Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phdt.........7g&link_type=abstract
Ph.D. Thesis Texas Univ., Austin.
Astronomy and Astrophysics
Astronomy
1
Classifications, Extragalactic Radio Sources, Low Frequencies, Error Analysis, Flux Density, Interferometers, Time Series Analysis, Wave Propagation
Scientific paper
The results of previous investigations aimed at detecting low radio frequency variability in extragalactic sources are examined to characterize the phenomenon and to compile a list of 64 known variables based on the criterion that there is at most a 0.1% chance that the observed fluctuations are due to random noise. The variability behavior of an additional 35 sources found during a survey conducted by the University of Texas Radio Astronomy Observatory (UTRAO) is analyzed. First the error estimates of the observable quantities are examined to make certain that the errors are not underestimated and so insure the validity of claims for variability. Sources suspected of varibility were observed at two frequencies at the VLA to obtain structures and spectral indices. This allows better models to be used in the reduction of UTRAO interferometer data to find flux density estimates at four epochs. The VLA information also allows the separation of the sources into those with steep spectral indices and those with flat spectral indices.
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