The expansion and cosmological evolution of powerful radio sources

Details The expansion and cosmological evolution of powerful radio sources The expansion and cosmological evolution of powerful radio sources

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..531g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 1, 1987, p. 531-542. Research supported by th

Astronomy and Astrophysics

Astronomy

54

Beams (Radiation), Cosmology, Extragalactic Radio Sources, Galactic Radio Waves, Radio Transmission, Halos, Intergalactic Media, Radio Jets (Astronomy), Red Shift, X Ray Sources

Scientific paper

A simple analytical model is formulated to study beam dynamics in powerful extragalactic radio sources. Two phases are considered for the beam propagation: first through the gaseous halo of the parent galaxy, and then through a much hotter intergalactic medium (IGM). These two media are conceived to be pressure-matched at their interface, which is expected to move closer to the parent galaxy with increasing redshift, owing to a steeply rising IGM pressure. It is argued that the advance of the beam can be ignored quantitatively (notwithstanding a continuing nuclear activity) once its rate has become subsonic relative to the ambient medium. For the input parameters to the model typical values for a powerful radio source, its associated X-ray emitting halo, and the IGM are adopted, and it is shown that the model can explain in a fairly natural way the observed linear sizes of the sources at small redshifts and also their cosmological evolution. The possible relevance of the model to the reported prevalence of subgalactic-sized sources at very high redshifts (z greater than about 2) is also discussed.

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