Extragalactic radio source evolution under the dual-population unification scheme
Aug, 199818 pages
Published in:
- Mon.Not.Roy.Astron.Soc. 304 (1999) 160-174
e-Print:
- astro-ph/9808054 [astro-ph]
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Abstract: (arXiv)
We show that a dual-population unification scheme provides a successful paradigm with which to describe the evolution and beaming of all bright extragalactic radio sources. The paradigm consists of two intrinsic radio-source populations, based on the two distinct radio-galaxy morphologies of Fanaroff-Riley classes I and II. These represent the `unbeamed' or `side-on' parent populations of steep radio spectra: the `beamed' source types including flat-spectrum quasars and BL Lac objects, arise through the random alignment of their radio-axis to our line-of-sight where Doppler-beaming of the relativistic radio jets produces highly anisotropic radio emission.References(57)
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