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

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

2005-03-27

arxiv.org/abs/astro-ph/0503581v1

Astron.J.130:47-54,2005

Astronomy and Astrophysics

Astrophysics

41 pages, 7 figures, 2 tables, accepted AJ

Scientific paper

10.1086/430628

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.

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