Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..531l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, April 1, 1987, p. 531-550.
Astronomy and Astrophysics
Astronomy
62
Astronomical Photometry, Galactic Clusters, Radio Galaxies, Surface Properties, Visible Spectrum, Charge Coupled Devices, Galactic Nuclei, Galactic Structure, Southern Hemisphere
Scientific paper
The magnitudes and values of the structural parameter alpha of a sample of 31 powerful radio galaxies in the Southern Hemisphere are obtained from CCD images. It is found that radio galaxies with FR I structure and/or weak emission lines are similar to first-ranked Abell cluster galaxies, while the more powerful radio galaxies with FR II structure and stronger emission lines have lower optical luminosities. Generally lower optical luminosities are also found for the underlying galaxies in the broad-line radio galaxies with substantial unresolved nuclear components. The total absolute magnitudes of the radio galaxies are shown to be correlated with cluster density, and the incidence of multiple nuclei is a strong function of environment.
Lilly Simon J.
Prestage Richard M.
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