Radio observations of luminosity and flux-matched samples of quasi stellar objects

Details Radio observations of luminosity and flux-matched samples of quasi stellar objects Radio observations of luminosity and flux-matched samples of quasi stellar objects

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........3n&link_type=abstract

Ph.D. Thesis Virginia Univ., Charlottesville.

Astronomy and Astrophysics

Astronomy

9

Luminosity, Quasars, Radio Astronomy, Red Shift, Flux (Rate), Hubble Diagram, Magnetic Fields, Very Long Base Interferometry

Scientific paper

The VLA and the U.S. VLBI network were used to study 60 radio-loud quasars which were divided by redshift into three groups in such a way that comparisons were possible between two luminosity-independent samples and two flux-independent samples. The low redshift, low luminosity sample was found to differ more from the medium and high redshift groups than the latter two were found to differ from one another. Source properties that correlate with redshift include both angular and linear size, core dominance, and magnetic field density. Corrections for non-uniform optical depths and for Malmquist bias yield a plausible Hubble diagram that is consistent with qo of 0.2 (although values as large as 1.0 cannot be excluded) and that indicates steep evolution in quasar brightness. A large fraction of the low luminosity, low redshift (z 1.0) quasars were found to contain jets that are similar to those seen in nearby bright radio galaxies. There is poor agreement between the VLA structure and the VLBI structure when the latter is observed. Implications for various radio source models are discussed.

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