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Multiwavelength study of Cygnus A I. Precession and slow jet speeds from radio observations

By Katrien C. Steenbrugge and Katherine M. Blundell

Abstract

Cygnus A (3C 405), at a redshift of 0.05607 (Owen et al. 1997), is the closest powerful FR II classical double radio galaxy (see Fig. 1). At this distance, and for a Hubble constant of 73 km s −1 Mpc −1 (we also assume that ΩM = 0.3 and ΩΛ = 0.7), 1 ′ ′ corresponds t

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