No evidence for a `redshift cut-off' for the most powerful classical double radio sources

Details No evidence for a `redshift cut-off' for the most powerful classical double radio sources No evidence for a `redshift cut-off' for the most powerful classical double radio sources

1999-08-10

arxiv.org/abs/astro-ph/9908106v1

Astronomy and Astrophysics

Astrophysics

To appear in `The Hy-redshift universe: Galaxy formation and evolution at high redshift' eds. A.J. Bunker and W.J.M. van Breug

Scientific paper

We use three samples (3CRR, 6CE and 6C*) to investigate the radio luminosity function (RLF) for the `most powerful' low-frequency selected radio sources. We find that the data are well fitted by a model with a constant co-moving space density at high redshift as well as by one with a declining co-moving space density above some particular redshift. This behaviour is very similar to that inferred for steep-spectrum radio quasars by Willott et al (1998) in line with the expectations of Unified Schemes. We conclude that there is as yet no evidence for a `redshift cut-off' in the co-moving space densities of powerful classical double radio sources, and rule out a cut-off at z < 2.5.

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