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EXTENDED RADIO SOURCES EVOLUTION AND THE ANGULAR SIZE REDSHIFT RELATION

J. C. CARVALHO

Departamento de Física – UFRN, Caixa Postal 1661, 59072-970 Natal – RN, Brazil

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J. S. ALCANIZ

Observatório Nacional, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro – RJ, Brazil

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, and

J. A. S. LIMA

Instituto de Astronomia, Geofísica e Ciências Atmosféricas, USP, 05508-900 São Paulo, SP, Brazil

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https://doi.org/10.1142/S0218271807010171Cited by:0 (Source: Crossref)

Abstract

The angular diameter versus redshift relation in the standard FRW model is rediscussed. The present data imply that the standard FRW flat cosmology (q₀ = 1/2) cannot be the best-fit model when evolution is absent. By using a simple analytical model to describe the expansion of jets in extended radio sources, a redshift dependence of the proper length of the sources is obtained. For these sources, we show that evolution contributes in such a way that the models can be compatible with the observations of the angular diameter versus redshift cosmological test.

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