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Cygnus A and Other 3CR Sources in Cosmological Tests

Erick J. Guerra·Ruth A. Daly
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Abstract

Powerful extended radio galaxies like Cygnus A can be used for cosmological tests. The characteristic, time-independent length $D_*$ for several radio sources is calculated and compared to the average physical length for a sample of radio galaxies. The ratio of these two lengths as a function of redshift is used to constrain cosmological parameters. Cygnus A is the only low-redshift ($z<0.5$) radio galaxy for which we have an estimate for $D_*$. We comment on the sensitivity to this one low-redshift point, and results including and excluding Cygnus A are shown. A low density universe is favored, and the one free model parameter is relatively well constrained.

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Erick J. Guerra, Ruth A. Daly. 1995-06-12. Cygnus A and Other 3CR Sources in Cosmological Tests. https://arxiv.org/abs/astro-ph/9506078

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