The Cluster of Galaxies Surrounding Cygnus A II: New Velocities and a Dynamical Model

Abstract

We have spectroscopically identified 77 new members of the Cygnus A cluster, bringing the total to 118 galaxies consistent with cluster membership. We use these data combined with the results from X-rays to deduce a dynamical model for the system. The data are consistent with a cluster-cluster merger viewed at a projection angle of 30-45 degrees, 0.2-0.6 Gyr prior to core passage. We estimate the richness of the combined cluster system at Abell richness class 2 or greater, suggesting the merger of two richness class 1 clusters.

arXiv comment41 pages, 7 figures, 2 tables, accepted AJ

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Cited by in corpus (10)

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• Modeling the Infrared Emission in Cygnus A
• Multiwavelength study of Cygnus A I. Precession and slow jet speeds from radio observations
• Low-power radio galaxy environments in the Subaru/XMM-Newton Deep Field at z~0.5
• Merger Shocks in Abell 3667 and the Cygnus~A Cluster
• Simulations of the merging cluster of galaxies Cygnus A
• Astrophysics in 2005
• Radio Source Heating in the ICM: The Example of Cygnus A
• Multiwavelength study of Cygnus A IV. Proper motion and location of the nucleus