Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197.1097s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Dec. 1981, p. 1097-1101.
Astronomy and Astrophysics
Astronomy
11
Astronomical Spectroscopy, Extragalactic Radio Sources, Galactic Nuclei, Luminosity, Quasars, Relativistic Velocity, Angular Resolution, Collimation, Galactic Radio Waves, Radio Emission, Spectrum Analysis
Scientific paper
The spectral index-luminosity relationship for steep-spectrum cores in galaxies and quasars has been investigated, and it is found that the sample of galaxies supports earlier suggestions of a strong correlation, while there is weak evidence for a similar relationship for the quasars. It is shown that a strong spectral index-luminosity correlation can be used to set an upper limit to the velocities of the radio-emitting material which is expelled from the nucleus in the form of collimated beams or jets having relativistic bulk velocities. The data on cores in galaxies indicate that the Lorentz factors of the radiating material are less than about 2.
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