Expansion speeds in extended extragalactic double radio sources from angular structure

Details Expansion speeds in extended extragalactic double radio sources from angular structure Expansion speeds in extended extragalactic double radio sources from angular structure

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..112b&link_type=abstract

Astronomy and Astrophysics, vol. 84, no. 1-2, Apr. 1980, p. 112-114.

Astronomy and Astrophysics

Astrophysics

37

Extragalactic Radio Sources, Galactic Evolution, Mathematical Models, Density Distribution, Expansion, Flux Density, Radio Galaxies

Scientific paper

It is shown that the distribution of the expansion speed 'v' of the components of extragalactic double radio sources can be analytically derived from that of the fractional difference x between the arms of the double. Assuming symmetric evolution of the components at constant speed v, the distributions p(v) and g(x) are related by p(v)=-vg(v) in which v is measured in units of c. p(v) is derived from g(x) for three subsamples of the 166 3CR sources and implies that about half of the double sources have v between 0.1c and 0.4c, which is appreciably higher than Mackay's (1973) upper limit of 0.08c derived from the width of flux density ratio distribution.

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