On the redshift-apparent diameter relation for radio sources

Details On the redshift-apparent diameter relation for radio sources On the redshift-apparent diameter relation for radio sources

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..321g&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 3, Sept. 1977, p. 321-325.

Astronomy and Astrophysics

Astronomy

7

Cosmology, Quasars, Radio Galaxies, Radio Sources (Astronomy), Red Shift, Astrometry, Astronomical Models, Diameters, Galactic Evolution, Size Determination

Scientific paper

The redshift-apparent diameter (theta - z) relation for radio galaxies is extended to z of about 1.2 and compared with the same relation for quasars. It is shown that the two theta - z relations are identical and that the metric-diameter distributions of quasars and radio galaxies are also identical, if the quasar redshift is cosmological. The theta - z relation for radio sources in general is shown to be in conflict with the standard curves expected in Friedmann models, thus implying cosmological evolution for the source metric diameters. A possible discontinuity in such evolution at z of approximately 0.5 is briefly discussed.

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