The Cluster of Galaxies Surrounding Cygnus A. II. New Velocities and a Dynamic Model | Zendy

Michael J. Ledlow | Zendy; F. N. Owen | Zendy; Neal A. Miller | Zendy

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The Cluster of Galaxies Surrounding Cygnus A. II. New Velocities and a Dynamic Model

Author(s) -

Michael J. Ledlow,

F. N. Owen,

Neal A. Miller

Publication year - 2005

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/430628

Subject(s) - cluster (spacecraft) , astrophysics , physics , galaxy cluster , brightest cluster galaxy , projection (relational algebra) , species richness , galaxy , astronomy , core (optical fiber) , computer science , geology , optics , paleontology , algorithm , programming language

We have spectroscopically identified 77 new members of the Cygnus A cluster,bringing the total to 118 galaxies consistent with cluster membership. We usethese data combined with the results from X-rays to deduce a dynamical modelfor the system. The data are consistent with a cluster-cluster merger viewed ata projection angle of 30-45 degrees, 0.2-0.6 Gyr prior to core passage. Weestimate the richness of the combined cluster system at Abell richness class 2or greater, suggesting the merger of two richness class 1 clusters.Comment: 41 pages, 7 figures, 2 tables, accepted A

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