Multi-frequency radio observations of compact extragalactic sources: Time variability and correlation with optical variations

Details Multi-frequency radio observations of compact extragalactic sources: Time variability and correlation with optical variations Multi-frequency radio observations of compact extragalactic sources: Time variability and correlation with optical variations

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........6b&link_type=abstract

Ph.D. Thesis Massachusetts Univ., Amherst.

Computer Science

41

Extragalactic Radio Sources, Flux Density, Stellar Evolution, Correlation, Radio Emission, Time Lag, Variability

Scientific paper

In order to investigate the evolution of compact extragalactic radio sources, three observing programs were undertaken. These programs were: single epoch spectra for 113 sources compiled from near simultaneous observations at seven frequencies (between 1.4 and 90 GHz); monthly observations were conducted at lambda 3 mm to search for short timescale variations; and radio (15.5 GHz) and optical variations in 45 sources were searched for correlated activity. The observed radio spectra are the first compilation of near simultaneous observations of this sample of regularly monitored variable sources. These sources exhibit a wide range of variability and spectral characteristics, thus constituting a useful sampler for comparison with theoretical models for radio emission mechanisms. The high frequency radio observations of varible extragalactic radio sources are important for studying the evolution of flux density outbursts, which are affected at lower frequencies by opacity effects and expansion processes.

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