Mathematics – Logic
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.188..111h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 188, July 1979, p. 111-130.
Mathematics
Logic
164
Galactic Radiation, Optical Emission Spectroscopy, Radio Galaxies, Red Shift, Astronomical Spectroscopy, Light Emission, Luminous Intensity, Radio Emission, Seyfert Galaxies
Scientific paper
A statistically defined sample of 3CR radio galaxies complete to a flux density of 10 Jy at 178 MHz is analyzed. The results confirm that there is a correlation between redshift and the presence of strong emission lines in the optical spectra of radio galaxies and that selection effects have little influence on this correlation. The relation between the compact central components of extended sources and the optical spectral classes of the radio galaxies is examined. It is suggested that the central components of class A radio galaxies are more luminous than those of class B radio galaxies because the class A sources are, as a whole, stronger radio emitters at larger distances. Investigation of the radio morphological types reveals that class A radio galaxies are almost exclusively associated with powerful classical double sources, while the class B galaxies can be associated with all types of radio source. The optical and spectroscopic properties of radio galaxies and Seyfert galaxies are compared.
Hine R. G.
Longair Malcolm S.
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