Cosmology with redshift surveys of radio sources

Rawlings, Steve, Blundell, Katherine M., Lacy, Mark, Willott, Chris J. and Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X 1998. Cosmology with redshift surveys of radio sources. Presented at: Observational Cosmology with the New Radio Surveys, Tenerife, Canary Islands, 13–15 January 1997. Published in: Bremer, M. N., Jackson, N. and Pérez-Fournon, I. eds. Observational cosmology with the new radio surveys: Proceedings of a workshop held in Puerto de la Cruz, Tenerife, Canary Islands, Spain, 13–15 January 1997. Astrophysics and Space Science Library (226) Dordrecht: Springer Netherlands, pp. 171-178. 10.1007/978-94-011-5238-9_30

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Abstract

We use the K - z relation for radio galaxies to illustrate why it has proved difficult to obtain definitive cosmological results from studies based entirely on catalogues of the brightest radio sources, e.g. 3C. To improve on this situation we have been undertaking redshift surveys of complete samples drawn from the fainter 6C and 7C radio catalogues. We describe these surveys, and illustrate the new studies they are allowing. We also discuss our ‘filtered’ 6C redshift surveys: these have led to the discovery of a radio galaxy at z = 4.4, and are sensitive to similar objects at higher redshift provided the space density of these objects, p, is not declining too rapidly with z. There is currently no direct evidence for a sharp decline in the ρ of radio galaxies for z > 4, a result only barely consistent with the observed decline of flat-spectrum radio quasars.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Springer Netherlands
ISBN:	9789401062053
Last Modified:	24 Oct 2022 11:34
URI:	https://orca.cardiff.ac.uk/id/eprint/48566

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