A direct determination of linear-size evolution of elliptical radio galaxies

Details A direct determination of linear-size evolution of elliptical radio galaxies A direct determination of linear-size evolution of elliptical radio galaxies

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.328..500o&link_type=abstract

Nature (ISSN 0028-0836), vol. 328, Aug. 6, 1987, p. 500, 501. ZWO-supported research.

Mathematics

Logic

43

Astronomical Models, Elliptical Galaxies, Galactic Evolution, Galactic Structure, Radio Galaxies, Active Galactic Nuclei, Radiant Flux Density, Red Shift, Size Determination

Scientific paper

A redshift dependence of the maximum distance out to which AGN can transport their relativistic particles, a distance on average smaller in the past than it is at present, was found for radio quasars by Miley (1971). Kapahi (1975) showed that the radio galaxy population probably shares this property with the extended radio quasars. Here, samples of radio elliptical galaxies complete to vastly different flux limits are used for the first time to separate redshift and luminosity dependences of the galaxies' linear sizes. Ram pressure in a medium with cosmologically varying density will naturally cause a dependence on redshift, but this cannot explain the steepness of the dependence implied here.

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