Giant radio galaxies

Details Giant radio galaxies Giant radio galaxies

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sciam.233...26s&link_type=abstract

Scientific American, vol. 233, Aug. 1975, p. 26-35.

Astronomy and Astrophysics

Astronomy

4

Astronomical Maps, Galactic Structure, Radio Galaxies, Radio Telescopes, Astronomical Photography, Cygnus Constellation, Galactic Nuclei, Morphology, Radio Astronomy, Relief Maps

Scientific paper

The developments of the past 30 years which led to instruments such as the powerful radio telescope at Westerbork are reviewed. Discoveries such as Cygnus A changed radio astronomy into a most important tool of observational cosmology. Other radio galaxies discussed include DA 240, 3C 129, 3C 236, NGC 1265 and NGC 1275. The problems presented by these giant radio galaxies are analyzed. Theoretical models are suggested that assume that every radio component carries its own supply of energy and the energy might be stored in turbulent irregular motions of the hot gas permeating each radio source. Other models discussed include puffing radio galaxy and the magnetospheric model. Ram pressure is one mechanism suggested as the cause of the confined appearance of the gaseous components of double radio galaxies. The study of the double structure of radio galaxies extends into the unknown territory of the dense galactic nuclei, for whose exploration radio interferometers, extending almost the full diameter of the earth, are now combining forces with the largest optical telescopes.

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