Cygnus A and Other 3CR Sources in Cosmological Tests
Guerra, Erick J. · Daly, Ruth A.
Original · EN
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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