The linear size evolution of extragalactic radio sources revisited

Details The linear size evolution of extragalactic radio sources revisited The linear size evolution of extragalactic radio sources revisited

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.162..343o&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 162, no. 2, Dec. 1989, p. 343-347.

Astronomy and Astrophysics

Astrophysics

8

Extragalactic Radio Sources, Quasars, Radio Galaxies, Radio Spectra, Red Shift, Line Of Sight, Stellar Spectra, Universe

Scientific paper

The median angular sizes in different redshift bins were plotted as a function of (1 + z) for bright steep spectrum radio galaxies and quasars, both together and separately. These were compared to the theoretical curves for an Euclidean universe, and for a Friedmann universe with linear size evolution of the form l equal to about (1 + z) exp (-x) with x = 3. It was found that, for the sources as a whole, the variation of angular diameter with redshift behaved as expected in an Euclidean universe, which can also correspond to a Friedmann universe with linear size evolution and x values between 1 and z.

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