Cygnus A and Other 3CR Sources in Cosmological Tests

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 r...

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Bibliographic Details
Published inarXiv.org
Main Authors Guerra, Erick J, Daly, Ruth A
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.06.1995
Subjects
Parameters
Radio galaxies
Red shift
Universe
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Summary: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.
ISSN:2331-8422