Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997conph..38..409d&link_type=abstract
Contemporary Physics, Vol. 38, No. 6, p. 409 - 427
Mathematics
Logic
Cosmological Models, Universe: Evolution
Scientific paper
Radio galaxies and quasars provide unique physical laboratories for the study of extremes in physics such as highly-relativistic motion and relativistic gravity. These sources are also of more general interest for understanding the formation and evolution of the Universe of "normal" galaxies. The author explains how 50 years of increasingly sophisticated observations coupled with the application of standard physics has led to the current "unified model". He describes current observational efforts to identify precisely how these sources are triggered into action, and how such fuelling mechanisms might relate to the fact that radio galaxies and quasars were much more numerous in the young Universe than they are today. Finally, he explains how these high-energy objects can be used as cosmic beacons to locate very distant galaxies and hence enable the formation and evolution of galaxies of stars to be studied back to within 1 billion years of the Big Bang, and how the cosmological evolution of radio galaxies and quasars may be closely related to the overall star-formation history of our Universe.
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