Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-27
NewAstron.Rev.47:225-229,2003
Astronomy and Astrophysics
Astrophysics
LaTeX, 6 pages, 1 fig: Elsevier science format - NAR. Proceedings of the workshop "Radio galaxies: past, present & future". ed
Scientific paper
10.1016/S1387-6473(03)00030-7
The presence of two distant FR I radio galaxies in the Hubble Deep Field plus Flanking Fields indicates that the number density of these objects is about 10-50 times higher at z>1 than in the local universe. This is in strong contrast with the idea that FR Is undergo no cosmological evolution. We advocate that the cosmological evolution of radio sources may be independent of FR class, and instead solely a function of radio power. In this scenario the evolutionary properties of extragalactic radio sources can be fully described within a `single population scheme'.
Best Philip
Snellen Ignas
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