Testing the angular-size versus redshift relation with compact radio sources

Astronomy and Astrophysics – Astronomy

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Galaxies: Jets, Cosmology: Observations, Distance Scale

Scientific paper

Recently Kellermann has presented evidence in favour of the Universe being at critical density (q_0=0.5), based upon the angular-diameter (theta) versus redshift (z) relation for a sample of 82 milliarcsecond radio sources. Relativistic beaming is important in such sources and therefore any flux-limited sample of them has a projected-size distribution that is biased. Here we investigate the effects of flux selection on the value of q_0 derived using the theta-z method, and show that it can lead to a large shift in the implied value of q_0. Using the subset of those 59 sources from Kellermann for which information is available to us, we find that no useful bounds on the value of q_0 can be derived. Finally, we carry out simulations to estimate the number of milliarcsecond sources needed to constrain q_0 with reasonable error and comment upon the likelihood of such a sample being available in the forseeable future.

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