Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.228..195u&link_type=abstract
Astrophysics and Space Science, v. 228, Proceedings of the fourth United Nations/European Space Agency Workshop, Cairo, Egypt, 2
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
The implications of the intrinsic luminosity evolution with cosmological epoch on the value of the density parameter (?) and evolution of radio sizes of extragalactic radio sources have been considered. It is shown that a power law evolution model of the sortP ˜ (1 +z) β can be used to contrain the value of ?. In the presence of a strong luminosity evolution, the model yields an upper limit of ? ˜ 0.5. It is also shown that the angular diameter redshift (θ z) relation for quasars can be interpreted in terms of the assumed luminosity evolution combined with a luminosity-linear size correlation with little or no linear size evolution required. On the other hand, strong linear size evolution is needed to explain theθ z data for radio galaxies independent of luminosity.
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