Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..669w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 196, P. 669, 1981
Astronomy and Astrophysics
Astronomy
32
Scientific paper
The relations between the optical and radio properties of a sample of 4C radio galaxies of intermediate radio luminosity have been investigated. Optical spectra were taken with the Hale 5-m telescope and radio maps of a subset of the galaxies were made with the Cambridge 1-mile and 5-km telescopes.
The optical activity of the nuclear region was characterized by the strength of the emission lines and by the luminosity of the non-thermal component obtained from a decomposition of the optical continuum into a non-thermal power law and the spectrum of a giant elliptical galaxy. The percentage of sources showing strong emission features is markedly less than for high- luminosity objects. The radio morphology appears to be closely related to the degree of optical activity, in that classical double sources have high activity whereas complex radio sources show little or no activity. Thus these data extend to lower radio luminosities the correlation found in high-luminosity samples.
This correlation is discussed in terms of (1) an intrinsic relationship between the energy spectrum of the relativistic electrons in the nucleus and the optical and radio properties of the galaxy, and (2) the modifications of this relationship due to the motion of the galaxy through the intergalactic medium.
Hine R. G.
Sargent Wallace L. W.
Wilkinson Althea
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