but the time scales of the variations imply much smaller source sizes and, hence, much higher brightness temperatures.

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