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The spectral index-luminosity relationship for steep-spectrum cores in extra-galactic radio-sources

Saikia, DJ (1981) The spectral index-luminosity relationship for steep-spectrum cores in extra-galactic radio-sources. In: Monthly Notices of the Royal Astronomical Society, 197 (3). pp. 1097-1101.

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Official URL: http://adsabs.harvard.edu/abs/1981MNRAS.197.1097S

Abstract

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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Department/Centre: Others
Date Deposited: 16 Feb 2012 05:17
Last Modified: 16 Feb 2012 05:17
URI: http://eprints.iisc.ernet.in/id/eprint/43335

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