Cosmic evolution of linear sizes and luminosity function of powerful radio galaxies - Is there a common cause?

Details Cosmic evolution of linear sizes and luminosity function of powerful radio galaxies - Is there a common cause? Cosmic evolution of linear sizes and luminosity function of powerful radio galaxies - Is there a common cause?

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..415g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 2, Aug. 1991, p. 415-418.

Statistics

Computation

8

Elliptical Galaxies, Galactic Evolution, Luminosity, Radio Emission, Radio Galaxies, Astronomical Models, Computational Astrophysics, Galactic Structure, X Ray Sources

Scientific paper

For the population of active elliptical galaxies associated with powerful double radio sources, it is proposed that the empirically derived brightening of their radio luminosity function (RLF) and the statistical decrease in their linear size at higher redshifts (up to about 1, or 2) could both arise if the hot gaseous halos seen to surround the ellipticals were denser at earlier epochs. The postulated density increase of the halo medium by about an order-of-magnitude between 0 and 1 would not just impart an extra stopping power needed to explain the smaller sizes of the double radio sources in the past but would, at the same time, enhance their efficiency for converting the beam power into radio emission by a factor which is quantitatively shown to be consistent with the empirically deduced evolution of the RLF up to z about 1. It seems thus possible to envision a unified framework for understanding the physical origin of these two well-known cosmological trends displayed by powerful radio galaxies.

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